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A Scientific Commentary on Genesis 7:11

Rolf Bouma — Tue, 05 Feb 13 08:00:43 -0800

Genesis 7:11: In the six hundredth year of Noah's life, in the second month, on the seventeenth day of the month, on that day all the fountains of the great deep burst forth, and the windows of the heavens were opened.

Genesis 8:1: But God remembered Noah and all the wild animals and all the domestic animals that were with him in the ark. And God made a wind blow over the earth, and the waters subsided; 2 the fountains of the deep and the windows of the heavens were closed, the rain from the heavens was restrained, 3 and the waters gradually receded from the earth.

The Flood narrative of Genesis 7-9 has played a prominent role in science and religion debates for over three hundred years and gave rise in earlier centuries to geological theories such as old earth catastrophism. While literary studies have uncovered the chiastic structure of the Flood story (see Gordon Wenham, “The Coherence of the Flood Narrative” Vetus Testamentum 28 (1978):336-48) and with it the theological pivot point of the entire narrative (Gen. 8:1 – “And God remembered Noah…), much of the popular attention remains on the questions regarding details (Is there THAT much water in the world to cover ALL the mountains to a depth of 15 cubits? Could you really fit two or seven of every animal species in an ark that size?)

Looking at a smaller matter, we find at the beginning and the middle of the narrative indications of an ancient Near Eastern worldview. As the story is told, the flood was not merely the result of excessive rain, but actually the convergence of the waters above the earth with the waters below the earth. It is, as one translation puts it, as if the sluice gates at the deep and of the heavens were thrown open and water poured in from above and below. This is a consistent picture from the Old Testament of a three-tiered universe—a dome above the earth holding back the heavenly waters, a flat earth with water on its surface, and water under an earth which is held up by pillars.

That the story is told using the cosmology of its time should not be unduly unsettling, nor that the story is reinterpreted as new understandings of the universe come into favor. By way of example, consider John Calvin and his understanding of the structure of the universe. Although committed to the principle of sola Scriptura, Calvin recognized that the Bible would have been written in terms its original recipients would have understood.

Calvin inherited the medieval cosmology of his time, a way of viewing the world heavily influenced by Greek thought and one which was about to receive shocks from astronomers such as Copernicus and Galileo. But not just yet. Calvin still subscribed to the common conception of his day in which the four elements—earth, air, fire, and water—comprised the earthly sphere and possessed unique characteristics. The nature of air and fire was to rise, while the nature of earth and water is to sink. Earth, being heavier than water, should sink to the center of the cosmos and water should compose the next layer. Both earth and water are spherical, i.e., naturally form spherically around the cosmic center. Thus the heavier spherical element of earth should be encased entirely within the lighter spherical element of water.

Notice what this does to the flood story. For Calvin, the amazing thing is that the world isn’t constantly under water and subject to flooding. In the cosmology of Calvin’s day, it does not take an act of God to cause a universal flood, but rather an actively present and restraining hand of God to keep the waters back in everyday circumstances and make inundation by water something other than universal.

Obviously, Calvin was wrong. Or perhaps we should say that medieval cosmology was flawed and justifiably gave way to new conceptions of the universe. The answer is not to return to an ancient Near Eastern cosmology, but to reinterpret cautiously within new and better cosmologies and to pay closest attention to the text and the theology of scripture.

The geological and planetary sciences bring their own unique contributions and are of more interest than the latest expedition to discover the ark on Mt. Ararat. Is the flood story a universalization of a catastrophic regional event that burned itself into the psyche of ancient cultures in the Mediterranean basin? Various theories regarding a Black Sea venue for a catastrophic flood event are still in process of being sorted out. It’s intriguing. Or the question where the water on Planet Earth comes from? Was it always here as an emanation of vapors from the earth’s crust in its early formation, or has it accumulated over eons through the steady bombardment of earth by small, icy comets? It’s an intriguing scientific question that is in the midst of determination through testing.

Preaching Suggestions

When preaching on the story of the Flood, it is easy to get lost in the debates over particulars. As mentioned elsewhere, to tackle all the peripheral issues threatens to turn a sermon into a geology lecture. Other settings are better suited to addressing those questions, and those are best addressed open-endedly.

A brief explanation of ancient Near Eastern cosmology can be helpful to contextualize the story. If there are those who are tempted to think that a cosmology embedded in the Bible must be inspired and definitive, one can note that cosmology has changed by the New Testament. The Bible itself isn’t wed to a particular structure of the universe.

What is important is to keep the theology of the text front and center, and in that theology there are at least three non-negotiables from the flood narrative. First, human sin and violence threatens to undo a good creation (the flood is a de-creation event, a return of the waters mentioned in Genesis 1:2). Second, God remembers Noah, and never forgets his promises. Third, the end of the flood is a covenant with the whole earth regarding the stability and endurance of the natural order.

Series: It's an Old World After All

Joy Walters — Tue, 06 Nov 12 07:00:44 -0800

In our last Videocast, we explored some of the ways scientists have been able to determine the age of hominid fossils. Today, in our sixth BioLogos videocast, we extend the question to the age of the Earth. The first section, featured today, explains four methods scientists have used to determine that age: tree ring, lake varve, radiometric, and seafloor spread dating.

The script was written by biology student Joy Walters, with help from BioLogos president Darrel Falk.

How Do We Know the Earth is Old? (Infographic)

Sun, 15 Jul 12 04:59:59 -0700

(Click image for full resolution)

The Questions Update: The Age of the Earth

Sat, 14 Jul 12 05:02:55 -0700

How are the ages of the Earth and universe calculated?

In a Nutshell

Many independent measurements have established that the Earth and the universe are billions of years old. Geologists have found annual layers in glaciers that can be counted back 740,000 years. Using the known rate of change in radio-active elements (radiometric dating), some Earth rocks have been shown to be billions of years old, while the oldest solar system rocks are dated at 4.6 billion years. Astronomers use the distance to galaxies and the speed of light to calculate that the light has been traveling for billions of years. The expansion of the universe gives an age for the universe as a whole: 13.7 billion years old.

In Detail

Introduction

Astronomers and geologists have determined that the universe and Earth are billions of years old. This conclusion is not based on just one measurement or one calculation, but on many types of evidence. Here we will describe just two types of evidence for an old Earth and two types of evidence for an old universe; more types can be found under Further Reading. These methods are largely independent of each other, based on separate observations and arguments, yet all point to a history much longer than 10,000 years. As Christians, we believe that God created the world and that the world declares his glory, so we can’t ignore what nature is telling us about its history.

Age of the Earth from seasonal rings and layers

If you’ve ever seen a horizontal slice of a tree trunk, you’ve seen how a tree forms a new growth ring each year. In years of drought, the tree grows less quickly so the ring is narrower; in good growing seasons the ring is thicker. A tree’s age can be found by simply counting its rings. By comparing the pattern of thick and thin rings to weather records, scientists can verify that the method is accurate. This method can even be used on dead trees that fell in a forest long ago. For example, the last 200 rings in the dead tree might match up with 200 rings early in the life of the living tree, so the two trees together can count back many years. In this way, multiple trees can be used to build a master chronology for a forested region. European oak trees have been used to build a 12,000-year chronology.¹

The annual ice layers in glaciers provide a similar method that goes back much further in history. Each year, snowfall varies throughout the seasons and an annual layer is formed. Like the tree rings, this method can be verified by comparison to historical records for weather, as well as to records of volcanic eruptions around the globe that left thin dust layers on the glaciers. Scientists have drilled ice cores deep into glaciers and found ice that is 123,000 years old in Greenland² and 740,000 years old in Antarctica.³ These annual layers go back much farther than the 10,000 years advocated by the young earth creationists. The Earth must be at least 740,000 years old.

How can an old Earth be reconciled with Genesis? See Scripture Interpretation

Age of the Earth and solar system from radiometric dating

In your high school science classroom, you may have seen a large poster of the periodic table hanging on the wall. The periodic table shows the types of atoms that make up the world around us. An element in the periodic table can come in different flavors called isotopes. Some isotopes are unstable, and over time these isotopes “decay” into isotopes of other elements. For example, Potassium-40 is unstable and decays into Argon-40. As time passes, a rock will have more and more Argon-40 and less and less Potassium-40. Radiometric dating is possible because this decay occurs at a known rate, called the “half-life” of the radioactive element. The half-life is the time that it takes for half the radioactive sample to change from one element into the other.

Some isotopes have short half-lives of minutes or years, but Potassium-40 has a half-life of 1.3 billion years. Radiometric dating requires that one understand the initial ratio of the two elements in a given sample by some means. In this case, Argon-40 is a gas that easily bubbles out and escapes when it is produced in molten rock. Once the rock hardens, however, all the Argon-40 is trapped in the sample, giving us an accurate record of how much Potassium-40 has decayed since that time. So, if we find a rock with equal parts Potassium-40 and Argon-40, we know that half the Potassium-40 has decayed into Argon-40, and that the rock hardened 1.3 billion years ago.⁴

It’s hard to find rocks on the surface of the Earth that have not been altered over time. Most old rocks have been eroded by wind and water or submerged by continental plates. The oldest reliably dated rock formation is in Greenland, where several different isotopes were used to find an age of 3.6 billion years.⁵ Scientists also recently dated zircon grains (which resist erosion) in Western Australia to 4.4 billion years old.⁶ To find older rocks that haven’t been eroded, we need to look beyond Earth. Meteorites are rocks from the solar system that have fallen to Earth recently and haven’t suffered much erosion. Their pristine interiors give an age that dates back to their formation at the beginning of the solar system. Nearly all meteorites have the same radiometric age, 4.56 billion years old.⁷ Thus, the solar system, including the Earth, is about 4,560,000,000 years old.

PLEASE READ THE REST OF THE ANSWER HERE.

Notes

Davis A. Young, ”How Old Is It? How Do We Know? A Review of Dating Methods – Part One: Relative Dating, Absolute Dating, and Non-radiometric Dating” Perspectives on Science and Christian Faith, Vol 58 No 4 (2006), p. 264. (PDF)
Roger C. Weins, "Radiometric Dating: A Christian Perspective", The American Scientific Affiliation (2002). See also North Greenland Ice Core Project Members, “High-resolution Record of Northern Hemisphere Climate Extending into the Last Interglacial Period,” Nature 431 (2004): 147–151, which reports ages back to 123,000 years. (web article)
EPICA Community Members, “Eight Glacial Cycles from an Antarctic Ice Core,” Nature 429 (2004): 623–628.
Young earth creationists reject radiometric dating methods, including claims that decay rates are not constant. For a critical review, see Randall Isaac “Assessing the RATE Project”, Perspectives on Science and Christian Faith, vol 59, no 2, June 2007, p.143-146. (PDF)
See Wiens and references therein. (web article)
Wilde et al. “Evidence from detrital zircons for the existence of continental crust and oceans on the earth 4.4 Gyr ago,” Nature (2001) 409, 175-178.
See Davis A Young, ”How Old Is It? How Do We Know? A Review of Dating Methods—Part Two: Radiometric Dating: Mineral, Isochron and Concordia Methods” Perspectives on Science and Christian Faith, Vol 59, No 1 (2007) and references therein (PDF)

"Centered": The Language of Science and Faith

Karl Giberson — Fri, 18 Nov 11 05:56:02 -0800

In a recent interview with the Sirius XM radio show Centered, Karl Giberson, co-author of BioLogos' The Language of Science and Faith, sat down with host Don Belanus to discuss the book and the interplay between science and faith. Among the topics they cover are what constitute the "genuine questions" of science and faith mentioned in the title and whether the age of the earth should be a top priority for pastors to discuss with their congregations.

Navigating the Crises

Brian McLaren — Wed, 21 Sep 11 09:11:52 -0700

Today's video is courtesy of filmmaker Ryan Pettey, director/editor of Satellite Pictures.

In this video, author and pastor Brian McLaren discusses the idea of surrogate arguments, in which a debate over one thing is really a means for arguing something completely different. According to McClaren, the argument over the age of the earth is one such example, in which an apparent scientific debate is actually a discussion over the nature of religious authority and how previous generations have understood how we should interpret the Bible. Such debates can lead to two crises: one of confidence and one of ethics. While some have the confidence to differ with the views of the generation that raised them in the faith, McLaren points out that some are not able to overcome the ethical challenge of differing with grace and love. When this happens, he notes, the end result is damage to the Church and a retrenching of the views of the older generation. Managing the crises well requires courage of convictions while also respecting tradition and maintaining a gracious spirit. Anything less, is not only unwise, it is also unfaithful.

God's Use of Time

Matthew Blackston — Fri, 19 Aug 11 05:00:43 -0700

I can still recall the first time I encountered a man performing as a living statue. His costume, body paint, and utter stillness made him very convincing. I also recall the eerie feeling I experienced upon first seeing him move. Ordinary statues are, of course, static, but if you hang around a living statue long enough you’re bound to see it move, if only to blink its eyes. I find that when many Christians think about the way God created our universe, our planet, and the forms of life that dwell on it, they often bring a static expectation similar to what we bring to an ordinary statue. It’s as if we assume the physical realm were merely a rigid three-dimensional sculpture, immovable with time.

But since time exists, change and development are possible. The sciences have acquired the tools to “look back” in time and explore our universe’s rich history, so we know that the universe and the life in it do indeed evolve. Through these observations in the natural realm, it’s difficult to avoid the conclusion that God typically prefers to do His work gradually rather than instantaneously. In what follows, I’d like to briefly explore some of the ways that our universe has been and is evolving over long periods of time and attempt to show that the concept of a God who makes use of long timescales ought to be familiar to us from the story of redemption in scripture. And like observing a living statue, by staring long enough (in this case millions and billions of years) we are able to see a world that is moving and changing, which hopefully deepens our appreciation for the wonder of God’s dynamic creative acts.

God’s use of time in the physical realm

The sense of enjoyment that comes from studying the dynamically evolving universe that God has created is similar to that of a gardener when he or she watches a seed grow into a mature plant. And when considering the history of the cosmos, the analogy of a seed in a garden is an apt one, with each branch of science reinforcing and corroborating the story that is told.

From physics we learn that all the matter and energy that now exists in our universe originated in a hot, dense state (something akin to a primordial seed) which burst forth and has been expanding and cooling ever since. Myriads of stars have gone through the process of forming, burning, and dying, with many exploding in what's called a supernova. These long stellar life cycles have been going on for billions of years and are responsible for "cooking up" and dispersing all the atomic elements necessary for forming planets like Earth and creatures like us.

Once our planet formed, we know from geology and its theory of plate tectonics that the earth's crust has been in a constant (but very slow) process of moving and changing, shifting even the continents around over many millions of years and forming majestic mountains, islands, and other geological features. The picture becomes even more fascinating when biology enters the landscape, describing how life has slowly developed, also over many millions of years, beginning from the simplest of organisms and progressing all the way to beings like us, of such complexity that we are able to reflect on and enjoy the entire display.

But how do we know all this, since our short lives don’t allow us to see these long drawn out processes in action? I see these same sciences as a great gift from God that allow us to explore beyond the bounds of our own time. For instance, when astrophysicists look up into the night sky, they see light that has taken millions or even billions of years to reach us, meaning that they are literally looking at what our universe looked like in the distant past. Geologists look back in time by studying layers of rock, sediment, or ice. They have even found evidence that the earth's magnetic field has flipped many times over the course of the Earth's history so that even the direction our trusty compasses point isn’t constant! Biologists have the fossil record and genetics as a means of exploring the rich and fascinating history of life, teaching us about the ancestors of modern humans as well as exotic creatures such as dinosaurs. All around us the physical world is shifting, changing, and unfolding in an extraordinary way, teaching us that God, the ultimate Gardener, is pleased to watch his creation grow and mature gradually.

God's use of time in redemption up to Jesus

A good number of Christians find the idea of God using long maturation times in creation threatening to their understanding of scripture. But what we learn about God from scripture is not inconsistent with a God who works over long timescales. We see this if we look at the grand meta-narrative of the entire Bible, of which I’ll cover a few highlights to demonstrate my point.

After humans made a mess of their intended role in the created order, God desired to restore it and put it right. And like what we learn from the sciences about the evolution of the universe, He decided to take his time about it. God began his redeeming work with a promise to use Abraham's family to be a blessing to the entire world (Gen. 12:1). This was a promise that was ultimately fulfilled in Jesus nearly two millennia later. Now if God had been in a hurry, he might simply have allowed Sarah to conceive by the Holy Spirit and bring forth Jesus directly. But instead, he decided to take the scenic route, working through Abraham’s seed, including Jacob, Moses, David, and others until the time was right for Jesus.

As time went on and God’s people developed into a nation, David rose to the throne and God made another promise -- that of perpetual kingship to David’s line (2 Sam 7:13). This was another opportune time for Jesus to be born, take the throne, and fulfill the promise. But again we find God taking his time, allowing the kingdom to be divided and eventually conquered, and God’s people sent into a long exile, until the time was right for Jesus, nearly a millennium after David.

God's use of time in redemption after Jesus

The Christian faith holds that in the “fullness of time” (Gal. 4:4) God sent Jesus as the individual in whom all the promises of God ultimately converged. Just as God's physical creation developed slowly and eventually brought forth our earth and life and humanity, so God's purposes slowly unfold and culminate in Jesus, the descendant of Abraham and David who becomes the blessing to the world.

But here again is another case that demonstrates the point I’m attempting to make. Even the blessing that Jesus comes to announce and inaugurate develops slowly and dynamically – God, the Gardener, continues to slowly cultivate. Jesus himself teaches us to expect this to be the case in parables about the kingdom such as that of the mustard seed (Mark 4:30-32). Thus, the world isn’t automatically cured of its ills after Jesus’ resurrection. Both then and now, evil, sin, and injustice still exist and there is much that remains to be redeemed. The church is called to continue living in this meta-narrative until we reach the second climax: when Jesus reappears and ushers in the fullness of the new heavens and new earth.

A similar point can be made about God’s redemptive work in the lives of individual Christians as well. God forms each of his children over time through our relationships, our experiences, the trials we encounter, and the service we render. “I am the vine, you are the branches”, says Jesus in John 15:5. God is “growing us” as individuals and as every Christian knows from experience, the maturing process often seems very long indeed.

In conclusion, this brief survey has shown a consistent picture of how God works in his creation. In the cosmos, in the evolution of life, in the redemption of the world, and in the redemption of individuals, God sees fit to use long timescales for accomplishing his purposes. Moreover, with the similarities between what we learn of God from nature and from scripture, Christians needn’t react defensively to what science tells us about the history of the cosmos. Instead, we can indulge in the opportunity to marvel at the ever continuing work of God the Gardener, both in His dynamic creation and His dynamic acts of redemption.

Photo courtesy of Flickr user ToniVC.

When Appearances Are Deceiving

Rev. Scott Hoezee — Thu, 03 Feb 11 11:32:56 -0800

“That just doesn’t sound right.”

At one time or another, we have all had this reaction to something someone said to us. Usually what we indicate by saying this is that we sense intuitively that something is amiss in what was just communicated to us but we cannot at the moment lay our finger on just what that “something” is.

Ever since I was a kid, that was my gut reaction to those well-meaning people in my church and school who told me that despite what many in the sciences were saying, the earth and the entire universe were actually of relatively recent manufacture (say, on the order of 10,000 years of age or so). Yes, there are rocks on the earth that test out to be millions of years old but you must understand: all of those things popped into existence in one fell swoop already bearing the marks of a certain age. God created the universe in motion with the appearance of age. It looks old but it isn’t. Already on his first night in Eden, Adam was able to see stars that we can now measure to be so far away that their light would take millions of years to get here. But because God created things already in motion, that light hit Adam’s eyeballs immediately even though the universe was a scant six days old.

That never sounded right to me, but one could conceive of it. Doing such a thing would hardly be beyond an almighty God’s abilities. God could snap his fingers and create any state of being he wanted. Still, something about the whole “appearance of age” scheme nettled. After all, what God could do cannot trump what a loving and true God would do.

My “Ah-Ha” moment that confirmed my intuition that something was wrong here came a few years ago when my colleague, Deborah Haarsma, gave a guest lecture in a theology and science course I was teaching. At one point Deb said to the class that we must remember that the light that streams to us from stars and galaxies and nebulae is not just generic light—these streams of light tell a story. They represent cosmic history. All of that light is the collective memory of the cosmos. It tells us about when stars were born. It tells us about when stars matured. It tells us about when stars died (and the stages they went through en route to their deaths). Light tells a story. It tells the story of the universe.

As a preacher, I have spent years training myself to think analogically. Those of us who preach for a living (and those of us who teach for a living) know that one of our main tasks is to take complicated doctrines, theories, or concepts and try to make them plainer and easier to understand by way of analogy. We are constantly saying, “Think of this idea this way . . . “ or “I know this portion of theology sounds difficult to grasp but what if you realize that it is actually a little like this . . .”

Deb’s helpful comment that beams of light tell the universe’s story finally helped me come up with the analogy that made me hit on the “something” that was wrong with this whole scheme. Ever since then, here is what I have told people in order to convey to them what I believe is wrong with the appearance of age argument.

Saying the universe was created in motion is sort of like this: imagine you are like me, a guy who will turn 47 years of age in March of 2011. As a 47-year-old person, I have almost five decades of memories. I can remember my brother being born when I was four years old. I can remember my mother walking me to kindergarten, my family moving to a new area when I was half-way through second grade, graduating from high school, traveling to Europe for the first time, meeting my wife, and the births of my two children. This memory stream, this history of my life that appears to me in my mind, is clear and vivid and undeniable. There is nothing inside of me or in the ways I retrieve these images to tell me they are anything other than iron-clad truth. This is what has happened to me along the way. This is my story. I’ve even got pictures and videos of all those times. I have other people who were there then, too, and who confirm my memories by sharing their own.

So how would I feel if someone—based on some piece of insight they thought they had allegedly received from the Bible or some other source—told me that in reality Scott Hoezee (and everything else for that matter) had been created in motion starting at my 45th year of life in 2009? Yes, everything about me—every DNA test available, every bone scan or memory scan or any other way by which the medical establishment could determine a person’s chronological age—all of it could confirm my 47 years but . . . my actual life would be but 2 years. So what about all those memories that stream to me from 42 years ago when I started kindergarten or from 19 years ago when my first child was born? What about the pictures, the videos, the others who remember it all, too? Well, they look and sound true but strictly speaking are not. None of those things happened (not in the way the last two years’ worth of stuff happened anyway). Installing those memories (of things that never truly took place) were necessary to make Scott’s appearance of age appear authentic but all of them (all 45 years’ worth of stuff) popped into existence at the same moment Scott did a scant two years ago. The events of the last two years are as real as they appear to me. The stuff from the previous 45 years . . . not so much.

If someone told me that it was God who did this all, I would conclude that God is cruel. That sense of cruelty would only be reinforced in case it were also true that within the human sphere of things, there would be absolutely no way I could know about the falsity of all those memories because in the proper exercise of my mental faculties and in the proper use of medical technologies by which my age could be verified, there would be no earthly reason to doubt the veracity of those memories or of the full 47 years they represent.

I would feel deceived.

The history of the universe—when stars were born, when they died, and other events that come to us in the streams of light that beam toward our planet every day—may seem far less personal than the birth of my first child or my remembering when Mom took me to kindergarten. But if all that cosmic information and history are not true—and if there is no way within the normal exercise of our human abilities to measure things to know any better—then why would God build up a story of the universe’s past life in case none of it (save for the last 10,000 years) ever actually took place but was made only to look as though it took place?

I would not like God to do that to me and the story of my life as I apprehend it. But I don’t like this concept any better when it applies to life beyond myself, either. That just doesn’t sound right.

And it isn’t.

Series: The Biblical Premise of Uniformitarianism

Stephen O. Moshier, Gregory Bennett — Sat, 19 Jun 10 07:59:04 -0700

Students of geology learn in their first semester that uniformitarianism is the guiding principle by which geologists interpret Earth’s history. The premise, as formulated by James Hutton in the late 18th century and argued persuasively by Charles Lyell in the middle 19th century, is that geological processes we observe today can be used to explain ancient geological materials and structures. For example, today we see the rock basalt forming by volcanic activity. Since we find basalt layers exposed in Shenandoah National Park, we presume that lavas oozed onto an ancient seafloor sometime in the distant past before the Blue Ridge Mountains formed.

Young-Earth Creationists/Flood Geologists reject the geological principle of uniformitarian on the grounds that (1) it is inherently unbiblical, (2) it was developed to refute biblical catastrophism, and (3) it does not fulfill its promise to help us correctly interpret Earth’s history. These concerns are repeated in Young-Earth creationist literature and even from the pulpits of many churches. Recently in his internet blog, distinguished American pastor John MacArthur (well known for his popular radio ministry) portrayed geological uniformitarianism as a dangerous dogma (here and here).

I respect Dr. MacArthur’s commitment to the authority of Scripture and his passion for the gospel message, but as a professional geologist and Christ-follower I found so many errors in his analysis that I feel they must be exposed in a similar forum. In a recent BioLogos Forum blog, Karl Giberson lamented the all-to-common situation in which “uninformed lay people presume to challenge the scientific community.” Pastors should not be expected to know all the nuances of a concept like geological uniformitarianism, nor the details of landforms and strata in some state park in Georgia (we will get to that). However, pastors should be cautious and responsible if they challenge the consensus of an established scientific discipline in the name of advancing the gospel.

Faulty assumptions, old definitions

Dr. MacArthur defined uniformitarianism as “the theory that natural and geological phenomena are for the most part the results of forces that have operated continuously, with uniformity, and without interruption, over billions and billions of years,” and that the “forces at work in nature are essentially fixed and constant.” There are elements of this description in nearly every textbook or dictionary definition of the term. I like the definition in the Glossary of Geology by Bates and Jackson: “The fundamental principle or doctrine that geologic processes and natural laws now operating to modify the earth’s crust have acted in the same regular manner and with essentially the same intensity throughout geologic time, and that past geologic events can be explained by phenomena and forces observable today....the doctrine does not imply that all change is at a uniform rate, and does not exclude minor local catastrophes.”

The example Dr. MacArthur gives to illustrate this principle is not how geologists apply it in their interpretations of Earth history. He writes, “The uniformitarian sees sedimentary rock strata...and assumes that the sediments that formed them resulted from the natural, slow settling of particles in water over several million years.” Geologists can point to very few natural environments of deposition where this kind of slow settling of particles actually occurs – the deep sea and large lakes come to mind. There certainly are some ancient rocks with textural properties that compare with deep sea and lake deposits. But, many more ancient strata compare perfectly with deposits of modern rivers, deltas, reefs and tidal flats (to name a few among many examples) that form by episodic accumulation of sediments in short periods of time (from seconds to centuries), separated by longer periods of non-deposition or erosion (from months to millennia and even longer).

Paradigm shift: uniformitarianism includes catastrophes

Dr. MacArthur mentions that fossils have a better chance of being preserved if they are buried suddenly (if not catastrophically), and uniformitarian geologists would agree! That’s because modern geologists don’t even subscribe to 19th century uniformitarianism. A paradigm shift occurred in the middle 20th century replacing uniformitarianism with actualism, an addendum to the principle allowing that extreme natural forces have acted in Earth’s history. For our purposes, we will use the term uniformitarianism as it is used by geologists today, not the 19th century definition. Uniformitarianism includes catastrophic events such as thousands of earthquakes from plate tectonics and various meteorite impacts (see footnote ii). As with all science, our understanding of processes has changed from the 19th century to the 21st century.

One of the turning points involved a unique landform called the channeled scablands in eastern Washington State that seemed to defy conventional explanations. Geologist J. Harlan Bretz proposed that they were formed by catastrophic floods of swift, deep water escaping from glacial lakes at the end of the last ice age.¹ The geological community eventually accepted his ideas, but it took over 30 years and some mind stretching to think about such forces as being normal or natural. Bretz was not motivated by biblical flood geology, but by following the evidence where it led him.²

An old earth is not unbiblical

Dr. MacArthur claims that geologists have to keep increasing the age of the earth to make time for all the catastrophes evident in the rock record. That comment ignores the historical development of the geologic time scale as eventually quantified by the middle of the twentieth century. Geologists have known that the earth is in the range of 4.5 billion years old since the 1950s.

Our understanding of Earth history was advanced by thousands of geologists since Hutton and Lyell laboring over the details the earth’s crust and considering each stratum in the context of the planet as a whole. They abandoned the ideas of a very recent creation and global deluge of geological significance because those ideas were not supported by the geological data.

Many of the early geologists knew the implications of the emerging picture for the biblical accounts of origins and they looked to Bible scholars of their time for help. Modern evangelicals know those Bible scholars who accepted the new geology and showed that it was not inconsistent with the meaning of Scripture. Men like B. B. Warfield, James Orr and George Fredrick Wright; men who also contributed to the origins of the fundamentalist movement. Just as respected evangelical biblical scholars of our generation find an ancient creation no threat to biblical faith, such as Alister McGrath, C. John Collins, Bruce Waltke, Wayne Grudem, John Walton and Walter Kaiser.

Dr. MacArthur’s blogs conclude with the geological example of Providence Canyons in southwest Georgia to show the ineptness of uniformitarianism. Poor farming practices in the last century in this upland plateau resulted in severe erosion of the natural drainage system, cutting numerous gullies up to 130 feet deep. If Georgia’s Little Grand Canyon could form in only decades, why couldn’t receding water from Noah’s flood carve Arizona’s Big Grand Canyon? That both canyons were carved by water is about the extent of the comparison! A detailed look at the strata eroded in Providence Canyons provides further evidence that actualistic assumptions work.³

Uniformitarianism reflects God’s unchanging nature

Finally, do we really want to condemn uniformitarianism, or its offspring actualism, as an unbiblical premise? Dr. MacArthur quotes scriptures that ring of the catastrophist actions of God in nature. However, there are also scriptures that speak of the unchanging nature of God and...well, nature. Ecclesiastes 1 comes to mind with its poetic refrains: “Generations come and generations go, but the earth remains forever....All streams flow into the sea, yet the sea is never full. To the place the streams come from, there they return again.....What has been will be again, what has been done will be done again; there is nothing new under the sun. Is there anything of which one can say, "Look! This is something new"? It was here already, long ago; it was here before our time. There is no remembrance of men of old, and even those who are yet to come will not be remembered by those who follow.”

In Part 2 and Part 3, Gregory Bennett will explore how the concept of uniformitarianism as used by geologists is necessary for our full understanding of God’s relationship to nature. He will also explore how uniformitarian principles are used by every biblical interpreter including use within one of the core tenants of Christian doctrine, God’s providence.

References:

Bates, R. L., and Jackson, J. A. Glossary of Geology, American Geological Institute 1987.

Donovan, A. D., and Reinhardt, J., Providence Canyons: the Grand Canyon of southwest Georgia. Geological Society of America Centennial Field Guide –Southeastern Section, 1986.p. 359-362.

Giberson, Karl, "Would you like fries with that theory?". May 10, 2010.

MacArthur, John, Uniformitarianim, Part 1. May 7, 2010.

MacArthur, John, Uniformitarianim, Part 2. May 10, 2010.

Notes

1. This event occurred about 11,500 years ago during a period of rapid global warming over a 200 to 400 year period of time, according to evidence from ice cores in Greenland and lake and cave sediments across the Northern Hemisphere.
2. In addition, geologists find evidence of major catastrophic events such as meteorite impacts. One example is the Chicxulub crater buried below the surface on the Yucutan Peninsula of Mexico, resulting from a meteorite impact about 65 million years ago and approximately coinciding with the dinosaur extinction. It was discovered during seismic exploration for oil. The crater is over 100 miles in diameter, and left telltale ash about 1,000 miles away in the sediments offshore Florida, and over 6,000 miles away in Italy and Denmark.
3. Once the protection of surface vegetation was removed, streams easily cut through the poorly consolidated sand deposits of the Upper Cretaceous Providence Formation to create the numerous large gullies at Providence Canyons. Those sand deposits compare with sands that are deposited today in near-shore marine conditions (like off the coast of Georgia today). The deposits feature cross-bedded layers formed by migrating sand bars with burrow tubes and traces from animals that lived on and below the sea floor (Donovan and Reinhardt, 1986). This is no flood deposit where animals were suddenly buried in a catastrophic event, but a record of episodic sedimentation in an ancient sea where marine critters ate, reproduced and died under normal marine conditions; modern uniformitarianism exemplified!

Evidences for Evolution, Part 1: An Ancient Earth

David Kerk, Falk, Darrel — Mon, 31 May 10 08:00:43 -0700

A literalistic view of Genesis causes many evangelicals to believe that the earth is less than ten thousand years old. Christian children and young people frequently grow up being told that the earth is young and that evolution is a lie. The most popular science/religion web-site by far according to Alexa ratings is “Answers in Genesis”, and its museum, dedicated to a young earth perspective has attracted over 1 million visitors since its opening two years ago. Since evangelicals, we believe, are correct about so many other all-important issues, how can we be so certain that so many are so wrong about this one? Consider sending this link to a young earth friend or pastor. Some think that the science behind this matter can’t be trusted. Nothing could be further than the truth.

The beauty of the scientific process is its inherent scepticism. (See "What Scientists Do" by Steven Benner). If there is only one way of reaching a conclusion, the scientific process requires the scientist to remain highly sceptical. The only conclusions in science which are widely accepted are those which are supported by multiple, reinforcing lines of evidence – “all roads must lead to Rome”. If there is even one scientific trajectory that seems to clearly lead off to Peoria instead of Rome (to use a recent analogy of Francisco Ayala), the scientific process demands that the scientist find out why. The scientist who does not retain an attitude of scepticism when there is only a single line of evidence, and particularly one who ignores other, conflicting lines of evidence, is on a stubborn trajectory of his own—a trajectory to failure. If the only reason for following the directions which “lead away from Rome” is a particular view of Scripture, then it is important to consider the possibility of human error. Biblical hermeneutics, after all, is a human enterprise just as science itself is. For example, John MacArthur in his current series on Genesis is human and is interpreting Genesis in his way just like the rest of us. He, wonderful pastor and shepherd that he is, interprets Scripture too. There is good reason to be quite certain that the interpretation he subscribes to is mistaken.

As Christians, we are called to follow Jesus. In so doing, Jesus said we are to love the Lord our God with all our heart, soul and mind—not just our heart and soul. Indeed if we close our mind, we are actually disobeying what Jesus said was the greatest commandment of all. So let’s not be shy about using those minds. Are there multiple independent ways of keeping track of time since the creation of the earth? If so, do each of those ways point to the same conclusion?

The best known method of calculating the age of material on earth depends on the well-established fact that certain elements in the earth’s crust are unstable and decay at a fixed rate that can be measured. (For an introduction to this topic see this BioLogos FAQ.) This instability functions sort of like a set of clocks that have been ticking through the eons of time. Indeed there are many types of unstable elements; there are many ticking clocks. Each of the various clocks tick at a different rate. The rate of each can be calibrated, and, with an amazing degree of consistency, all “clocks” point back to the same starting point: an ancient earth with rocks that are hundreds of millions and even billions of years old. This “ticking clock” technique is known as radiometric dating.^1,2

There are other totally independent ways of estimating the age of material on earth. To appreciate how these work, perhaps we should start with shorter spans of time, which for human beings are much more readily comprehensible. Some of the fondest boyhood memories of one of us (DK) come from visits to the majestic California redwood forests. He especially remembers an exhibit of a section from a giant tree which showed the pattern of growth rings within it. It turns out that these rings accumulate in response to seasonal differences in rainfall and temperature, which in turn produces differences in growth rate. Fastened within this huge slab of wood was a series of tags, proceeding from the surface inward, demonstrating the dates of major historical events: the landing of the Pilgrims on Plymouth Rock; Columbus’ discovery of the New World; the Norman conquest of England, and so forth. It was possible to see in the yearly growth rings a history of what seemed then to be the very distant past!³

Growth layering processes are not restricted to trees. Many species of marine invertebrates accumulate calcium carbonate from their watery environment and incorporate it into some form of shell. Examples would be clams and corals. In fact, for these species, the variation in shell deposition occurs on a both a daily and a yearly basis, so an even finer counting of time periods is possible.⁴

Just as it is possible to count the rings in trees and correlate their age to known historical events in the past, it is also possible to count the banding patterns preserved in the fossils of marine organisms, and use this as a method to estimate their ages. Let’s see how it works.

Astronomical data, developed and analyzed over the past couple of centuries, has revealed that the rotation of the earth is gradually slowing down. This is due to the friction created daily by the moving tides on the earth’s surface, produced by the gravitational pull of the moon and sun. Furthermore, as the earth slows down slightly, some rotational energy is transferred to the moon, which alters its orbit slightly (its orbit is moving slowly away from the earth). The data leading to these conclusions range from analysis of ancient solar eclipses (whose dating allows the precise position of the earth, sun and moon to be determined) to bouncing laser beams off mirrors placed on the surface of the moon by the Apollo astronauts. For our purposes, what will be important is the slowing of the earth’s rotation. This predicts that the length of each day has been slowly increasing since the formation of the earth/moon system. The average increase in the day length is estimated at 2.3 milliseconds (.0023 seconds) per century.^5,6 Hence as we examine events in the past, day length was shorter, by an amount that can be calculated. Ten thousand years ago, a day would have been .23 seconds shorter than it is today. If direct experimental estimates of day length can be obtained, they allow an estimate of the age of the material.

One way that such experimental estimates of day length can be obtained is through the periodic growth rings deposited in the shells of marine invertebrate organisms. Take for example a clam living in an intertidal environment. If the tide is in and the shell is open, it can readily absorb oxygen from water, use aerobic metabolism, and incorporate calcium carbonate into its shells. When the tide is out and the shells are closed, however, little oxygen can be absorbed, anaerobic metabolism is used, shell decalcification occurs, and organic rich material accumulates in the shell. This alternating pattern of shell deposition occurs on a daily basis, and is clearly visible in both shells from living and fossil clam species by microscopic examination. Furthermore, shells contain an identifiable mark resulting from the first freezing day of winter, and from the first really hot day of summer. Hence a yearly growth interval can be readily determined.⁷

When such data are analyzed for a number of fossil species, it is clear that the number of days these organisms experienced each year was higher than today. Given that, we have another clock - a totally independent way of measuring the age of certain fossils. So how well do clocks based upon radiometric dating agree with those based on measuring rings in certain sea shells?

As already mentioned, organisms living 10,000 years ago would have experienced shorter days, but they would only have been shorter by 0.2 seconds. Organisms living 1 million years ago would have experienced a day length that was 20 seconds shorter. If the earth really is very, very old, organisms living 465 million years ago, for example, would have experienced approximately 416 days per year, each day being about 21 hours long.⁷ Amazingly, shelled fossils in formations dated by radiometric clocks to be about 465 million years old show, by their banding patterns, that the days really were three hours shorter. In fact the two sets of clocks agree within 1 percent!

Another way such estimates of ancient day length can be derived is to look at the periodic patterns formed in fine silts in ancient river estuaries. The daily tides produce shifts in the mud, leaving a fine layering pattern, which is recorded in rock as these sediments transform into materials such as sandstone (such deposits are called “rhythmites”). Other shifts in the mud are produced over longer time intervals, including seasonal and yearly shifts. By counting the number of daily depositional layers per year, in a similar fashion to work with marine organism shells cited above, an estimate of ancient day length can be derived. One advantage of the rhythmite analysis method is that it can be applied to more ancient materials, in eras of the earth’s history when organisms suitable for shell analysis were scarce or non-existent. For example, radiometric analysis of certain rock formations in South Australia dated them at 620 million years of age. On this basis one would predict that the day/night cycles should have been about 20 hours long in these formations. Actual measurements of day length from the preserved mud banding patterns, although off from the expected by ten percent (estimated day length is 22 hours) is again consistent with the formation being hundreds of millions of years old just as the radiometric dating has predicted.⁸

In conclusion, there is data derived from three independent sources: the decay of radioisotopes, the growth patterns recorded in fossilized shells of marine organisms, and rocks containing tidal depositional material from river estuaries, which all agree on an ancient age for the earth. Furthermore, by a totally independent method it is also possible to measure the age of the universe as a whole and again it is billions, not thousands of years.

All of the roads in God’s book of Nature “lead to Rome” (i.e an ancient earth) - it is only mistaken human interpretation of Scripture that causes some of our precious brothers and sisters in Christ to end up in Peoria.

The next blog in this series can be found here.

Editor's Note: Dr. Kerk offers a further discussion of the age of the earth in the comment section of this post, beginning here. Dr. Kerk has also included the following graph:

References

1: Elementary principles of radiometric dating are discussed by Richard Dawkins. Dawkins, R. 2009. The Greatest Show on Earth: The Evidence for Evolution. Free Press, New York Pgs. 91-98.

2: Wiens, R.C. 2002. Radiometric Dating: A Christian Perspective. This is a more detailed but still highly readable account of radiometric dating, written by a well-qualified physicist who is also a professing Christian. It can be obtained from the web site of the American Scientific Affiliation: http://www.asa3.org/ASA/resources/Wiens.html

3: Tree ring dating (“dendrochronology”) is discussed by Dawkins, pgs. 88-91.

4: Dating using coral skeletal deposition is discussed by Jerry Coyne: Coyne, J.A. 2009. Why Evolution is True. Viking Penguin, New York. Pgs. 24-25.

5: “Tidal Acceleration”, Wikipedia: http://en.wikipedia.org/wiki/Tidal_acceleration

6: Stephenson, F.R. 2003. Historical Eclipses and Earth’s Rotation. Astronomy and Geophysics 44:2.22-2.27.

7: Zhenyu, Z., Yaoqi Z., Guosheng J. 2007. The periodic growth increments of biological shells and the orbital parameters of Earth-Moon system. Environmental Geology 51: 1271–1277.

8: Williams, G.E. 2000. Geological constraints on the Precambrian history of Earth's rotation and the Moon's orbit. Reviews of Geophysics 38(1):37-59.

How are the ages of the Earth and universe calculated?

Wed, 22 Apr 09 12:07:41 -0700

Introduction

Age of the Earth from seasonal rings and layers

How can an old Earth be reconciled with Genesis? See Scripture Interpretation

Age of the Earth and solar system from radiometric dating

Age of galaxies from the travel time of light

What about the ages of stars and galaxies, and the age of the whole universe? One way to measure these ages is with the travel time of light. Light travels incredibly fast – 300,000 kilometers per second, or 186,000 miles per second. On Earth, the delay due to light travel time is a tiny fraction of a second. But in space, the distances are so vast that the light takes a substantial amount of time to travel to us: 8.3 minutes from the Sun, 4.3 years from the nearest star, and about 8500 years from the center of the Milky Way galaxy. That delay means that we don’t see these objects as they are right now, but as they were when the light left. The universe actually works as a sort of “time machine,” in which we can see into the past simply by looking far away.

The calculation of the light travel time is simple once you know the speed of light and have a measurement of the distance. The speed of light is well known from experiments on Earth, and various astronomical observations confirm that the speed of light has not changed over the history of the universe. But measuring distances in astronomy is not trivial – you can’t just string a measuring tape from here to the center of the galaxy! Instead, astronomers use several interlocking methods to determine the distances, such as geometric calculations and brightness measurements. For example, some galaxies look much smaller and fainter than other galaxies of the same kind, showing they are much further away.⁸

The Andromeda galaxy, a near neighbor to our own Milky Way galaxy, is 2.3 million light years away. That is, we are seeing it as it was 2.3 million years ago. But that is just our local neighborhood. In recent decades, astronomers have detected galaxies located several billion light years away. If the light has been traveling billions of years to reach us, then the universe must be at least that old. This is completely independent of radiometric dating of the solar system, but both methods point to an age of billions of years, not thousands.

See Did God create everything recently but make it appear old?

Age of the universe from expansion

Not only can astronomers measure the distance of galaxies, they can measure how galaxies are moving. Galaxies are not holding still in space, nor are they moving randomly. Some galaxies are moving towards their neighbors, attracted by their mutual gravity. But the biggest pattern we see is that galaxies are moving apart from one another. This motion apart is not all at the same speed; instead it follows a pattern where galaxies that are further apart are moving more quickly.

This particular pattern indicates the whole universe is expanding. To see why, consider a loaf of raisin bread. The raisins are like galaxies and the dough is like the fabric of space in the universe. As the dough rises, it carries the raisins along, pulling them apart from each other. Raisins that started out on opposite sides of the loaf will be a few inches farther apart after the dough rises, while raisins that started out near each other may only move half an inch. So, the speed of their motion is proportional to the separation between them. In the same way, the space of the universe pulls galaxies further apart as the universe expands.

Astronomers detect a galaxy’s motion by looking at its light spectrum. When a galaxy is carried away by the expansion of space, its light waves are stretched out, making it appear redder. The change in the galaxy’s color is called the red shift, and can be used to calculate its velocity. From the measurements of many galaxies, astronomers can accurately measure the expansion rate of the universe as a whole.

The age of universe can be determined by imaging what the universe looked like in the past, “rewinding” the expansion. In the past the galaxies must have been closer together, and in the distant past they would have been packed together in a tiny point. If we assume that the expansion rate is constant over time, the age for the universe as a whole is about 10 billion years. However, astronomers have been working over the last 20 years to determine how the expansion rate changes with time. We now know that early in the universe the expansion was slowing down, but now it is speeding up. Using careful measurements of this change in expansion rate, the age of the universe is now known quite precisely to be 13.7±0.13 billion years. ⁹

Conclusion

Many different and complementary scientific measurements have established with near certainty that the universe and the Earth are billions of years old. Layers in glaciers show a history much longer than 10,000 years, and radiometric dating places the formation of the Earth at 4.5 billion years. Light from galaxies is reaching us billions of years after it left, and the expansion rate of the universe dates its age to 13.7 billion years. These are just a sampling of the types of evidence for the great age of the Earth and the universe; see the resources below for more.