Much as John Woodmorappe interprets the tree ring evidence, young earth creationists attempt to understand geology in a similar way. Thus for example Andrew Snelling discusses the fossil record:
For many people, the fossil record is still believed to be “exhibit A” for evolution. Why? Because most geologists insist the sedimentary rock layers were deposited gradually over vast eons of time during which animals lived, died, and then were occasionally buried and fossilized. So when these fossilized animals (and plants) are found in the earth’s rock sequences in a particular order of first appearance, such as animals without backbones (invertebrates) in lower layers followed progressively upward by fish, then amphibians, reptiles, birds, and finally mammals (e.g., in the Colorado Plateau region of the United States), it is concluded, and thus almost universally taught, that this must have been the order in which these animals evolved during those vast eons of time.
However, in reality, it can only be dogmatically asserted that the fossil record is the record of the order in which animals and plants were buried and fossilized. Furthermore, the vast eons of time are unproven and unproveable, being based on assumptions about how quickly sedimentary rock layers were deposited in the unobserved past. Instead, there is overwhelming evidence that most of the sedimentary rock layers were deposited rapidly. Indeed, the impeccable state of preservation of most fossils requires the animals and plants to have been very rapidly buried, virtually alive, by vast amounts of sediments before decay could destroy delicate details of their appearance and anatomy. Thus, if most sedimentary rock layers were deposited rapidly over a radically short period of time, say in a catastrophic global flood, then the animals and plants buried and fossilized in those rock layers may well have all lived at about the same time and then have been rapidly buried progressively and sequentially.
Insofar as one understands geological strata in the manner of James Hutton, the evidence cited is good evidence for evolution. Snelling, however, says that this is a misinterpretation of geology. According to him, “the vast eons of time are unproven and proveable, being based on assumptions about how quickly sedimentary rock layers were deposited in the unobserved past.” The idea is that since no one can go back and look at the past, it is unobserved and unobservable. Consequently nothing can be proven about it. This is a mistake, for the same reasons that Hume is mistaken in supposing that we cannot have probable knowledge about the future.
In any case, Snelling contradicts himself in the next sentence, saying, “Instead, there is overwhelming evidence that most of the sedimentary rock layers were deposited rapidly.” If claims about the past are unproven and unproveable and must be based on assumptions, this will apply equally to the claim that the sedimentary rock layers were deposited rapidly. If overwhelming evidence for this is possible, then it is also possible to have overwhelming evidence that they were deposited slowly.
Apart from the fact that it is not true that most fossils are in an “impeccable state of preservation,” and not true that they typically preserve “delicate details of their appearance and anatomy,” Snelling’s implication that evidence regarding the rate of deposition is possible after all, is fatal to his account, because the overwhelming evidence is precisely on the opposite side. His account may sound plausible on its face, but this plausibility depends on speaking in generalities and refusing to apply the account to the actual details found in the rocks.
There are many places around the earth with layers of salt, some thousands of feet in thickness. Just off the southern coast of the United States in the Gulf of Mexico, thick salt deposits sit beneath thousands of feet of sediment. These deposits lie within the layers that are said to have been deposited by the Flood.
We understand how salt beds form. At locations such as the Bonneville Salt Flats of Utah, or at the Dead Sea at the border of Israel and Jordan, salt is actively forming. Salt beds form when water is evaporated. During evaporation, the concentration of dissolved ions increases until the water cannot hold the salt in solution anymore and mineral salt begins to form. If a presently unknown or poorly understood process could produce salt without evaporation, as argued by young-earth advocates, it would quickly dissolve as soon as it came into contact with flood water, just as the salt from your saltshaker rapidly dissolves when added to water or moist food.
One might argue that the waters from the Flood could have evaporated to leave behind the salt deposits we see today, but there is a serious problem. The thousands of feet of sediment on top of the salt is also said to be from the Flood, meaning the flood waters cannot have evaporated to produce the salt and still be present and violent enough to transport thousands of feet of sediment to the same location. In other words, a single flood cannot be called upon to explain both the salt and the overlying sediment. For those who wish to argue that natural processes could have been vastly different during the Flood, there are at least two replies. First, under such a scenario, there is no point in Flood Geology studies any more than in normal studies, for nothing could be gained by the study of unknowable processes. A more important question, however, would be to ask why God would alter natural processes just to make Flood sediments look like they are not flood sediments. What would the purpose be? (We will revisit this thought later.)
Note that the formation of salt beds requires repeated evaporation, and consequently it will take an extremely long time to form a layer thousands of feet thick.
Davidson goes on to discuss numerous other details that cannot be explained by a process of rapid deposition:
The Grand Canyon is made up of a sequence of layers that defies any reasonable attempt to explain by a single flood. The alternating layers of limestone, sandstone and shale each form in unique environments. If these deposits were formed at different times under various sea-level stages, it is quite simple to explain the different grain sizes and rock types as a function of depth and distance from the shore line. If explained with a single catastrophic flood that abided by God’s natural laws of physics and chemistry, logic must be stretched beyond the breaking point.
As a very simple observation, consider instructions given in virtually every gardening book. A good soil will have a mix of sand, silt and clay. To determine the quality of your soil, you take a handful or two, put it in a clear container, add water and shake it up. When you stop shaking, the coarse grained material will settle out first resulting in a sequence of layers: sand on the bottom, then silt, then clay. You can readily see how much of each you have by the thickness of each layer.
This is informative of what we see in flood deposits. As moving flood waters slow down, finer and finer grained sediment settles out resulting in a “fining upward” sequence. If most of the Grand Canyon layers were laid down by the Flood, then we should see the same thing – a “fining upward” sequence. Instead, we see a series of alternating layers of fine and coarse grained material, with smaller-scale alternating layers within the larger ones. Increasing the violence of a flood does nothing to negate the standard order of deposition. Repeated surging of flood waters across the surface likewise offers little explanatory power; in this case we might expect successive layers, each with their own “fining upward” sequence, but such is not what is observed. Further, the Grand Canyon includes multiple layers of limestone, which are never found in flood deposits of any magnitude. Even in floods as massive as one thought to have catastrophically deluged the once dry Mediterranean Sea basin with thousands of feet of water – limestone beds are conspicuously absent.
I could give examples of responses to these kinds of considerations, but it would be a pointless exercise, essentially a repeating of the previous post. The reason that James Hutton and geologists like him came to the conclusion of “indefinite” time periods was that this is simply what is indicated by the rocks, and the misinterpretations of flood geology and the like are simply postulates made for the sake of a personal decision for personal motives, like that of Kurt Wise, with very little relationship with actual evidence.