In part 1 I whittle on about Flora and Fauna (https://confessionsofayec.wordpress.com/2014/03/24/more-flood-stuff-part-1-flora-and-fauna/)
Geology and the Flood
Moving on from animals and plants, the mechanics and timescales of the flood as described in Genesis requires some very serious geological events. The word cataclysmic hardly seems appropriate; the activity would have been utterly incredible. Creationists will argue that it was the events of the flood that created the mountains we see today and that most of the flood water came from below the ground.
Beyond that, the layers of rocks we see today and the fossils we see in them are all formed from the flood events. Did the rocks before the flood have layers?
Rock layers deposited by a global flood could be believed if they were flat. There is still an issue over how the layers are so easily defined because layers deposited at the same time would have some mixing and the change between layers would be expected to be more blended rather than distinct. Another issue to consider is that today rock layers can be curved or even vertical. Sediment does not settle in stacks or neatly along a curve, rock layers that curve or stand up, but remain uniform, will have been bent after they formed because if the sediment was loose at the time it would have been shifted off its neat and even layers. Considering uplifted rock, this can only be done very slowly over many thousands of years because if rock bends quickly it tends to crack and break, hence earthquakes. This means that non flat rock layers could not have been formed as part of a global flood and the associated mountain upheavals, unless a miracle is invoked to keep the rock intact.
This miracle requirement rather makes a mockery of the whole idea of using geologic study to confirm creationist accounts. When the miraculous is required to complete the explanation then by definition, naturally explainable actions are done away with and cannot be used.
But look at all the fossils
Creationists also point at the flood as the cause of the fossils that we see today because all the animals that died in the flood would have been buried by the subsequent sedimentary layers. This, they say, is why fossils can be found halfway up mountains and it is a better explanation than plate tectonics pushing the sea bed up and creating mountains.
The mechanisms at play here are a problem for creationists. If the creationist explanation were true, I would expect the larger heavier animals to sink faster, along with the heavier sediment and the smaller lighter animals to settle slower, like the smaller lighter sediment. I would also expect the dead animals to drop quicker than most of the sediment and so the resulting layers would show more animals at the bottom and fewer and smaller animals at the top of the sedimentary layers. This is not at all what we see in the fossil and rock layer record. The observed evidence completely contradicts the expected result.
The timing of the flood events are also out of order. The claim is that the mountains were formed at the start of the flood as part of the “waters of the deep” bursting forth and supplementing the rainfall. This would mean that the mountains were formed before the sediment had settled and buried the animals and people. Talking of which, where are the people fossils?
Looking at the fossils in more details we can see that the vast majority of fossils show species that are not alive today and fossils that exactly match species we know and love today and conspicuously rare. The answer is typically that not all the animals which survived the ark also survived to today. For the flood account to be the single source of all (or at least most) fossils then the fossils what we see ought to be representative of the animals that were saved on the ark. Therefore besides dinosaurs, we should also see dogs and rabbits. I would also expect to see a drowned city full of bodies of modern humans fossilised, including evidence of clothes in the fossil. This is an example of a prediction based on creationism that should be possible to confirm but is lacking.
How long does it take to form a fossil?
The process of creating a fossil requires significant timescale because a chemical process is required to replace minerals in the dead body with the minerals from the surrounding material. It seems this process typically requires water and pressure. (http://www.discoveringfossils.co.uk/whatisafossil.htm) these mineralisation processes occur at rates that can be measured, which is how ages can be determined. Note the following AiG article on the subject spends precious little time talking about the actual fossilisation process (http://www.answersingenesis.org/articles/nab2/do-rock-record-fossils-favor-long-ages).
If fossils could be formed in just four thousand years, then scientists would be able to show that by burying an animal in the right conditions and showing that the process had started in only a few decades. This is a simple experiment that creationists can do to show the world how right they are.
Too many holes
The flood story is a very dramatic story but simply doesn’t hold water as an historical event. The bible account is vague and leaves way too much open for the readers to insert their own facts. This is what creationists do constantly and they should be honest about what they are doing and they should be even more honest about how critically they view the evidence of the world against what the bible says because none of it matches.