Just on the VERY outside chance that there's a geologist who runs across this....
I have a question about the Coconino formation and the description of its formation that I recently read on an Answers in Genesis website. The page is Startling Evidence for Noah's Flood. The Coconino formation is a massive layer of sandstone that is generally believed to be laid down in a generally desert-like condition - it's made of sand that is preserved in sand dunes, the footprints are of terrestrial creatures, the sand grains look weathered just like sand-dune sand of today, there are burrow tracks, etc. The "problem" that AiG is talking about is that this is a layer that was layed down during the Flood, neatly sandwiched between a couple layers of sediment.
So the question is, how was a hot and dry desert laid down in the middle of a global flood? Go read the page for the full article. I ran across a question (well a couple, but I'll hold myself to just one for you potential geologist reading this). I'm not as interested in the validity of the explanations put forward in the article, but I do hav a question about a part that seems to be self-contradictory. I can't write AiG, so I'm hoping some keywords in here will attract a wandering geologist!
Here are the two issues the article deals with: footprints and sand-dune formation.
The discussion of the footprints is based on a study by Dr Leonard Brand of Loma Linda University in California (note my keyword loading!). In it he studied tracks from the Coconino layer and the tracks made by modern lizards and amphibians in sand. The sand tracks were made underwater, in moist sand, and in dry sand, all laid at an angle like sand dunes. To makea long story short, Dr. Brand thinks the tracks were made underwater, most likely moving against the flow of water.
The discussion of the sand-dune formation is based on known formation of dune-like sand formations caused by sand at the bottom of the ocean. The height of the dunes is related to water depth, and it takes a certain velocity of water to form underwater sand waves. Based on the height of the Coconino dunes/sand waves, they would have been formed by water about 300 feet deep and moving for a prolonged stretch at 3-5 MPH.
All that leads to this: which is it? Was the Coconino formed in slow-moving shallow water which allowed dinosaurs from newt sized to multi-tonne sized to leave footprints? Or, was the Coconino formed under 300 feet of water rushing along at 3-5 MPH?
I'm not knowledgeable enough on the subject of recreating footprints to discuss the validity of the underwater footprint explanation compared to the desert sand track explanation. But, ignoring my ignorance on that topic, does the article contradict itself? It seems that the explanations rule each other out. If one has the tracks, then one can't have the dunes. If one has the dunes, one can't have the tracks.
People don't go around contradicting themselves (at least not just a couple paragraphs apart), but I don't know what the explanation is that could remove the self-contradiction. Any help would be much appreciated. If not, I'm used to not having everything answered.

I have a question about the Coconino formation and the description of its formation that I recently read on an Answers in Genesis website. The page is Startling Evidence for Noah's Flood. The Coconino formation is a massive layer of sandstone that is generally believed to be laid down in a generally desert-like condition - it's made of sand that is preserved in sand dunes, the footprints are of terrestrial creatures, the sand grains look weathered just like sand-dune sand of today, there are burrow tracks, etc. The "problem" that AiG is talking about is that this is a layer that was layed down during the Flood, neatly sandwiched between a couple layers of sediment.
So the question is, how was a hot and dry desert laid down in the middle of a global flood? Go read the page for the full article. I ran across a question (well a couple, but I'll hold myself to just one for you potential geologist reading this). I'm not as interested in the validity of the explanations put forward in the article, but I do hav a question about a part that seems to be self-contradictory. I can't write AiG, so I'm hoping some keywords in here will attract a wandering geologist!
Here are the two issues the article deals with: footprints and sand-dune formation.
The discussion of the footprints is based on a study by Dr Leonard Brand of Loma Linda University in California (note my keyword loading!). In it he studied tracks from the Coconino layer and the tracks made by modern lizards and amphibians in sand. The sand tracks were made underwater, in moist sand, and in dry sand, all laid at an angle like sand dunes. To makea long story short, Dr. Brand thinks the tracks were made underwater, most likely moving against the flow of water.
The discussion of the sand-dune formation is based on known formation of dune-like sand formations caused by sand at the bottom of the ocean. The height of the dunes is related to water depth, and it takes a certain velocity of water to form underwater sand waves. Based on the height of the Coconino dunes/sand waves, they would have been formed by water about 300 feet deep and moving for a prolonged stretch at 3-5 MPH.
All that leads to this: which is it? Was the Coconino formed in slow-moving shallow water which allowed dinosaurs from newt sized to multi-tonne sized to leave footprints? Or, was the Coconino formed under 300 feet of water rushing along at 3-5 MPH?
I'm not knowledgeable enough on the subject of recreating footprints to discuss the validity of the underwater footprint explanation compared to the desert sand track explanation. But, ignoring my ignorance on that topic, does the article contradict itself? It seems that the explanations rule each other out. If one has the tracks, then one can't have the dunes. If one has the dunes, one can't have the tracks.
People don't go around contradicting themselves (at least not just a couple paragraphs apart), but I don't know what the explanation is that could remove the self-contradiction. Any help would be much appreciated. If not, I'm used to not having everything answered.










