mark24, I don't have all the answers, but I gave you some answers, I don't believe in your millions of years for the different fossil layers(in this we agree to disagree), but assuming that the cambrian explosion was the genesis event, then were talking thousands of years, and not millions of years, for the fossils to be fossilizing, if no massive sediment fossil burials happen pre-flood, then you wouldn't have massive evidence pre-flood, think the only massive fossils evidences pre-flood might be the coral reefs that formed, pre-flood, that would have a lot of sediment from the tidal sediments burying and allowing the reef to grow upward, but these reefs are likely under up to a mile of flood sediments, but it would be interesting what kind of fossils are in the sediment layers above the coral reefs, etc...
1/ Why doesn't a single species in the modern day exist in the Cambrian?
things decomposed pre-flood (didn't fossilize), or they micro-evolved, or went extinct!
2/ Why doesn't a single species in the Cambrian exist today?
micro-evolution, or extinction
3/ Given that terrestrial plants were created on an earlier day than marine organisms, we should expect them to appear in the flood unaffected Cambrian sediments. They aren't. Not one. Not even pollen. Why?
liquefication, and short amounts of time since the creation event, and no massive pre-flood sediment burials preservation of pre-flood fossils.
4/ All fish are created on the same day as trilobites, yet where are the teleosts, placoderms, sarcopterygians etc? Completely & utterly absent. Why?
Fish should of survived the flood, however, some species went extinct, who knows why, breeding grounds, etc...
5/ Bryozoans are an entire phyla, & are completely absent from the Cambrian record. They should be there, where are they?
Are they present in coral reefs buried by the flood sediments?
6/ Why is 5/6ths of the fossil record in pre-flood sediments? How did those sediments get there?
Because the flood sediments buried the life pre-flood,(liquefication) unless they were carried away in the debris, or floated upward excessively, other 1/6th, etc...
7/ There are unicellular & multicellular fossils predating the Cambrian explosion. They exist in sediments that are unaffected by the flood. How did they get there?
I'm leaning God created the herbs, trees on day 3, so the algae, bacteria, that break down decaying matter, would of grown into the soil matrix, earth worms, etc...