1. Tree ring dating
The oldest living tree has been dated to over 4,000 years. Now, the creationist might say it began growing after the flood. But wait a minute, we have dead fossilized trees that lived before this one(nearly 9,000 years ago), as well as during its lifespan. How do we know this? The tree ring patterns (controlled largely by the weather, as to how far apart they are, etc.) match up. This poses a MAJOR problem to the flood. If the older fossilized trees had been alive, they managed to survive the flood. That's not possible. They would have drowned, or crushed by the weight of the water.
To break it down:
4,000 year old tree with specific growth ring patterns.
Fossilized trees with same ring patterns plus 5,000 years before 4,000 year old tree.
Keep comparing ring data....
IF there was a world wide flood, the trees would be killed off and there would be no overlap in ring growth at some point.
This is not what we see... So the trees continued to grow through a continuous period of time.
Carbon 14 dating is also in agreement with the ages.
Click here for some refutations to common creationist claims about tree rings.
2. Animal Burrows in the geologic column
Shrimp, insect, and other animals' burrows have been found throughout the geologic column. If there was a catastrophic flood dumping all the sediment at once, then how could animals have possibly burrowed through every single layer in the geologic column (which is about 15,000 feet deep or around 3 miles). All those sediments being dumped at once would have surely killed these creatures, and if not, it is grossly implausibe to think of them climbing through so much sediment! It fits much better with the idea of the sediments being laid down very slowly. Long before the sediments hardened into rock, the creatures would have had lots of time to burrow through the ground.
3. Fossilized Mudcracks
Fossilized mudcracks have been found in the geologic column, indicating it had time to dry out before being fossilized. Would a violent flood have preserved these? NO!
4. Plant Fossils
Plants have no way of "running for higher ground" or escaping in any way as creationists have suggested other animals did. So why did flowering plants not appear until the cretaceous period? Why didn't seeded plants appear until the devonian?
5. The Order of The Fossil Record
This one is a real doozy for creationists. Just why are sedentary, bottom dwelling fish found in higher strata? (Kitchins, "Living with Darwin") Why aren't flightless birds like the ostrich and emu found with dinosaurs? Why aren't human beings found with Australopithicenes? They have proposed several methods by which to explain why fossils just look like they have evolved, all of which have been refuted. Just listen to what Stephen Jay Gould said about this at the Arkansas Creation Trial,
"Another good example is in the evolution of single-celled creatures. It is a unicellular calcite called foraminifera. Many of the foraminifera are planktonic; that is, they are floating organisms. They all live in the same lake floating at the top or the upper waters of the oceans, they don't differ in hydrodynamic properties. They live in the same ecological zone, and they certainly don't differ in intelligence and mobility. They don't even have a nervous system.
And yet for the last twenty years there has been a worldwide program to collect deep sea cores from all the oceans of the earth. And in those cores, the sequence of planktonic foraminifera species are invariably the same. Each species is recognizable and lives in only a small part of the column; some at the bottom of the column, some at the top of the column. Those at the bottom do not differ from those at the top, either in intelligence, ecological examination, or hydrodynamic properties."
To be continued...