Now I think this is worthy of concideration, don't you?
Yes, let's consider some things shall we:
Why small organisms dominate the lower strata, whereas fluid mechanics says they would sink slower and thus end up in upper strata?
Why no human artifacts are found except in the very uppermost strata. If, at the time of the Flood, the earth was overpopulated by people with technology for shipbuilding, why are none of their tools or buildings mixed with trilobite or dinosaur fossils?
How does a global flood explain angular unconformities? These are where one set of layers of sediments have been extensively modified (e.g., tilted) and eroded before a second set of layers were deposited on top. They thus seem to require at least two periods of deposition (more, where there is more than one unconformity) with long periods of time in between to account for the deformation, erosion, and weathering observed.
How were mountains and valleys formed? Many very tall mountains are composed of sedimentary rocks. (The summit of Everest is composed of deep-marine limestone, with fossils of ocean-bottom dwelling crinoids. If these were formed during the Flood, how did they reach their present height, and when were the valleys between them eroded away? Keep in mind that many valleys were clearly carved by glacial erosion, which is a slow process.
How were limestone deposits formed? Much limestone is made of the skeletons of zillions of microscopic sea animals. Some deposits are thousands of meters thick. Were all those animals alive when the Flood started? If not, how do you explain the well-ordered sequence of fossils in the deposits? Roughly 1.5 x 1015 grams of calcium carbonate are deposited on the ocean floor each year. A deposition rate ten times as high for 5000 years before the Flood would still only account for less than 0.02% of limestone deposits.
How does a flood explain the accuracy of "coral clocks"? The moon is slowly sapping the earth's rotational energy. The earth should have rotated more quickly in the distant past, meaning that a day would have been less than 24 hours, and there would have been more days per year. Corals can be dated by the number of "daily" growth layers per "annual" growth layer. Devonian corals, for example, show nearly 400 days per year. There is an exceedingly strong correlation between the "supposed age" of a wide range of fossils (corals, stromatolites, and a few others -- collected from geologic formations throughout the column and from locations all over the world) and the number of days per year that their growth pattern shows. The agreement between these clocks, and radiometric dating, and the theory of superposition is a little hard to explain away as the result of a number of unlucky coincidences in a 300-day-long flood.
How did diseases survive? Many diseases can't survive in hosts other than humans. Many others can only survive in humans and in short-lived arthropod vectors. The list includes typhus, measles, smallpox, polio, gonorrhea, syphilis. For these diseases to have survived the Flood, they must all have infected one or more of the eight people aboard the Ark. Host-specific diseases which don't kill their host generally can't survive long, since the host's immune system eliminates them. For example, measles can't last for more than a few weeks in a community of less than 250,000 because it needs nonresistant hosts to infect. Since the human population aboard the ark was somewhat less than 250,000, measles and many other infectious diseases would have gone extinct during the Flood. For numerous communicable diseases, the only known “reservoir” is man. That is, the germs or viruses which cause these diseases can survive only in living human bodies or well-equipped laboratories. Well-known examples include measles, pneumococcal pneumonia, leprosy, typhus, typhoid fever, small pox, poliomyelitis, syphilis and gonorrhea. Was it Adam or Eve who was created with gonorrhea? How about syphilis? The scientific creationists insist on a completed creation, where the creator worked but six days and has been resting ever since. Thus, between them, Adam and Eve had to have been created with every one of these diseases. Later, somebody must have carried them onto Noah's Ark. Creationists can't pin the blame for germs on Satan. If they do, the immediate question is: How do we know Satan didn't create the rest of the universe? That has frequently been proposed, and if Satan can create one thing, he can create another. If a creationist tries to claim germs are mutations of otherwise benign organisms (degenerate forms, of course), he will actually be arguing for evolution.
How did all the fish survive? Some require cool clear water, some need brackish water, some need ocean water, some need water even saltier. A flood would have destroyed at least some of these habitats.
How did animals get to their present ranges? How did koalas get from Ararat to Australia, polar bears to the Arctic, etc., when the kinds of environment they require to live don't exist between the two points? How did so many unique species get to remote islands?
How were ecological interdependencies preserved as animals migrated from Ararat? Did the yucca and the yucca moth migrate together across the Atlantic? Were there, a few thousand years ago, unbroken giant sequoia forests between Ararat and California to allow indigenous bark and cone beetles to migrate?
Why is there no mention of the Flood in the records of Egyptian or Mesopotamian civilizations which existed at the time? Biblical dates (I Kings 6:1, Gal 3:17, various generation lengths given in Genesis) place the Flood 1300 years before Solomon began the first temple. We can construct reliable chronologies for near Eastern history, particularly for Egypt, from many kinds of records from the literate cultures in the near East. These records are independent of, but supported by, dating methods such as dendrochronology and carbon-14. The building of the first temple can be dated to 950 B.C. +/- some small delta, placing the Flood around 2250 B.C. Unfortunately, the Egyptians (among others) have written records dating well back before 2250 B.C. (the Great Pyramid, for example dates to the 26th century B.C., 300 years before the Biblical date for the Flood). No sign in Egyptian inscriptions of this global flood around 2250 B.C.
Why do other flood myths vary so greatly from the Genesis account? Flood myths are fairly common worldwide, and if they came from a common source, we should expect similarities in most of them. Instead, the myths show great diversity. For example, people survive on high land or trees in the myths about as often as on boats or rafts, and no other flood myth includes a covenant not to destroy all life again.
How can a literal interpretation be appropriate if the text is self-contradictory? Genesis 6:20 and 7:14-15 say there were two of each kind of fowl and clean beasts, yet Genesis 7:2-3,5 says they came in sevens.
How can a literal interpretation be consistent with reality? How could Noah have gathered male and female of each kind [Gen. 7:15-16] when some species are asexual, others are parthenogenic and have only females, and others (such as earthworms) are hermaphrodites? And what about social animals like ants and termites which need the whole nest to survive?
Why stop with the Flood story? If your style of Biblical interpretation makes you take the Flood literally, then shouldn't you also believe in a flat and stationary earth? [Dan. 4:10-11, Matt. 4:8, 1 Chron. 16:30, Psalms 93:1, ...]
Does the Flood story indicate an omnipotent God? If God is omnipotent, why not kill what He wanted killed directly? Why resort to a roundabout method that requires innumerable additional miracles? The whole idea was to rid the wicked people from the world. Did it work?
Finally, even if the flood model weren't riddled by all these problems, why should we accept it? What it does attempt to explain is already explained far more accurately, consistently, and thoroughly by conventional geology and biology, and the flood model leaves many other things unexplained, even unexplainable. How is flood geology useful?