First, remember that these fossils are found in sediments that were deposited inside an open pit and cave system. Where did the cave come from in the first place? The layers in which the cave originally formed are considered to be of Miocene age by geologists and most creationist writers accept that these rock layers were formed after a global flood rather than by a global flood. So the deposits, which contain various types of rock representing unique depositional environments must have been laid down and turned to rock prior to the dissolution of that same rock to form the cave. The cave then had to suffer a collapse resulting the creation of a pitfall trap. Only then could that pit begin to collect animals and preserve their remains. Over time the entire 30 foot-deep cavern had to fill up and its contents be fossilized.