How did these fossils get thousands of feet above sea level? They didnt climb up the mountain and bury themselves. They were smashed and entombed, under the ocean in mud, and pushed up after the flood.
Well, Leonardo da Vinci investigated fossils up in the Alps about half a millenium ago, and found thick beds of clams and such in growth position- upper ones attached to lower shells - just like they grew off Italy at the time. No smashing involved.
About 140 years ago, Thomas Henry Huxley wrote an essay on the chalk that forms the White Cliffs of Dover as well as a lot of the subsurface of England. He lays it out much more clearly than I could:
http://aleph0.clarku.edu/huxley/CE8/Chalk.htmlIt isn't too long - go give it a read and let's discuss.