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I think I found part of your answer, I am providing a link: http://www.vertpaleo.org/source/oldbones/post.cfm/classification-and-turtles

My thoughts are also conjecture.

Look at the tree,...

What is this bone? I figure it is either a large hollow leg bone or part of a cranium, it is 3/4' thick and about 3' by 7'. It is a heavy chunk of bone.

I recently discovered an interesting outcrop on a stream, I showed an image of the bank that was cut to a geologist who said the top 15 to 20 feet were loess which are ontop of a layer of grey (black...