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With their prehistoric look, giant jaws with more than a 3500 pound bite force and its totally scaled bodies, one might think todays crocodiles are a perfect example of 'a living fossil'. But, that's not correct. Prehistoric crocodiles have change significantly over the millions of years of their existence. Fossil studies show their skeletal anatomy was once quite different than today's modern crocodiles. It's even theorized that ancient crocodiles were much more active and might have been warm blooded.
The Hell Creek Formation is an intensively studied division of mostly Upper Cretaceous and some lower Paleocene rocks in North America, named for exposures studied along Hell Creek, near Jordan, Montana. The formation stretches over portions of Montana, North Dakota, South Dakota, and Wyoming.
