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Re: Lewis and Clark

In a message dated 99-01-08 14:31:20 EST, you write:

<< Any speculation on what it
 may have been? Unfortunately, that's all the information he provided.

  In the area you describe, the exposures would probably be Niobrara Formation
(chalk) or possibly the overlying Sharon Springs Member (shale). Back in those
pre-dam days it would most likely be Niobrara. There are enormous tylosaurs
and elasmosaurs found there. They would be likely candidates. Cope collected
in that area also ( a tip of the hat to Jane ). Dan Varner.