paleontology
What are they? I have no clue?

I got these yesterday at an auction in Eaton, CO. I couldn't pass them up, but I don't know what they are. What are they? I have no clue?

From: Rhonda M.

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Unknown Fossils: What are They? , 5.5 out of 10 based on 2 ratings

2 Responses to “Unknown Fossils: What are They?”

  1. Scott says:

    The one on the left is almost certainly a mineral formation called a septarian nodule. It is an interesting formation even without being a fossil and they have fooled even the most experienced fossil collectors with their strange looks. Nodules like these can sometimes be very beautiful when cut in half and polished. This one look interesting in it own right if you would like to display it. The other one is more difficult to tell. It could be a fossil coral, but it could also be a calcite formation of some sort. Anyone out there have some ideas on this?

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  2. Dave Bohaska says:

    One on the right is internal mold of one chamber of an ammonite.

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