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Pennsylvanian disc-shaped fossil

DaveCO

By DaveCO
in Fossil ID

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DaveCO New Member

DaveCO

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Hi experts, this year during one of my trips to the San Diego Canyon in northern New Mexico, I found this mystery fossil. It looked a lot like a mushroom to me, complete with radial fissures on the surface and a hint of a stalk on the backside. It is about 4cm in diameter and about 1cm thick. Any ideas? Coral? Heavily deformed bivalve? Red herring?

Thanks for your input!

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DaveCO New Member

DaveCO

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Note that this was found where there are abundant brachiopods and crinoid parts, from shallow sea environment in the Pennsylvanian era.

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Shamalama Regular Member

Shamalama

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Welcome to the forum!

 

I think you have a cross section of a Brachiopod and the Crinoid stem section passes thru the specimen via the "mound" just below the Brach outline. Not much else to go on there,, sorry.

-Dave

__________________________________________________

Geologists on the whole are inconsistent drivers. When a roadcut presents itself, they tend to lurch and weave. To them, the roadcut is a portal, a fragment of a regional story, a proscenium arch that leads their imaginations into the earth and through the surrounding terrain. - John McPhee

If I'm going to drive safely, I can't do geology. - John McPhee

Check out my Blog for more fossils I've found: http://viewsofthemahantango.blogspot.com/

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DaveCO New Member

DaveCO

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Doing some additional research online, I am starting to believe this is a sponge. But the top surface is smooth. Does anybody have experience with sponges from this era?

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DPS Ammonite Regular Member

DPS Ammonite

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You may need to look at this under a magnifying glass/ microscope to see spicules. Do you see anything that looks like spicules?

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My goal is to leave no stone or fossil unturned.   

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