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Ordovician fossil ID


Nathalie

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These are located in the Ellenburger Group (Gorman Formation) in central Texas. I can provide a more exact location if needed. The rocks formed as part of a large carbonate bank during the Ordovician. Upward growing mounds usually make me think of stromatolites, but these don't really look like other stromatolites I have seen. I also thought perhaps a coral or sponge, but those are invertebrates I am not very good at identifying. Any help with identification would be appreciated. Thanks!

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My first thought is a sponge. But better pictures (close up details) would be needed to be sure.

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I found this online:

 

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Thank you! I appreciate the help.

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