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darrenrx

Georgia Fossil - Tusk Shell or Sea Urchin Spine

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darrenrx

Hi Fossil Forum,

I need help in identifying a fossil my friend found in middle Georgia. The area where he found it has been reported to have fossils from the Ordovician Period. It was found in a soft limestone sedimentary rock and appears to be a tusk shell or a sea urchin spine.

Any idea what this is?

Thanks,

Darren

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DPS Ammonite

The curve suggests a tusk shell. Take a photo of the ends to see if it shows the shell and cavity of a tusk shell or if it a single crystal of calcite all the way across with cleavage which suggests that it is an echinoid spine. Each echinoid spine is composed of a single crystal of calcite that grows with age.

Edited by DPS Ammonite

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Coco

Hi,

I don't think it is a sea urchin spine. It is very often in calcite, and calcite sea urchin spine often breaks itself with an angle about 45 °, what is not the case here.

Coco

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FossilDAWG

Tusk shell (Dentalium sp), Eocene, Ocala Limestone. Not Ordovician.

Don

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darrenrx

My friend went back to the same area in houston county and identified the layer as Tivola limestone from the Eocene period. I have a few more examples and two photos of the tusk shell end.

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