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Pedernales78

Is this an echinoid?

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Pedernales78

Picked this up out of the Dry Frio river bed near Uvalde, Texas  Thought it was a sand dollar at first.  Is this an Echinoid of some sort?

IMG_3528.JPG

IMG_3529.JPG

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ynot

Can We see other views and a scale?

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DPS Ammonite

It looks like the internal mold of a Cretaceous echinoid with traces of shell. The domed top with a flat bottom is similiar to Holaster sp. urchins.

 

See photos of Holaster from Lance Hall's webpage, http://northtexasfossils.com/ : 9-08-2007-003-800.jpg

 

 

 

 

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Coco

Hi,

 

I don't think it is a sea urchin because I don't see ambulacra and interambulacra areas.

 

Coco

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Pedernales78

It almost looks like a sand dollar.  Hard to say.

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Taogan

It's got the shape, but I can't see any typical structures

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Ludwigia
5 hours ago, Pedernales78 said:

It almost looks like a sand dollar.  Hard to say.

Sand dollars are flat, but it does look to me like it has the shape of an echinoid steinkern, as DPS Ammonite has already pointed out.

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