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Is this an echinoid?


Brad1978

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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?

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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

 

 

 

 

My goal is to leave no stone or fossil unturned.   

See my Arizona Paleontology Guide    link  The best single resource for Arizona paleontology anywhere.       

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Hi,

 

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

 

Coco

----------------------
OUTIL POUR MESURER VOS FOSSILES : ici

Ma bibliothèque PDF 1 (Poissons et sélaciens récents & fossiles) : ici
Ma bibliothèque PDF 2 (Animaux vivants - sans poissons ni sélaciens) : ici
Mâchoires sélaciennes récentes : ici
Hétérodontiques et sélaciens : ici
Oeufs sélaciens récents : ici
Otolithes de poissons récents ! ici

Un Greg...

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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.

 

Greetings from the Lake of Constance. Roger

http://www.steinkern.de/

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