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Possible Cretaceous Sand Dollar


Caaaleb

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Hello,

 

I found what I believe to be a sand dollar a little over a year ago in a small creek in the DFW area in North Texas. I checked the USGS Pocket Geology on my phone and it said that the area in which I found the sand dollar in was in the Washita Group in the Cretaceous, next to some Woodbine Group members. I recently heard that sand dollars first appeared in the Eocene or Miocene or sometime in the Ice Age. But as already mentioned, I found the sand dollar in a Cretaceous area. Is it possible to find sand dollars in Cretaceous-era rock? Is it a REALLY early sand dollar? Or is it a mistake with the USGS Pocket Geology? Is this even a sand dollar? I see urchin patterns on it as well and the shape of a sand dollar, so I know it's at least an urchin of sorts.

 

I didn't know if I should've posted this in the Id Section or another section of the forum, so I think it's appropriate to post it here, right? Please correct me if I must post this somewhere else.

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This is not a sand dollar but another type of echinoid, there's a good chance an expert Texan will give you a more accurate identification.

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6 minutes ago, Top Trilo said:

This is not a sand dollar but another type of echinoid, there's a good chance an expert Texan will give you a more accurate identification.

Wow! Thank you. I had myself fooled this whole time. It's good to know it's not a sand dollar

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I found this Echinoid a bit over a year ago in a creek in the DFW area of North Texas. I found this in the Washita Group of the Cretaceous. I thought this was a sand dollar, but I recently learned that sand dollars did not appear until the Ice Age era. I posted a question regarding the Echinoid on the discussions section of the forum and was told it was not a Sand Dollar.

 

Anyway, I would like to know the species and classification of this flat Echinoid if anyone may know. I've never seen any Echinoid like it.

 

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20220222_164122.jpg

20220222_164158.jpg

20220222_164229.jpg

20220222_164246.jpg

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Even though I cannot see the surface details, this looks like a Coenholectypus echinoid due to its faint five sides, flattened profile and the slightly peaked top. See one from Finsley’s “A Field Guide to Fossils of Texas”.

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Thanks! I've been trying to self identify this sea urchin for a bit now and think your source might be it. I'll look into this

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Topics merged.  ;)

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