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Creek bed round thing?


Creek - Don

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Found a curious circular thing on the bottom of the creek.  It looks like a circular coral that I saw picture on the Internet once.   Creek bed is around middle cretaceous period.  

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Looks like Rudist material. 

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If it is Austin Chalk (Kau), you are likely seeing the remnants of giant Inoceramus clams. The calcitic fragments are typical of these large clams.

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   Most of the giant clams located here in Dallas Austin Chalk are like like this on the picture.   One I found on the creek bed are more odd shaped though. 

20190901_161910.jpg

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5 hours ago, JohnJ said:

If it is Austin Chalk (Kau), you are likely seeing the remnants of giant Inoceramus clams. The calcitic fragments are typical of these large clams.

John is right. Inoceramids (some have divided Inoceramus into many genera), have a shell composed of calcite prisms that are normal to the shell surface.

 

See: 

http://oceansofkansas.com/Inoceramids.html

 

“According to Sowerby 1823, Inoceramus means "fibrous shell," describing the prisms that are visible on the edge of shell fragments.”

35F91E47-8CCC-4B13-8E46-2FAACB951D58.jpeg

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