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Ptychodus atcoensis, Atco

Mikrogeophagus

By Mikrogeophagus

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Ptychodus atcoensis, Travis Co.

Coniacian, Cretaceous

Nov, 2021

 

Can be identified by the characteristic chevron ridge pattern.

 

Actually my first ever ptychodus. Took me a long time to figure out what it was since atcoensis is a rarer species. As a beginner, it turned me off of pinning down ptychodus species since I worried they might all be as difficult!

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Austin Chalk

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  • Taken with Apple iPhone 11
  • Focal Length 4.3 mm
  • Exposure Time 1/1287
  • f Aperture f/1.8
  • ISO Speed 32
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Jared C

holy..... was this a matrix or gravel find?

 

Also, not to be the devils advocate, but are you sure it's not P. latissimus? :)

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Mikrogeophagus

Mikrogeophagus

Posted (edited)

@Jared C This was a gravel find, but it shares a lot of visual characteristics I've seen in the Atco deposits from upstream. It's a little harder to see from this angle, but the chevron shape seems to match well with atcoensis. To top it all off, @LSCHNELLE has looked at it in-person and agrees with the ID.

 

I'm processing some Atco matrix from that formation as we speak. Hopefully I can find a friend for this guy :BigSmile:.

Edited by EPIKLULSXDDDDD
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