Echinoids
Bottom of two Urchins were found in a creek that runs in north east Grayson co. Texas. I believe that they are in the Pawpaw formation, but could be Duck creek?
Photo Information
- Taken with NIKON COOLPIX P510
- Focal Length 12.4 mm
- Exposure Time 10/500
- f Aperture f/3.9
- ISO Speed 400
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