mtwoman Posted April 3, 2021 Share Posted April 3, 2021 Found in Parker County, Aledo area, Texas, 3-26-21. Limestone base. 1 Link to comment Share on other sites More sharing options...
DPS Ammonite Posted April 3, 2021 Share Posted April 3, 2021 (edited) Reminds me of Tetragramma. A formation name will narrow it down. Use this map to find a formation name: https://txpub.usgs.gov/txgeology/ @JohnJ Edited April 3, 2021 by DPS Ammonite 1 My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
mtwoman Posted April 3, 2021 Author Share Posted April 3, 2021 Oh thanks for that map tool; very helpful. Here's the info for the exact spot I found the echinoid: Rock unit: Goodland Limestone Rock unit code: Kgi Sheet name: Dallas Period: Cretaceous Epoch/series: Comanchean Group: Fredericksburg Geo oder #: 9755 Does that help? Link to comment Share on other sites More sharing options...
JohnJ Posted April 4, 2021 Share Posted April 4, 2021 I agree with @DPS Ammonite that this is a Tetragramma species. The perforate tubercles are a defining characteristic. This is very likely a nice sized Tetragramma malbosii. The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
mtwoman Posted April 4, 2021 Author Share Posted April 4, 2021 Thank you. Link to comment Share on other sites More sharing options...
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