mkspsa Posted May 29, 2023 Share Posted May 29, 2023 Members might also find this presentation useful. It is from a presentation to the Paleontological Society of Austin in 2010. Includes some background and details on id for some species. As well as citations for Welton and Farrish and Shawn Hamm's thesis. https://www.austinpaleo.org/Presentations/PSA_Ptychodus.pdf 1 Link to comment Share on other sites More sharing options...
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