dilas shell jaw crusher

dilas shell jaw crusher

A nearly complete jaw plate of Ptychodus mortoni in the collection at the Sternberg Museum of Natural History. A section of a rare and unusual ptychodontid jaw plate first described by Samuel Williston in 1898 (Plate XXVIII from Volume VI of The University Geological Survey of Kansas. He had named it Ptychodus martini (KUVP 55271).

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