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More model informationPachydiscus n. sp.;
Late Cretaceous Pierre Shale Formation;
Fall River County, South Dakota, USA;
Steven D. Jorgensen Collection;
Approx. 16.5 cm x 14.5 cm x 5 cm;
Published in AMNH #3273 August 10, 1999 Landman, et al, page 18;
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