Daily Archives: January 27, 2017

Wooster’s Fossil of the Week: Ammonite septa from the Upper Cretaceous of South Dakota

This week we have an ammonite from the Pierre Shale (Upper Cretaceous, Campanian-Maastrichtian) of southwestern South Dakota. It was collected on a wonderful field expedition in June 2008 with my friend Paul Taylor (The Natural History Museum, London) and my … Continue reading

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