Sucia’s Super-Extinct Cephalopods

Way back in 1928, a UW student named Andrew Allen Weymouth wrote his Master’s thesis on the fossiliferous rocks of Sucia island.  In this work, he described three distinct faunal zones apparent in Sucia’s Cretaceous fossil records & distinguished each zone by the presence of 3 representative bivalve species: Trigonia tryoniana, Inoceramus vancoverensis, & Cucullaea vancovensis.  However, in addition to this species progression of now-extinct bivalves, Weymouth also found Ammonoidea fossils throughout all three faunal zones – a fossilized hommage to the hardiness of a cephalopod subclass that existed for over 400 million years!   :]





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