» ARCHELON's also a sea-turtle conservation society, see ARCHELON, the Sea Turtle Protection Society of Greece Archelon's a genus of extinct sea turtle, the largest that's ever been documented. The first specimen of Archelon (YPM 3000) was collected from the Pierre Shale of South Dakota by Dr. G.R. Wieland in 1895 and described by him the following year (Wieland, 1896). The largest Archelon fossil, found in the Pierre Shale of South Dakota in the 1970s, measures more than 4 meters (13.5 feet) l… (More on Archelon)