James W. Hagadorn and Edward S. Belt (2008), Stranded in Upstate New York: Cambrian Scyphomedusae from the Potsdam Sandstone, Palaios, v. 23, p. 424–441, doi 10.2110/palo.2006.p06-104r The formation reaches its maximum thickness of about 450 meters in the northern Champlain lowland.