Baumgartner, P. O. (1993): Origin of late Paleozoic and Mesozoic radiolarites in the Tethyan and Circumpacific realms. Canadian Society of Petroleum Geologists, Calgary, AB, Canada, In: Beauchamp, Benoit (chairperson), Embry, Aston (chairperson), Glass, Don (editor), Carboniferous to Jurassic Pangea, first international symposium; program and abstracts, 17, georefid:1994-053937