Migration of glacial centers across Gondwana during Paleozoic Era Caputo, Mário V. ; Crowell, John C. Abstract Publication: Geological Society of America Bulletin Pub Date: 1985 DOI: 10.1130/0016-7606(1985)96<1020:MOGCAG>2.0.CO;2 Bibcode: 1985GSAB...96.1020C