Possible Galactic Causes for Periodic and Episodic Glaciations Steiner, J. ; Grillmair, E. Abstract Publication: Geological Society of America Bulletin Pub Date: 1973 DOI: 10.1130/0016-7606(1973)84<1003:PGCFPA>2.0.CO;2 Bibcode: 1973GSAB...84.1003S