Reworked upper Devonian tasmanitids occur in last glacial maximum (29-17 ka) sediment located in isolated basins: the western Great Lakes region, and continental-slope deposits in the Gulf of Mexico (GOM). The source of the microfossils includes the New Albany Shale (Indiana, Illinois) and Atrim Formation (Michigan). Not only are the cysts new unique index fossils for GOM Pleistocene stratigraphy, the present dataset indicates that most erosion of the Great Lakes Michigan, Huron, and Erie occurred during the last glaciation.
About the speaker
Dr. Curry is a Principal Research Scientist and head of the Quaternary and Engineering Geology section of the Illinois State Geological Survey, Prairie Research Institute. All of his degrees have been in geology, including a Bachelor of Arts from the University of California at Santa Barbara, a Master of Science from Purdue University, and a PhD from the University of Illinois at Urbana-Champaign. He has been with the ISGS almost his entire professional career, over 35 years. He specializes in Illinois’ Quaternary geology, focusing on its history, stratigraphy, paleopedology, environmental geology, surficial mapping, and paleolimnology.