NEW GEOLOGIC MAP-BASED CORRELATION OF GLACIAL LANDFORMS IN SOUTHEASTERN LIVINGSTON COUNTY, MICHIGAN

Existing glacial geology interpretations for southeastern Livingston County, Michigan rely on 1:125,000 scale mapping by Russell and Leverett (1908). Recent 1:24,000 scale mapping sponsored by the Central Great Lakes Geologic Mapping Coalition and STATEMAP show that the area denoted as the interlobate moraine of the Saginaw lobe is actually composed mainly of kames that lie within of a zone of collapsed outwash and lacustrine sediments. A surficial diamicton on many of the kames previously described as till is observed in gravel-pit exposures to exhibit characteristics of debris-flow deposits. These interpretations require that the ice margin be beyond these deposits. Therefore, deposits previously interpreted as the interlobate moraine of the Huron-Erie lobe must, instead, mark the ice margin of the Saginaw lobe.