PRE-WISCONSIN GLACIAL LIMIT (1:500,000) --
Pre-Wisconsin Glacial Limit (1:500,000)
Shows the extent of glaciation in Indiana as delineated by mapped glacial deposits of various types and ages. The mapped
units include Pleistocene sediments of glacial origin that are interpreted to have been deposited during multiple episodes
of continental glaciation by the North American Laurentide ice sheet. The term "pre-Wisconsin" is meant to distinguish this
glacial limit from that represented in a companion data set [WISCONSIN_GLACIAL_LIMIT_IN: Extent of Wisconsin Glaciation in
Indiana (Indiana Geological Survey, 1:500,000, Line Shapefile)] that represents the (later or younger) limit of Wisconsin
glaciation in Indiana.
Digitized from the glacial limit line represented on Plate 1 (1988) of Gray, H. H., 1988, Map of southern Indiana showing
geomorphic features relevant to ice marginal relict drainage in Gray, H. H., 1989, Relict drainageways associated with the
glacial boundary in southern Indiana: Indiana Geological Survey Special Report 45, 9 p.
FGDC metadata: PRE_WISCONSIN_GLACIAL_LIMIT_IN