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Extent of the main glacial advances

Extent of the main glacial advances.jpg Reconstruction of coal-forming swampThumbnailsPhysiographic provinces of IllinoisReconstruction of coal-forming swampThumbnailsPhysiographic provinces of IllinoisReconstruction of coal-forming swampThumbnailsPhysiographic provinces of Illinois

Extent of the main glacial advances which began with the Nebraskan (a—the oldest) and ended with the late Wisconsinan (f—the youngest). Diagram “d” shows the major stream development during the time between the Illinoian and the earliest Wisconsinan glaciers. The heavy lines on the diagrams indicate major stream valleys that were present during these times.

a. Inferred limit of NEBRASKAN glaciation
b. Inferred limit of KANSAN glaciation
c. ILLINOIAN glacial advance
d. SANGAMONIAN major drainage
e. Maximum WISCONSINAN glacial advance
f. Late WISCONSINAN Valparaiso front and Kankakee Flood

Author
Inside Illinois: Mineral Resources
Educational Series 9
Author: Anonymous Available from gutenberg.org
Keywords
America, Maps, Prehistoric
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