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Four late Wisconsinan stratigraphie units crop out in coastal bluffs of Lake Michigan, northern Illinois. The lowermost unit is a muddy, matrix-supported, stratified diamicton exhibiting abundant sedimentary structures. Stratification is manifested by silt laminations, clay beds, layers of fractional gravel, and coarse-tail grading. Some beds are deformed by loading or folding. Intraformational units have concave erosional contacts with variable dip directions and slopes. Pebble fabrics are random or weakly developed, with wide dispersion of pebbles about the mean axes. These characteristics of the lower diamicton are consistent with resedimentation by subaqueous sediment gravity flows.

The lower diamicton is overlain by...

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