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U.S. Geological Survey Open-File Report 2009-1137

Quaternary Geologic Framework of the St. Clair River between Michigan and Ontario, Canada

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Figure 22. Photograph showing a ledge of glacial till exposed at the riverbed in the northernmost St. Clair River area. Apparently, the till has been scoured and undercut. The void at the upper shows where a clast about 10 cm in diameter has been eroded from the till. (See fig. 20 for the location of this photograph; photograph by D. Foster, U.S. Geological Survey.)
Figure 22, glacial till.

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