. Early Pennsylvanian paleotopography and depositional environments, Rock Island County, Illinois . Figure 2. Generalized sub-Pennsylvanian geologic map of Illinois. (From Plate 2, Paleotectonic investigations of the Pennsylvanian System in the United States, McKee and Crosby, Coordinators, Prof. Paper 853.)

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Keywords: ., bookcentury1900, booksubjectgeologystratigraphic, booksubjectpal