Abstract
A nearly complete sequence of Ordovician strata along Fox River, southwest of Aurora, indicates the presence of the Kankakee arch-a major structure trending northwest-southeast across northeastern Illinois -and the probable location of the Sandwich fault, which parallels the arch for many miles and had been found previously by studies of well records. Outcrops of sandstone and dolomite which have long been correlated with the St. Peter and Galena-Platteville formations have been found to belong to the New Richmond sandstone and the Shakopee dolomite. Study of the outcrops and well records shows that the anticlinal structure underwent major movements both before and after deposition of the St. Peter sandstone.
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