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Filters: Tags: Calhoun County, Illinois (X) > Date Range: {"choice":"year"} (X)

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Exposure of Brussels formation showing thick beds of loess like silt interbedded with laminated clay. SE 1/4 NE 1/4 sec. 28, T. 13 S., R. 1 W. Calhoun County, Illinois. Circa 1928. Plate 13-A, in U.S.Geological Survey Professional paper 218. 1952.
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Specimen: Thinly laminated siltstone in Hannibal shale: NE 1/4 NE 1/4 sec. 1, T. 10 S, R. 3 W. Enlarged twice. Calhoun County, Illinois. Circa 1928. Plate 7-B, in U.S.Geological Survey Professional paper 218. 1952.
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Exposure of St. Peter sandstone along Mississippi River in Cap Au Gres, view northward from near Dogtown Landing in SW 1/4 sec. 29, T. 12 S., R. 2 W. Calhoun County, Illinois. Circa 1928. Plate 3-A, in U.S.Geological Survey Professional paper 218. 1952.
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Specimen: "Hamburg" oolite in Glen Park formation. SW 1/4 sec. 26, T. 9 S., R. 3 W., enlarged 1.5 times. Calhoun County, Illinois. Circa 1928. Plate 7-A, in U.S.Geological Survey Professional paper 218. 1952.