Marshall County Sec. 21, T. 4 S., R. 9 E

1/2 mile south of Frankfort, on K-99 Modified from section measured by Elias, 1932, by O'Connor and Jewett, 1952
	Unit No. Description Thickness   HOWE LIMESTONE MEMBER   1 Limestone, dolomite, buff to yellow, impure, cavernous, weathers rough, spongy with network of calcite and quartz veinlets and brownish ochre between veinlets. Fossils not identifiable. 1.0 ft. 2 Limestone, dolomite, shaley, to chalky, soft, splittery, buff 3 ft.   BENNETT SHALE MEMBER   3 Shale, calcareous, gray 1.5 ft. 4 Shale, dark gray, contains Orbiculoides 1.0 ft. 5 Shale, black, fissile 2.0 ft. 6 Shale, gray 0.7 ft.   GLENROCK LIMESTONE MEMBER   7 Limestone, hard yellowish tan, upper part contains abundant fusulinids, lower part contains foraminifera, ostracodes, gastropods, bryozoans, and other shell fragments, calcareous algae 2.5 ft.
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