Dickinson County Sec. 21, T. 16 S., R. 2 E

"Insect Hill" #1 in E flowing ravine, joins #2 Measured By J.M. Jewett and R. Kulstad, June 25, 1952 Remarks: See #2
	Unit No. Description Thickness 6 Residual clay, limestone fragments, exposed 4.0 +/- ft. 5 Shale or impure limestone, ashy gray, weathers slightly rusty (more or less gradational weathering) 2.3 ft. 4 Shale, olive drab, brown mottling, non-calcareous, yellow in lower part 4.2 ft. 3 Shale, brownish-gray, slightly silty, very blocky, weathers light gray, becomes hard, slaty dark to near-black, plant fragments 1.3 ft. 2 Covered with calcite-impregnated zone, in joints and bedding at top 11.5 ft. 1 Limestone, slightly bluish-gray, crystalline unit 7 in #2 0.7 ft.
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