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

"Insect Hill" #2, near diggins for fossil insects in S flowing ravine, joins #1 Measured By J.M. Jewett, June 25, 1952
	Unit No. Description Thickness 14 Mostly covered, impregnated zone   13 Clay (at top, similar to top of unit 2 in #1), black, earthy, non-slaty 1.8 ft. 12 Limestone, gray, weathers light tan, abundant plant remains and charcoal fragments 0.1 ft. 11 Shale, mottled brown and dark gray, clayey, grades into... 2.3 ft. 10 Shale, slaty, hard, nearly black, thin beds, softer in upper part 2.6 ft. 9 Limestone, thin-bedded to calcareous shale, in upper part; lower is hard silty limestone, "dusty" appearing near conchoidal fracture 0.7 ft. 8 Shale, yellow at top, nearly all covered 1.7 ft. 7 (Bed #1 in section #1) Limestone slightly bluish-gray, crystalline 0.7 ft. 6 Covered 3.0 ft. 5 Limestone, near-black, hard laminated 0.5 ft. 4 Lignite zones in brown and gray shale, grades into... 0.7 ft. 3 Shale, hard, weathers light gray, slaty, grades into... 0.9 ft. 2 Shale, dark to near-black, lower is greenish and silty 8.2 ft. 1 Red clay and green shale or clay, exposed 10.0 ft.
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