Logan County Sec. 21, T. 15 S., R. 32 W

Measured By H. Miller and E. Gutentag
	Unit No. Description Thickness   Niobrara   23 Chalk - gray 0.6 ft. 22 Chalk - yellow, fissile 0.05 ft. 21 Chalk - gray 1.9 ft. 20 Chalk - yellow, clayey 0.35 ft. 19 Chalk - gray, with some small partings 6.5 ft. 18 Chalk - fissile 0.05 ft. 17 Chalk - gray 0.75 ft. 16 Chalk - yellow and fissile 0.05 ft. 15 Chalk - gray 1.6 ft. 14 Shale - yellow, fissile with some siltstone 0.2 ft. 13 Chalk - gray 2.65 ft. 12 Bentonite - sandy 0.1 ft. 11 Chalk - gray 1 ft. 10 Bentonite 0.1 ft. 9 Chalk - gray 0.85 ft. 8 Bentonite 0.1 ft. 7 Chalk - gray 0.9 ft. 6 Bentonite - sandy 0.11 ft. 5 Chalk - gray 0.35 ft. 4 Bentonite - sandy 0.25 ft. 3 Chalk - gray 0.6 ft. 2 Bentonite - limonitic, sandy 0.05 ft. 1 Chalk - gray, to stream bed 1 ft.
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