Dickinson County Sec. 18, T. 16 S., R. 4 E

Measured By M.K. Elias, 1932
	Unit No. Description Thickness   Hollenberg Limestone Member   16 Limestone, yellow, cavernous with microfauna 3.0 ft. 15 Shale, knotty, calcareous 1.6 ft. 14 Limestone, light gray, crystalline 0.4 ft.   Pearl Shale Formation   13 Shale, greenish-gray 18.0 ft. 12 Shale, purple 0.3 ft. 11 Shale, bluish-green 0.8 ft. 10 Shale, maroon 1.0 ft. 9 Shale, green, calcareous, splittery 0.9 ft. 8 Shale, green 1.0 ft. 7 Shale, calcareous, splittery 1.0 ft. 6 Limestone 0.5 ft. 5 Mudstone, splittery, light-green to purple 2.1 ft. 4 Shale, green 2.3 ft. 3 Mudstone, green 0.3 ft. 2 Shale, green 3.1 ft.   Herington Limestone Member   1 Limestone 1.0 ft.
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