Marion County Sec. 4, T. 17 S., R. 2 E

On East side of Highway between Durham and Elmo Measured By M.K. Elias, 1935
	Unit No. Description Thickness 31 Mudstone, splittery + 1 ft. 30 Shale, gray 8.5 ft. 29 Shale, calcareous, splittery 1 ft. 28 Shale, gray 2.5 ft. 27 Mudstone, splittery 0.3 ft. 26 Shale, gray; lower half gray to dark gray, splittery 9.2 ft. 25 Limestone, rusty, irregular 0.1 ft. 24 Shale, dark gray 0.4 ft. 23 Mudstone 0.5 ft. 22 Shale, gray 5 ft. 21 Mudstone, splittery 1 ft. 20 Shale, gray 1 ft. 19 Mudstone, two thin beds 0.4 ft. 18 Shale, gray 0.3 ft. 17 Mudstone, splittery 0.3 ft. 16 Shale, dark gray 2.9 ft. 15 Mudstone, tough 0.1 ft. 14 Shale, gray 2 ft. 13 Limestone, tough, flaggy, with "salt-hoppers" 0.3 ft. 12 Covered (mostly shale) 5.7 ft. 11 Shale with two thin mudstone beds 0.8 ft. 10 Limestone, finely splitting; microfauna 0.2 ft. 9 Shale, dark gray 1.9 ft. 8 Limestone, hard, with fish scales and poor plant fragments 0.1 ft. 7 Shale, light gray to yellowish 11 ft. 6 Gypsum veins (horizontal) 0.2 ft. 5 Shale, gray with some gypsum 0.8 ft. 4 Gypsum, dark gray with white viens 1 ft. 3 Shale, greenish; purplish at the base 0.5 ft. 2 Gypsum, dark gray, with white veins 1.5 ft. 1 Shale, clayey, gray, Greenish to purplish at top, where also are few gypsum veins 1 ft.
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