Marshall County Sec. 31, T. 4 S., R. 10 E

SE 1/4 SE 1/4 sec 31 Measured By M.K. Elias, 1932 Remarks I-12,13
	Unit No. Description Thickness   Upper Hughes Creek shale member   19 Fossil wood, a heavy log -- ft. 18 Covered 5 ft. 17 Limestone, tough, gray, with fusulinids, Composita on the top 0.9 ft. 16 Covered 3 ft. 15 Limestone, with Bellerophon projecting into the shale above on the top 0.1 ft.   Lower Hughes Creek shale member   14 Covered 2.5 ft. 13 Shale, calcareous, with Rhipidomella carbonaria 0.3 ft. 12 Shale, calcareous, with fusulinids 0.3 ft. 11 Shale, calcareous 0.6 ft. 10 Limestone, with Linoproductus on top 0.2 ft. 9 Limestone, with Pinna, Myalina, Allorisma, nautiloids; also Derbyia at the base 0.8 ft. 8 Shale, gray, fossiliferous, Rhipidomella at base 5 ft. 7 Shale 9.5 ft.   Americus limestone member   6 Limestone, tough 1 ft. 5 Shale 1.5 ft. 4 Limestone, algal 0.2 ft. 3 Shale, gray, splittery 1.3 ft. 2 Limestone, light-gray, tough, no fossils 0.4 ft. 1 Shale, clayey, yellowish 2.5+ ft.
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