Marshall County Sec. 22, T. 2 S., R. 7 E

West of center NW 1/4 sec, 1 mile north of Marysville Measured By M.K. Elias, 1932 Remarks: IV-14

Unit No. Description Thickness   Towanda limestone formation   31 Limestone, soft, very porus, bedded, resembling coquina 1 ft. 30 Shale 3.2 ft. 29 Limestone, tough, gray 1 ft. 28 Mudstone, cavernous, yellowish 1 ft. 27 Shale, yellowish-gray 7 ft.   Holmesville sh formation   26 Shale, calcareous, splittery, maroon 2 ft. 25 Shale, green 1.2 ft. 24 Shale, calcareous to mudstone near the base, maroon 4 ft. 23 Limestone, crystalline, yellowish-gray, tough, cavernous 2 ft. 22 hale, yellowish-green 1 ft. 21 Shale, maroon 1.5 ft. 20 Shale, yellowish-green 1.8 ft. 19 Limestone, crystalline, very cavernous, yellow 4.3 ft. 18 Shale, calcareous to very soft mudstone 10 ft. 17 Mudstone, yellow-gray, with numerous pelecypods (Pleurophorus?) 1 ft. 16 Shale, calcareous to very soft mudstone 4.5 ft. 15 Mudstone with few pelecypods (Pleurophorus?) 1 ft. 14 Shale, calcareous 1 ft.   Fort Riley ls member   13 Mudstone, massive, porus, yellowish, with Derbyia, crinoid joints, echinoid remains 3 ft. 12 Mudstone, gray, cavernous 1 ft.   Oketo sh member   11 Shale, calcareous, with Derbyia, Aviculopecten and other poorly preserved pelecypods 1.5 ft. 10 Shale, blueish-gray 4.5 ft. 9 Shale to splittery mudstone at the base, quartz geodes in the lower part 2 ft. 8 Mudstone with quartz geodes 2 ft. 7 Shale, blueish-gray 4 ft.   Florence ls member   6 Mudstone with quartz geodes 2 ft. 5 Limestone, largely replaced by flint 2 ft. 4 Shale, calcareous 3 ft. 3 Limestone, largely replaced by flint 4 ft. 2 Shale, calcareous, with quartz geodes 1 ft. 1 Limestone, largely, replaced by flint 9 ft.