Marshall County Sec. 28, T. 2 S., R. 7 E

East end of Marysville on Highway 36, SW corner of sec 28. Measured By M.K. Elias, 1932 Remarks: IV-13

Unit No. Description Thickness   Holmesville shale formation   25 Shale, greenish, with vertical bands of maroon 2 ft. 24 Shale, greenish to yellow-brown 2 ft. 23 Mudstone to box-work, very calcareous, rusty, brownish-yellow 4 ft. 22 Shale, calcareous, light-gray 2 ft. 21 Mudstone, light-gray, soft 1 ft. 20 Shale, calcareous, light-gray 2 ft. 19 Mudstone, light-gray, soft 1 ft. 18 Shale, calcareous, light-gray 2.5 ft. 17 Mudstone, soft, splittery, light-gray 1.5 ft. 16 Shale, calcareous, light-gray 0.5 ft. 15 Mudstone, soft, light-gray 0.7 ft. 14 Shale, calcareous, light-gray 0.8 ft. 13 Mudstone, light-gray 0.7 ft. 12 Shale, light-gray 0.1 ft. 11 Mudstone, light-gray 0.5 ft. 10 Shale, light-gray 0.1 ft. 9 Mudstone, with a flint band, very fossiliferous with pelecypods and Bellerophon 0.8 ft. 8 Shale, light-gray 0.5 ft. 7 Mudstone, soft 0.6 ft. 6 Shale, calcareous 0.8 ft. 5 Mudstone, soft 1.2 ft. 4 Shale, calcareous 1.5 ft. 3 Mudstone, soft 1.5 ft.   Fort Riley limestone member   2 Mudstone, massive, with large caverns 5 ft. 1 Shale, gray, with small Derbyia, bryoza, Dictyoclostus americanus, and other fossils 3 ft.