Marshall County Sec 16, T. 4 S, R. 7 E.

One mile north of Bull Rapids, NE 1/4 sec 16 Measured by M.K. Elias, 1932 Remarks II-6

Unit No. Description Thickness ft.   Threemile limestone member   45 Limestone with three broad bands of flint. Fenestella and other bryozoa, Phillipsia 5 44 Shale, calcareous, with crinoid joints 0.5   Speiser shale formation   43 Covered 8 42 Shale, green 1 41 Shale, purple 3 40 Shale, green 0.2 39 Shale, purple 1.5 38 Shale, green 0.2 37 Shale, red 1 36 Shale, green 0.5 35 Limestone, light-gray, crystalline 1 34 Shale, green 0.8 33 Shale, dark-purple 1.2 32 Mudstone, light-green, bedded 0.8 31 Shale, green 0.5 30 Shale, purple 1 29 Shale, green 0.5   Funston limestone member   28 Limestone, massive, breaks into large blocks, shows some stratification, contains poor and small fossils, among which are small plump gastropods (Funston limestone) 3.5   Blue Rapids shale member   27 Shale, gray 1.5 26 Shale, almost black, splittery 2 25 Shale, gray 1 24 Shale, very fossiliferous 1.5 23 Limestone, light-gray, fossiliferous 0.8 22 Shale, light-green 5 21 Shale, maroon 0.5 20 Shale, green 0.5 19 Shale, maroon 1.3 18 Shale, light-greenish-gray 0.7 17 Shale, bands of dark-purple and dark green 3 16 Mudstone, cavernous, green, with some blue-green glauconite in caverns 1 15 Shale, gray 1 14 Shale, gray, platy 2   Crouse limestone member   13 Mudstone, green, platy with vertical veinlets of crystalline calcite 1.5 12 Limestone, granular, fossiliferous, with thin veinlets of calcite 1 11 Shale, gray, fossiliferous at the base 3 10 Limestone, fossiliferous, common Pseudomonotis near the base 2.5   Easly Creek shale formation   9 Shale, green 5 8 Shale, red, with a few thin green bands 11 7 Gypsum leached out at the exposure, in the mine 7-8   Middleburg limestone member   6 Limestone with Pseudomonotis, Aviculopecten, Septopora, Allorisma, Juresania nebrascensis 1.3 5 Limestone, impure and platy near the top; same fauna as listed above in the upper half; Pseudomonotis and other pelecypods in the lower half 3 4 Shale, gray, solid 5 3 Shale, red 3 2 Shale, green 1 1 Shale, red 2.5

Blue Rapids shale, 1 1/4 miles north of Blue Rapids, Kansas (Legal location estimated) Measured by Condra and Upp, 1931 (p. 22)

Unit No. Description Thickness ft. 11 Shale, gray, argillaceous; dark and bedded at middle; calcareous and very fossiliferous in basal 1' which carries many specimens of Thamniscus octonarius, and some specimens of Septopora, Derbya, etc. 6 10 Limestone, gray, fossiliferous, with high-spired gastropods, Thamniscus, Polypora, Fenestella, Septopora, etc. 1 9 Shale, gray 1 8 Limestone, gray, blocky, grannular, with gastropods and some ostracods .42 7 Shale, olive colored, with nodular lime at top 1.5 6 Shale, not so plastic as division 5, weathers buff 1.83 5 Shale, red, with some gray 3 4 Shale, gray, with platy seams 1.5 3 Limestone, gray, with crinoid joints in upper portion 1 2 Shale, gray, with some calcareous material 1.5 1 Mudstone, dark gray, bedded, loosely indurated 2.5