Marshall County Sec 9, T. 4 S, R. 8 E.

South of center SE 1/4 sec 9, north of the road Measured by M.K. Elias, 1932 Remarks III-8

Unit No. Description Thickness ft.   Schroyer limestone member   15 Flint 1.5 14 Limestone with two bands of flint 1.5   Havensville shale member   13 Shale 1 12 Mudstone 0.5 11 Shale, green 3.5 10 Mudstone, with Pinna and Allorisma 1.5 9 Mudstone, splitteryl Derbya, Pinna, and small Composita at the top 3.5 8 Shale, calcareous at the top 9   Threemile limestone member   7 Limestone with flint band 1.2 6 Limestone 0.8 5 Covered 1.5 4 Limestone with flint band in upper part; Composita 1.1 3 Shale, calcareous 0.3 2 Limestone with flint band, Composita 0.8   Speiser shale formation   1 Shale, gray 1