Marshall County Sec 16, T. 3 S, R. 7 E.

Section at bridge across Creek 3 miles south of marysville on the West side of the Big Blue River (Legal location estimated) Measured by Beede and Sellards, 1905 (p. 89-90)

Unit No. Description Thickness ft. 28 Limestone 5+ 27 Covererd 10 26 Limestone, shaly 3 25 Limestone with fossils and a little chert 2 24 Shales, yellow, with fossils 1.4 23 Limestone with 3 to 4 layers of concretionary chert 3.33 22 Shale, calc, or marl .75 21 Limestone with with thick chert layer below and 4" layeer in upper part 2 20 Limestone with 7 layers of concretionary chert 5.5 19 Limestone with 4 layers of concretionary chert 4 18 Shales, fossiliferous, equals layers below flint at Marysville 0.5 17 Limestone, argillaceous 3 16 Shales, red and green with sandstone layer 14 15 Sandstone, soft red 1.25 14 Shales, clayey, blue, olive, and green 19 13 Limestone, bl 1 12 Shales, blue clayey 3 11 Talus, by barometer 25 10 Shales, green, showing in creek bank 1.5 9 Covered, creek bed 3 8 Limestone, gray clayey 2 7 Limestone, very compact with smooth fracture, solid geodes 1 6 Limestone, very dark blue argillaceous 5 5 Limestone, 6" to 1', with fragments of fossils beneath bridge 1 4 Chert 0.41-0.5 3 Limestone, blue with fragments of fossils 0.5 2 Chert 0.33 1 Limestone, thin layers below high water at the mouth of the creek. Farther out int he river a layers of chert may be seen at low water