Marshall County Sec. 21, T. 4 S., R. 9 E

1/2 mile south of Frankfort, on the highway Measured By M.K. Elias, 1932
	Unit No. Description Thickness   NEVA LIMESTONE FORMATION   58 Limestone--fossiliferous 2.0 ft. 57 Mudstone--splittery, softer toward top, crinoid joints 2.0 ft. 56 Shale--calcareous, splittery, numerous Triticites ventricosus about one foot from top and numerous Ambocoelia planocovexa 1.5 to 2 feet below top 3.0 ft. 55 Limestone 0.5 ft. 54 Shale--gray 1.5 ft. 53 Limestone 0.5 ft. 52 Shale--gray, Spirifer and small Chonetes near the base 1.5 ft. 51 Mudstone--splittery, same fossils as above 0.5 ft. 50 Limestone--fossiliferous 1.2 ft. 49 Shale--gray 0.8 ft. 48 Limestone to mudstone--splittery 2.0 ft. 47 Shale--gray 5.0 ft. 46 Mudstone--light gray, somewhat cavernous and banded, microfossils (ostracodes?) near top 1.0 ft. 45 Mudstone--light gray, massive 2.0 ft. 44 Shale--gray, to fissile dark gray 2.5 ft. 43 Limestone--dark gray, somewhat earthy, Juresania and Myalina 1.0 ft. 42 Limestone--dark gray, fossiliferous 1.5 ft. 41 Limestone--dark gray, banded 0.5 ft. 40 Shale--gray 0.5 ft. 39 Limestone--gray, somewhat earthy, Aviculopecten 1.5 ft. 38 Shale--greenish gray, few purple spots 2.0 ft. 37 Shale--chalky, greenish white, irregular weathering 4.5 ft.   ROCA SHALE FORMATION   36 Shale--light green 0.5 ft. 35 Shale--purple with dark bluish green spots 4.0 ft. 34 Shale--greenish, few purple and dark green spots near top, calcareous in middle 10.0 ft.   HOWE LIMESTONE MEMBER   33 Mudstone--massive, light green 1.5 ft. 32 Clay--green, fine, sandy 5.5 ft. 31 Limestone--implure, canvernous, roughly weathered, a net of calcite and quartz veinlets, orange ochre between veinlets 1.0 ft. 30 Shale--chalky, splittery 3.0 ft. 29 Shale--calcareous, gray 1.5 ft. 28 Shale--dark gray, Orbiculoidea 1.0 ft. 27 Shale--black, fissile 2.0 ft. 26 Shale--gray 0.7 ft.   GLENROCK LIMESTONE MEMBER   25 Limestone--hard, yellowish, full of fusulinids 2.5 ft.   JOHNSON SHALE FORMATION   24 Shale--gray, chalky nodules 1.0 ft. 23 Mudstone--gray 1.0 ft. 22 Shale--gray 1.5 ft. 21 Mudstone--splittery 2.0 ft. 20 Shale--yellowish gray 12.0 ft.   LONG CREEK LIMESTONE MEMBER   19 "Boxwork"--crystalline, with yellow ochre 5.0 ft. 18 Covered 3.0 ft. 17 "Boxwork"--crystalline, with yellow ochre 3.0 ft.   UPPER HUGHES CREEK SHALE MEMBER   16 Shale--gray 6.0 ft. 15 Shale--with Triticites ventricosus 2.0 ft. 14 Mudstone--fossiliferous 0.2 ft. 13 Shale--gray 2.3 ft. 12 Limestone--tough, fossiliferous, Marginifera at top 0.3 ft. 11 Shale--gray 1.0 ft. 10 Mudstone--fossiliferous 0.3 ft. 9 Shale--gray, with fragmentary fossils 1.5 ft.   VLIETS LIMESTONE BED   8 Limestone--on top numerous Bellerophon 0.2 ft.   LOWER HUGHES CREEK SHALE MEMBER   7 hale--gray, very fossiliferous: Chonetes, Spirifer, Ambocoelia, Dictyoclostus, crinoid joints 4.8 ft. 6 Limestone--tough, gray, with Chonetes, Ambocoelia, and other brachiopods 0.7 ft. 5 Shale--gray 1.7 ft. 4 Sandstone--fine-clayey 0.8 ft. 3 Shale--gray 1.6 ft. 2 Limestone--with Spirifer, Chonetes, crinoid and echinoid remains 0.1 ft. 1 Shale--yellow-green to gray 3.0 ft.
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