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

1/2 mile east of Frankfort, NE corner sect. 21 Measured By M.K. Elias, 1932 Remarks I-10
	Unit No. Description Thickness   Upper Hughes Creek shale member   12 Shale, gray, calcareous near the base 1.5+ ft. 11 Limestone with Ambocoelia, Composita, Marginifera, Juresania, Allorisma, and Schizostoma 0.8 ft. -- Shale, black 1.5 ft.   Vliets limestone bed   10 Limestone, with numerous small Bellerophon at the top 0.2 ft.   Lower Hughes Creek shale member   9 Shale, gray with Meekopora and fusulinids in the middle and Marginifera near the base 5 ft. 8 Mudstone 0.5 ft. 7 Shale, gray with Chonetes, Ambocoelia, Rhipidomella carbonaria, and Linoproductus 0.5 ft. 6 Limestone, with Linoproductus at the top 1 ft. 5 Shale, gray 1 ft. 4 Shale, dark-gray 2 ft. 3 Shale, dark-gray to black 1 ft. 2 Mudstone, gray, some fossils (Spirifer) 2.5 ft. 1 Shale, gray 1 ft.
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