230 The American Geologist. October, ioos 
Recent and Glacial; the Ogallala, Arikaree, and Oligocene 
Tertiaries ; and the Pierre shales of the upper Cretaceous. 
Sections. 
1. Section on the bluff east oi Little Oak Creek, om mile east 01 
the Ring Thunder day School. 
Oligocene: Feet Inches 
1. Yellow thin-bedded, somewhat porous limestone. .. . 40 
Pierre Shales: 
2. Black shale streaked with yellow bands of iron ore. . 10 
3. Black shale, carrying concretions of iron in which 
are occasional Baculite fragments 40 
2. Section in the Bad Lands four miles due east of the Little White 
river issue house. 
Arikaree: Feet Inches 
1. Sand 15 
Oligocene: 
2. Light colored shale 90 
3. White, concretionary stratum 4 
4. Light colored shale having an olive cast when wet. . 5 4 
5. Hard white limestone stratum 6 
6. Brown colored shale 4 
7. Light gray shale, weathering brown 10 
8. Cream colored shale 10 
9. Jointed, very hard, yellow shale 18 
3. Section in a well at Butter Creek. 
Recent: 
1. Yellow clay (bones of the buffalo and deer) 10 
Pierre Shales: 
2. Black to gray shale 12 
4. Section on west side of Oak Creek, eight miles south of Bad 
Nation school house. 
Glacial?: 
1. Light colored clay 10 
2. Gravel 6 
3. Light colored clay 6 
4. Dark clay 1 
5. Cobblestone-gravel stratum 3 
Pierre Shales: 
6. Grayish-black shales . . . : 120 
5. Section in the valley south oi Little White River, one mile above 
the mouth of Cut Meat creek 
