UPPER CARBONIFEROUS OP IOWA 275 
will be given in the order most favorable for explaining the re- 
lations of the different outcrops. 
OUTCROP EXPOSURE AT ROCK BLUFF, NEBRASKA. 
No. Feet 
14. Yellow limestone; Forbes 15 
13. Yellow shale 1% 
12. Gray limestone 1 
11. Shale, carbonaceous 2 
10. Gray limestone 2 
9. Concealed . . ; 30 
8. Limestone, gray 3 
7. Concealed 10 
6. Limestone, disintegrated 5 
5. Limestone, gray 1 
4. Shale, blue, weathered 8 
3. Limestone, chips, weathered 5 
2. Shale with bands of limestone, weathered 10 
1. Limestone, yellow and gray; Plattsmouth 20 
Total 1131/2 
This is the only known outcrop showing the full thickness of 
Platte shales. It is not in good condition at the present time, 
as much of it is concealed by slides and talus. 
WILSON SECTION, TWO MILES NORTH OF THURMAN, IOWA. 
No. Feet 
26. Shale, black 1 
25. Limestone, with a shale 2^ 
24. Shale, yellow .... 1% 
23. Shale, black 1% 
22. Shale, gray, calcareous li^ 
21; Shale, black 1 
20. Shale, gray, calcareous 1% 
19. Coal, Nodaway 1 
18. Shale, blue 2 
17. Limestone, blue 4 
16. Shale, gray, calcareous. 6 
15. Limestone, gray 4 
14. Shale, gray 6 
13. Limestone, blue 1% 
12. Shale, gray, calcareous 4 
11. Limestone, yellow, cherty 2t^ 
10. Shale, gray 3 
9. Limestone, gray 1 
8. Shale, yellow 2 
7. Limestone, gray, in four benches; Forbes 21 
6. Shale, carbonaceous 2% 
5. Limestone % 
4. Shale, carbonaceous 2l^ 
3. Limestone, blue 2 
2. Shale, blue 4 
1. Sandstone, micaceous 1 
Total 
83 % 
