UPPER CARBONIFEROUS OP IOWA 
277 
SECTION AT WEST END OF BRIDGE OVER NODAWAY RIVER. 
No. 
16. 
15. 
14. 
13. 
12 . 
11 . 
10 . 
9. 
8 . 
7. 
6 . 
5. 
- 4. 
3. 
2 . 
1 . 
Feet 
Sandstone, ferruginous 1 
Shale, blue 10 
Shale, yellow, concretionary 2 
Shale, blue 3 
Shale, yellow, concretionary 1% 
Shale, blue 1 
Sandstone, ferruginous % 
Shale, arenaceous, septaria 10 
Sandstone, ferruginous 2 
Limestone and sandy shale in alternate layers .... 5 
Shale, gray, many septaria 30 
Shale, dark blue 25 
Shale, below level of water in river 30 
Limestone, cap rock 2 
Shale 4 
Coal, Nodaway iy 2 
Total 
1281/2 
The forty-seven feet of strata in numbers six to nine, inclus- 
ive, comprise the septarian zone of the City Blulfs shales. Some-^ 
of these septaria reach a diameter of two feet. This outcrop is 
the City Bluffs beds described and named by Garland C. Broad- 
head in the Missouri Geological Keport of 1872. 
COMPOSITE SECTION OP DIFFERENT OUTCROPS SOUTH OF THE 
I. O. O. F. CEMETERY, NEAR ELMO, MISSOURI. 
No. Feet 
8. Shale, gray, weathered yellow 25 
7. Limestone, blue, weathered yellow, cap rock 1 
6. Shale 1/2 
5. Coal, Elmo 1 
4. Underclay i/^ 
3. Shale, weathered yellow 13 
2. Shale, yellow, with nodules of impure limestone. . 2 
1. Shale, weathered yellow, with many large septaria 15 
Total 58 
Number one is the upper member of the septarian zone of the 
City Bluffs shale. The coal, number five, has been named the 
Elmo coal by the Missouri Geological Survey. It is an irregular 
coal, only rarely present, and has long been known in Iowa, 
being first described by E. H. Lonsdale in the Montgomery 
County Keport of 1894. 
COMPOSITE SECTION OF DIFFERENT OUTCROPS ON TARKIO 
CREEK, PAGE COUNTY, IOWA. 
No. , Feet 
11. Limestone, yellow, cap rock 3 
10. Coal, Nyman 1 
9. Shale, variable 30 
8. Limestone, yellow 1 
