274 
IOWA ACADEMY OF SCIENCE 
13. Limestone in thin layers, light yellow and gray.. 12 
12. Shales, mostly gray, some red and blue, with five 
thin layers of limestone and four of sandstone 185 
11. Bluish limestone, interstratified with black shales 
and one foot of coal near center. 12 
10. Drab clays enclosing three strata of limestone, two 
to four feet thick 30 
9. Compact limestone, mostly thin bedded, and some 
layers stylolitic 20 
S. Blue clays, carbonaceous at two levels, and with 
two thin limestones 12 
7. Soft, fine-grained, yellow sandstone 12 
6.. Clays and shales, bluish and gray, with three or • 
four limestones, one much the thickest, some- 
times seven feet thick..... 45 
5. Limestone, yellow and gray, with many Fusulina 20 
4. Clays, ash and red, with black shale in middle 6 
3. Yellowish, soft sandstone 4 
2, Limestone, very fossiliferous 10 
1. Greenish and chocolate clays above, and shales 
below to level of Missouri^river at Plattsmouth 25 
Total 460 
Number eleven of the above includes the cap and bottom rocks 
of the Nodaway coal, and the limestone in number fourteen is 
the cap rock of the Nyman coal. 
This series of strata has been divided into different forma- 
tions by the Iowa Geological Survey as follows, commencing with 
the uppermost: 
McKissick’s Grove shales. Forbes limestone. 
Tarkio limestone. Platte shales. 
City Bluffs shale. Plattsmouth limestone. 
Braddyville beds. Andrew shales. 
COMPOSITE SECT-ION OP THE OUTCROPS RECORDED IN THIS 
REPORT. 
McKissick’s Grove shales 
Tarkio limestones 
City Bluffs shale. 
Nodaway coal 
Braddyville beds 
Forbes limestone 
Platte shales 
Plattsmouth limestone . . 
Nos. OF Todd’s 
Feet 
Section 
80 
14, 15, 16 
12 
13 
200 
12 
11/2 
*11 
45 
10 
20 
9 
70 
6, 7, 8 
20 
5 
Total 
448% 
*Includes cap and bottom rocks. 
All the following outcrops have been examined by the writer, 
and most of them in company with the late Doctor Calvin. They 
