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IOWA ACADEMY OP SCIENCE 
7. Shale, gray, calcareous 3 
6. Limestone, blue, weathered yellow and brown 2 
5. Shale, blue 12 
4. Limestone, gray 2 
3. Shale, gray, calcareous 3% 
2. Limestone, gray 2 
1. Shale, blue, with thin layers of sandstone 35 
Total 94 
The lower limestones, numbers two and four, are not con- 
stant as they often grade into a very calcareous shale. Numbers 
six to eight, inclusive, are the Tarkio limestone. The lower 
limestones with the interbedded shale should be included in the 
City Bluffs shale. . This section does not reach down to the upper 
shale, exposed in the outcrop on the wagon road south of the 
cemetery near Elmo, leaving a hiatus of probably not to exceed 
twenty feet, not known in outcrop in Iowa or Missouri. As 
shown by outcrops and drillings the thickness of the City Bluffs 
shale is one hundred and eighty to two hundred feet. 
SECTION AT WEST END OF RAILROAD BRIDGE OVER THE MIS- 
SOURI RIVER AT NEBRASKA CITY, NEBRASKA. 
No. Feet 
12. Thin bedded limestone with shale partings 4 
11. Sandstone, yellow, micaceous 4 
10. Shale, blue 5 
9. Limestone, gray, single layer, thickens to the 
south, Nyman coal cap rock 2 
8. Shale, coaly, black, Nyman % 
7. Shale, blue, arenaceous, and micaceous in places . . 40 
6. Limestone, yellow 2 
5. Shale, weathered 6 
4. Limestone, yellow 1 
3. Shale, weathered 1 
2. Limestone, yellow, in two layers 1 
1. Shale 5 
Total 71% 
This outcrop is one mile below the Nebraska City landing sec- 
tion described by Fielding B. Meek over forty years ago. Num- 
bers two to six, inclusive, are the Tarkio limestone. This section 
is nearly the same as that on Tarkio creek, but in addition it 
reaches higher in the General Section of Todd. 
SECTION IN FIRST RAVINE SOUTH OP ROSE BRANCH, NORTH- 
WEST OP ROCKPORT, MISSOURI. 
No. Feet 
11. Shale, red 5 
10. Sandstone, brown, micaceous, irregularly bedded. . Id 
9. Shales and sandstone with one foot of limestone in 
upper part 35 
