The Chouteau Group — Rowley . 
117 
THE ARTESIAN WELL AT CITY PARK, 
IOWA. 
DAVENPORT, 
By A. S. Tiffany, 
This well is situated 160 feet above low water in the Missis¬ 
sippi, and 688 feet above the sea. 
Drift 100 feet 
1. 
Coal Measures 
0 _ 
30 feet. 
3.- 
Corniferous 
4.- 
390 feet. 
5- 
6. 
7.- 
Lower Helder- 
berg, 80 feet. 
8.- 
Niagara 
9.- 
10- 
175 feet. 
11.- 
Cincinnati and 
12.- 
Trenton, 
13, 
300 feet. 
14.- 
15.- 
Calciferous 
16.- 
17.- 
group 
18.- 
Magnesian 
19.- 
limestone of 
20.- 
the Mo. reports 
21.- 
512 feet. 
22.- 
23.- 
-Loess 40 feet; Boulder clay 60 feet..... 100 
—Dark clay shale.. 
—Hard drab limestone. 
—Cream-colored limestone_ 
-Hard, porous limestone, buff. 
—Drab limestone, hard. 
.... 30 
.... 220 
.... 30 
.... 20 
.... 90 
—Very dark blue calcareous shale.. 30 
-Soft, buff limestone, Le Claire. 80 
-Hard, rough, drab limestone. 50 
-Drab limestone... 75 
-Hard shaly limestone. 50 
—Dark gray limesto e. „. 125 
- Dark drab limestone. 50 
-Soft white limestone. 75 
—Soft white limestone. 50 
-Blue clay shale, with silica. 10 
-St. Peter sandstone, white. 90 
-Arenaceous shale, drab, blue and red... 15 
-Magnesian limestone, with ten per cent, 
silica; cement rock. 210 
-No record. 25 
-Sandstone, (by City engineer).... 10 
-Limestone, (borings washed away). 100 
-Limestone. 262 
1,797 
Note.—N o. 4 contained fossils, viz: Paracyelas tenuis Hall, 
Platystoma turbinatus Hall, Cyrtina hamiltonensis Hall. Olado- 
pora and Pleurotomaria, undetermined; No. 7, contained Panta- 
merella arata Con. or P. papilionensis Hall. 
It appears that 80 feet or more were eroded from the Cor¬ 
niferous before the coal shales were deposited. The upper 80 
feet of the Corniferous at this place have well marked litho¬ 
logical features, which could be readily recognized in the 
130 
350 
380 
400 
490 
520 
600 
650 
725 
775 
900 
950 
1,025 
1,075 
1,085 
1,175 
1,190 
1,400 
1,435 
