80 
The American Geologist. 
August, 189a 
Vertical Section of the Borings of the St. Louis, Missouri, 
Insane Asylum Well. 
System. 
Series. 
Formation. 
Description. 
Thick- Total 
ness | from 
in feet, surface 
Quaternary . 
s> c i 
■I .2-2 
.2 s-S 
g.2-DQ 
Loess. . . 
Marly clay 
40 
80 
670 
93 
40 
Lower Carbonifr's 
Chouteau Group. . 
Trent., Black Riv. 
and Birdseye.? 
First Magn, lime. 
First Sandstone.. . 
Sec'nd Magn.lime. 
Third Sandstone. . 
Clay and limestone, 
21 ft 
Coal, clay and lime 
stone, 25 ft 
Shales, limestone,c<>al 
and clay, 34 feet. 
Limet-toDe with chert 
Limestone with chert 
Limestones .... 
120 
7: in 
883 
Lower 
Silurian 
Limestones . . . 
421 
148 
133 
517 
82 
487 
172 
37 
142 
98 
13 
371 
41 
13 
285 
1304 
1452 
DO 
.2 
Oi 
m 
a, 
u 
CO 
N 
o 
Saccharoidal 
L585 
2102 
£ 
2184 
< 
Limestone and chert 
Limestone and sand 
stone (?)... 
2071 
t— i 
pq 
Third Magnesian 
limestone and its 
extension down- 
ward. 
2843 
< 
Sandstone 
Limestone 
2880 
3022 
o 
Sandstone 
3120 
P3 
PM 
D 
Magnesian slate 
Magnesian limestone. 
Some sandy beds at 
lower part. 
Sandstone 
3133 
3504 
3545 
Limestotie 
Sandstone with gran- 
ite and feldspar peb- 
bles (?) 
3558 
3843 
Lower Silurian. This may include Hudson River, Trenton 
and Black River beds. 
No. 1. The Hudson River occurs as flagstones and shales 
in Lincoln and Pike and may be the source of the sulphur 
springs of those counties. 
No. 2. The Trenton includes about 30 feet in the upper 
part of whitish limestone, the lower beds somewhat brown. 
These beds are often cavernous and are the equivalent of the 
Galena limestone of Illinois and Iowa, but in Missouri they 
arc not lead-bearing. The chief fossils are Chattites Ly coper 
don, Receptaculites and Orthis Testu dinar ia. I have not found 
the Receptaculites cither above or below. On account of its 
presence Dr. Shumard applied the name Receptaculite to the 
limestone. It is found in Ralls, Pike, Lincoln. St. Charles. 
