302 
The American Geologist. 
November, 1901. 
able degree, even between rock successions of different 
provinces. Even the principle of orotaxial correlation* is 
found to be so nicely applicablef tnat its wider extension must 
be productive of results wholly unlocked for. 
A general section of the Carbo'niferous of the Mississippi 
valley is as follows : 
General Geological Section of the Carboniferous of the 
Mississippi Valley. 
SElvIES. 
TERRA NES. 
THICKNESS FT. 
Cimanan 
Kiger shales 
Salt Fork shales 
250 
500 
Wellington shales 
200 
Oklalwmaii 
Marion limestones 
Chase limestones 
ISO 
200 
Neosho shales 
150 
Cottonwood limestone 
10 
Atchison shales 
500 
>^* 
Forbes limestones 
30 
w 
Platte shales 
150 
Plattsmouth limestones 
30 
> 
Missonrian 
Lawrence shales 
300 
Stanton limestones 
■ 35 
D 
Parkville shales 
100 
u 
f^ 
lola limestones 
50 
w 
Thayer shales 
75 
z 
O 
Bethany limestones 
100 
Marais des Cygnes shales 
250 
C^ 
Dcs Moiiics 
Henrietta limestones 
75 
< 
r ) 
Cherokee shales 
300 
Sebastian 
1800 
Spadra 
500 
Norristown 
400 
Arkoiisan 
Boonville 
2500 
Appleton 
1300 
Danville 
2000 
Millstone grit 
500 
Kaskaskia 
200 
M{ssissipp!a)i 
St. Louis 
Augusta 
300 
250 
Chouteau 
100 
•American Geologist, vol. xvii, 1896. pp. 289-302. 
\Bull. Geol. Soc. America, vol. xii, 1901, pp. 173-196. 
ij U 
