256 
REPORT OF THE AMERICAN COMMITTEE. 
1. Upper Coal Measures. 
2. Middle Coal Measures. 
3. Lower Coal Measures. 
TABLE. 
Upper Carbonic. 
r Permo-carbonic. 
I Monongahels 
j Pittsburgh. 
I Allegheny. 
-{ Quinnimont. 
1, Greenbrier. 
2. Pocono. 
Lower Carbonic. 
f Chester. 
< St. Louis. 
V Keokuk. 
f Burlington. 
1 Kinderhook. 
