250 
COAL MEASURES. 
Section of Coal Strata at Wheeling, Va. 
Feet. Fig. 46. 
10 r^^^^^^^ 1. Yellowish clay. 
12 ^' ^^^^ ^^^^ — argillaceous and 
slaty. 
3. Silicious rocA:— resembles horn- 
stone. 
4. Clay^ or argillaceous deposite, 
with nodules of hmestone. 
5. Sandstone — fine-grained, used 
for grindstones. 
6. Coal. 
7. Limestone roclc, 
8. Bituminous Coal. 
1 "^^^0 9. Slate clay. 
10. Coal. 
^ ^^^^^^^0^ Slate clay, 
12. Limestone rock. 
60 
182^2 
J 
^13. Sandstone rock, 
14. Slaty clay, 
15. Bed of Ohio river. 
Note. — A mile and a half from this section, a bed of coal 12 
feet thick crops out from the side of a hill at such an angle of 
elevation, that, were it continued, it would be at the height of 
goo feet ^bove stratum No. 1 of the series ! 
