C0A1 MEASURES. 



Section of Coal Hill, Pittsburg, Pa. 

 Fig. 47. 



Feet 



20 1 /^^^^f, J- Reddish brown argillaceous earth. 



30 I =1 ^- Sandstone — slaty, fine-grained, 



; = ash-coloured. 



* — 3 - "■sssyr* carbona - 



6 -fe'vjVf^ii:^: 4. C7<*y- — dark- coloured, carbona- 

 ceous, 



5. Coal — bituminous; supplies 

 the manufactories of Pitts- 

 burg. 



5 6# — dark, slaty. 



10 EE: 7. Sandstone. 



l0 'WM9M> 8 * Limestone — dark-coloured. 

 ^^^^^ 9. Sandstone— light-coloured and 

 Il» alliaceous, with impres- 



10. Limestone — light-col'd, hard, 



-compact. 

 11 Sandstone — fine-grained, com- 



_ pact, good building-stone. 



270 = Salt water is obtained by 



boring through this rock. 



