1882.] 485 [White. 



beds along the Cheat river canon through Chestnut Ridge and Laurel 

 Hill. 



The sandstone in No. 7 gets quite massive at times, and this portion of 

 the column makes a great bluff along either bank of the river, from which 

 the descent to the stream is almost vertical in many places. 



As will be seen b}^ comparing the sections, the interval between the 

 3fountain Umestojie and the 10' impure limestone above, is in this section 

 just double that in Sec. 3, showing that it is quite variable. 



The Mountain limestone. No. 12, juts out of the bluff in a great cliff at 

 this point, and was once quarried for flux for the old Henry Clay furnace, 

 situated near the head of Quarry run, 



No. 14 seems to be identical with the "Silicious limestone " of Steven- 

 son in Fayette and Westmoreland counties, and is here clearly a portion of 

 No. X, since 10' of Pocono or Vespertine sandstone comes above it. 



No. 16 is a massive, hard, gray sandstone, containing streaks ot small 

 quartz pebbles, and forming an immense cliff along the mountain side. 



About one-fourth mile above the last locality, another section taken on 

 the same (east) bank of Cheat river reveals the following structure 

 (Sec. 5) : 



1. Massive sandstone, and conglomerate, making 



lower half of No. XII 100' 



2. Concealed 50' \ q ^ 



3. Sandstone, flaggy, and current-bedded 160' 



4. Layer of breccia 2' I 



5. Concealed and red shale 40' ^ ^^?' 



6. Limestone, impure 5' 



7. Bed shale, and concealed 35' 



8. Mountain limestone, visible 85' 



9. Concealed 25' 



10. ' ' Silicious limestone," i 10' 



r 



11. Sandstone, massive, pebbly 100' I ^^;- ^ 



12. Concealed with flaggy sandstone at base 175' 



] 



13. Concealed to Cheat river (885' A. T.) 150' 



This section is but a repetition of the preceding one, with slight varia- 

 tions, the Silicious limestone being here 10' thick instead of 5'. It is a 

 light gray rock, containing possibly 40-50 per cent, of lime, and would 

 make as good pavement blocks as that from Westmoreland Co., so exten- 

 sively used in Pittsburgh and vicinity. 



No. 4 is a curious layer of shale, iron ore, and sandstone pebbles ce- 

 mented into a matrix of impure limestone. 



The rocks still rise quite rapidly south-eastward as we approach the 

 Chestnut Bidge axis which crosses Cheat river about one mile and a quarter 

 above the locality of Sec. 5. 



About one-half mile south-east from the locality of the last section, a 

 small rivulet falls over the base of No. XII, and completely exposes the 



