Whit*.] 



484 



[Oct. 20, 



The limestone, No. 4, of the above section, is quite impure, having a brec- 

 ciated appearance, and is fossiliferous, Spirifers aitd Producti being espe- 

 cially numerous. No. 7 was once extensively quarried at this locality, and 

 used for flux at the old charcoal furnaces near Ice's Ferry. It is quite 

 pure, making a beautiful white lime much valued for plastering purposes. 

 It is possible that some portions of the stone might be successfully em- 

 ployed as a flux in the manufacture of glass. 



The thin calcareous shale, No. 8, is a perfect mass of fossils, among 

 which Allorisma clavata, Hemipronites crassus, Athtjris subtilita, A. subqua- 

 drata, Spirifer Keokuk, Productus cora, and Grinoidal fragments are most 

 numerous. 



Continuing south-eastwards up the river, the rocks still rise with great 

 rapidity, and at one mile and a half above the last locality, only 2^ miles 

 from where the top of No. XII first emerges from the bed of Cheat, we get 

 the following succession in descending the almost vertical wall on the 

 right bank of the river (Sec. 4) : 



Very massive pebbly sandstone 20' 



Concealed 80' 



Sandstone, massive, coarse 20' 



Concealed 45' 



Shales and concealed 20' 



Red shale 10' 



Sandstone, greenish, current-bedded 165' 



Bed, and green shales and concealed 50' 



Limestone, impure 10' 



Shales, green and red 25' 



Flaggy sandstone and shales 15' 



Mountain limestone, in layers I'-IO' thick 



separated by thin calcareous shales 95' 



Sandstone, finely laminated, and containing 



pebbles of limestone. 10' 



" Silicious limestone, " grayish-white 5' 



Sandstone, flaggy 10' 



Sandstone, massive, pebbly, cui-rent-bedded 80' 



Concealed to level of Cheat river (875 A. T.) 200' 



No. XII. 

 165' 



O g 



295' 



No. X. 

 305' 



I have placed the base of No. XII in this section, 45' below tlie top 

 of the concealed interval, since the band of red shale. No. 6, is evidently 

 identical with the one in Sec. 2, which comes 20' below the base of XII. This 

 gives a thickness of 165' for the latter at this locality, and since 10'-15' have 

 been eroded from its top, the group when complete would have about the 

 same thickness as found in Sec. 2 (177'). 



The Mauch Chunk shale foots up a thickness of 295' at this locality, 

 which is 80 near that given by tlie combined section and boring in Sec. 2 

 (300'), that the latter figure maybe taken as the average thickness of these 



