1 62 STRATIGRAPHY THE ALLEGHENY SERIES. 



THE UPPER FREEPORT SANDSTONE. 



The Upper Freeport Sandstone, named by Pennsylvania 

 geologists from its occurrence in that State, occupies a con- 

 siderable portion of the interval between the Upper and Lower 

 Freeport Coals. It is usually a hard, massive, gray stratum, 

 often making cliffs. In Chapter IV its presence is noted in 

 numerous sections. 



THE LOWER FREEPORT COAL. 



The Lower Freeport Coal, of the First Geological Survey 

 of Pennsylvania, belonging about 50 feet below the Upper 

 Freeport, is of scanty occurrence in southern Lewis, where its 

 horizon crops, having been noted at only a few localities. It 

 .may be disregarded entirely as a commercial coal. 



The Lower Freeport Coal was opened at Prospect No. 

 248 on Map II, on Glady Creek, 2.9 miles northeast of Duffy, 

 at an elevation of 1290' B., but this place had fallen shut and 

 the coal could not be measured. 



At Prospect No. 249 on Map II, on Glady Creek, 3.2 miles 

 northeast of Duffy, the coal was opened at an elevation of 

 1310' B., but the place had fallen shut. 



Another opening was made at Prospect No. 250 on Map 

 II, on Glady Creek, 0.5 mile northeast of Duffy, at an elevation 

 of 1305' B., but apparently little coal was found. 



Another attempt was made to mine this coal at Prospect 

 No. 251 on Map II, on Glady Creek, 0.3 mile northwest of 

 Duffy, at an elevation of 1240' B., but the digging had fallen 

 shut. 



THE LOWER FREEPORT SANDSTONES. 



The Lower Freeport Sandstone, named by Lesley from its 

 occurrence in Pennsylvania, where it is described as being 

 composed of two separate divisions, the Upper and Lower, 

 separated by the Upper Kittaninng Coal, and belonging only 

 a few feet below the Lower Freeport Coal horizon, is of gen- 

 eral occurrence in southern Lewis where it crops. In this re- 

 gion it is everywhere divided into the two ledges, having the 

 Upper Kittanning Coal between them. 



