CONEMAUGH FORMATION OF SECOND PENNSYLVANIA BASIN 169 



siindstone in the interval to the Upper Freeport, while in a fourth the 

 bottom of the upper sandstone is at 141 feet, the interval containing 

 aside from shale three thin coal beds at 25, 75, and 141 feet.* The two 

 sandstone plates are apparently the same with those seen near by in 

 Clearfield, but the intervening shales have become thicker, so that the 

 Mahoning in two of the sections is about 220 feet thick instead of 120, 

 as in Clearfield. The several coal beds may be taken as representing the 

 Gallitzin horizon, and in following the section southward this interpre- 

 tation will be accepted. 



In northeastern Indiana county, west from Cambria, Mr Piatt found 

 at 4 or 5 miles west from the area of Mr d'Invilliers' sections a coal bed 

 at 90 feet above the Upper Freeport, separated by 40 feet of shale from 

 the massive "Mahoning" sandstone which rests directly on the Upper 

 Freeport. At a mile or so farther west he saw a coal at 60 feet above 

 that coal bed, and at a little distance farther measured this section : 



Feet. Inches 



1. Thin sandstone and sandy shale 47 



2. Slates 5 



3. Philson coal bed [Upper Gallitzin] 3 1 



4. Concealed 50 



5. Gallitzin coal [Lower Gallitzin] 3 



6. Mahoning sandstone [Lower Mahoning] 65 



173 1 



to the Upper Freeport coal bed, the same with the Cambria condition. 

 No trace of any higher coal bed was seen. About 8 miles farther south 

 and 3 miles west from the Cambria line the section reaches to a massive 

 sandstone which Mr Piatt correlates with the Morgantown. It is prob- 

 able that here, as in northern Westmoreland, that sandstone is continuous 

 downward to the Ames horizon, and that the coal bed here called Elk 

 Lick is in fact the Harlem. At 130 feet below this coal bed is a Black 

 Fossiliferous limestone, 212 feet above the Upper Freeport. The Black 

 limestone overlies a mass of limestone and shale 26 feet thick, its bottom 

 35 feet above a thin coal bed. The whole mass represents the Brush 

 Creek limestone, while at 65 feet higher is a thin limestone which may 

 be at the Cambridge horizon. The Brush Creek and Upper Gallitzin 

 coals are at 152 and 120 feet above the Upper Freeport. Three or four 

 miles southwest on the Conemaugh river the section is: 



* E. V. d'Invilliers : Final Summary Report, pp. 418, 419. 



