CONEMACGH FORMATION OF FIRST PENNSYLVANIA BASIN 167 



in the same area. The Conemaugh is 600 feet thick and contains many 

 coal beds and limestones, several of which can not be correlated with any 

 beds in basins farther west. A sandstone, apparently the Morgantown, 

 and 77 feet thick, rests on the Elk Lick coal bed, which at the typical 

 locality overlies the Elk Lick limestone, 8 feet thick. At about 80 feet 

 lower is a limestone which Doctor White correlates with the Ames. It is 

 from 300 to 320 feet below the Pittsburg coal bed and overlies a thin coal 

 correlated with the Harlem. The Brush Creek coal bed is at 100 feet 

 above the Upper Freeport, and at a few feet higher is a limestone which 

 has been correlated with the Brush Creek. This immediately underlies 

 a thin coal bed, the Philson of W. G. Piatt. All of the limestones are 

 non-fossiliferous. These coal beds and limestones seem to be persistent 

 in the northwestern part of the county and 2 feet of red shales are asso- 

 ciated there with the Ames limestone, the most northerly appearance of 

 the "Pittsburg reds." Farther south on this west side, near Bakersville, 

 Mr Piatt found a dark fossiliferous limestone, evidently the Brush 

 Creek, while still farther south are two limestones, 60 to 70 feet apart, 

 of which the upper is clearly the Ames, as shown by its fossils as well as 

 its physical character, while the lower may be at the Cambridge horizon. 



A compiled section in the southwestern part of the county shows the 

 Brush Creek coal bed (Rose of F. Piatt) at 263 feet below the Elk Lick 

 limestone and 105 feet above the Upper Freeport. The coal bed under- 

 lies black shales with calcareous nodules, representing the Brush Creek 

 limestone and black shale. The intervals decrease southwardly and 

 westwardly; at Confluence, near the western border, the interval between 

 Elk Lick limestone and Upper Freeport is 345 feet, but within five miles 

 eastwardly it increases to 375 feet.* 



Passing over into Garrett county of Maryland, one finds Mr Martin's 

 section on Castleman river, in the Salisbury subbasin, and another at 

 Friendsville, in the Johnstown subbasin. 



In the former the Little Pittsburg coal bed is present, but without its 

 limestone, and a thin coal bed at 137, the same with that seen by W. G. 

 Piatt in Somerset county, may be the Little Clarksburg. The Ames 

 limestone at 328 feet below the Pittsburg is present with all its charac- 

 teristic features and overlies directly the Harlem coal bed (Friendsville 

 of Martin). The Barton (Bakerstown) coal bed is here and red shales 

 appear 50 feet below it at the horizon of those seen in eastern part of 

 Cambria. The Brush Creek limestone (Lower Cambridge) is dark 



* F. and W. G. Piatt: (H 3), pp. 23, 40, 63, 76, 179, 223, 239, 244, 258, 266, 282. 

 I. C. White: U. S. Geol. Survey Bull. no. 65, p. 76. 



