Maryland Geological Survey 383 



This conglomerate in lithologic appearance, manner of breaking, and 

 shape of pebbles resembles fairly well the conspicuous one on the ridges 

 near Mountain Lake Park and Oakland. As already stated it is in the 

 line of strike with the very similar conglomerate described on the 

 National Road and still farther southwest near Avilton To the northeast 

 of this belt, as far as the writer is aware, there is no detailed description of 

 the Upper Devonian rocks in the southeastern part of Somerset County, 

 Pennsylvania. If the line of strike of the Jennings, however, is followed 

 northeasterly across Somerset County, as shown on the various geologic 

 maps of this portion of Penns3dvania, it will lead to the exposure of the 

 Chemung conglomerate described by Professor Stevenson in Juniata 

 Township in the western part of Bedford County. Professor Stevenson 

 called this "the great conglomerate of the Chemung"^ and evidently 

 considered it as representing the one which he named the Upper Chemung 

 conglomerate and reported it as entering the county from Somerset 

 County on the western side of the Savage Mountain anticline. This 

 indicates the possible identity of the flat, Jasper pebble conglomerate of 

 Garrett County and Stevenson's Upper Chemung conglomerate of Penn- 

 sylvania and it is to be remembered that Dr. I. C. White in his descrip- 

 tion of what he regarded as the same conglomerate in Huntingdon 

 County called attention to the presence of the " red jasper ( ?) pebbles." ' 



Numerous loose blocks of, apparently, the same conglomerate occur 

 northwest of Mr. Baker's on the western slope of the hill toward Piney 

 Eun. It was also noted on the western side of the anticline on the hill 

 some distance to the northwest of Piney Run, and near the state line the 

 Hampshire formation is reached. 



Exposure on Pea Ridge. — To the south of the National Road and west of 

 Savage River is an elevated region known as Pea Ridge, near the northern 

 part of which is the post-office of Avilton. On the western, southern, and 

 eastern sides of this ridee the streams have cut deep and vei^ narrow 

 valleys. This is especially characteristic of the country to the southwest 

 of the ridge and in the region of the Elbow on the Savage River. From 



' T% p. 119. 

 » T^ p. 93. 



