Maryland Geological Survey 63 



stage, especially as it occurs in eastern Now York. Then the northern 

 part of the cut in which hotli the thin and coarser shales contain abund- 

 ant specimens of characteristic Hamilton fossils is very similar to typical 

 fossiliferous Hamilton shales of New York. This is an excellent locality 

 for collecting fossils and is one of the best, in the lower Eomney shales, 

 to be found in the county. 



E.rpofttires in Braddock and Jennings Runs. — As already stated, the best 

 outcrops of the Komney shales in the western belt are in the railroad 

 cuts at 21st Bridge ; but in the northern part of the county Braddock and 

 Jennings runs have cut gorges through the Alleghany Front in which the 

 Devonian and Carboniferous formations are, generally, fairly well shown. 

 To the south of Braddock Run is the line of the Georges Creek and Cum- 

 berland Railroad along which are frequent cuts affording exposures of the 

 rocks. The greater part of the cut directly east of the Winchester Pike 

 crossing is through the Oriskany sandstone; but at its western end are 

 black, fissile, argillaceous shales which belong in the Onondaga or Mar- 

 cellus member. These shales are very fissile at the top and black on fresh 

 exposure but weather to a drab color and turn readily into soil. The 

 remainder of the Romney is covered but in the first cut west of Winchester 

 Pike station the rocks are in the Jennings formation with an average dip of 

 80°. The contact of the Eomney and Jennings is concealed. It cannot be 

 far from the Winchester Road. The Romney would appear to have a thick- 

 ness of about GOO feet in this section. In the Jennings Run section nearly 

 all the Romney is covered ; but by the side of the highway a short distance 

 west of Corriganvillc the upper part of the fonnation is shown. 



Although there are no outcrops of the lower shale at this locality, about 

 9 miles farther northeast in the continuation of this belt Professor Steven- 

 son reported it as " well exposed in a bluff " perhaps a mile south of Hynd- 

 man, Bedford County, Pa.,' and also on the County Road north of this 

 town where he stated that "Both the black and the yellow shales of the 

 Marcellus are shown." "" As already stated the upper part of the fonnation 

 is clearly shown in the ledges by the side of the highway one-half mile west 



' T% p. 99. 

 -IMd., p. 105. 



