Maryland Geological Survey 373 



Total 

 Thick- thick- 

 ness, ness. 

 Woodmont member of the Jennings formation. Dip at top of Gene- 

 see shales 77°, on the massive sandstone 85°, and in the upper part 

 of the section from 84° to 86° 190+ 333+ 



No. 7. Rocks mostly covered. Thickness estimated as about 

 2740 feet 2740 3073 



No. 8. Exposures in the highway cut about 1% miles west of 

 Corriganville and directly below a small railroad bridge. In the 

 lower part are brownish-red, micaceous sandstones and argillaceous 

 shales and higher are greenish and yellowish shales and sand- 

 stones varying in thickness from an inch to 1 foot 112 3185 



No. 9. Mostly very massive thick bedded grayish quartzose 

 sandstone alternating with layers of conglomerate. Some of the 

 largest pebbles are in the upper layers at the western end of the 

 cut although these layers are mainly a brownish-gray coarse grit 

 containing an occasional pebble; but other layers near the center 

 of the mass contain more numerous quartz pebbles and form a con- 

 glomerate. The pebbles are mainly white quartz, rounded or flat- 

 tened in shape and of various sizes up to an inch or more in diam- 

 eter. Some of the sandstone layers contain Chemung pelecypods 

 and Dr. Rowe found a single specimen of Spirifer disjunctus 

 Sowerby, while specimens of small Tentaculites and crinoid seg- 

 ments occur. Near the western end of the cut on the surface of 

 thin sandstone layers are specimens of Sphenotus contractus Hall. 

 This conglomerate at one time was considered to mark the upper 

 limit of the Jennings formation; but later investigations have 

 shown that it is better to draw the line of division at a horizon 

 several hundred feet higher. It was also considered as occurring 

 near the horizon of the conglomerate which has been noted on top 

 of Green Ridge and Polish Mountain as well as the prominent one 

 in Garrett County which in a general way is probably true, although 

 it is hardly proven that they occur at strictly the same horizon; 

 but they do occur in the upper part of the formation within several 

 hundred feet of its top. The rocks at this locality are quite similar 

 in lithological appearance to many exposures of the upper Chemung 

 in southern and southwestern New York 40 3225 



Dr. O'Harra gave the thickness of this zone in Jennings Run 

 as 35 feet and stated that, " It is well marked by a line of hills 

 along the eastern slope of Allegany Front and near the southern 

 end of this line of hills 41/2 feet of the bed is shown." ' About 

 TV2 miles northeast of Jennings Run, in Gladden's Run west of 

 Palo Alto, Bedford County, Pa., Professor Stevenson found a con- 

 glomerate which from the context ' he evidently regarded as the 



' Allegany Co., p. 107. 



■T^, p. 79, where the list of localities of the lower conglomerate in the 

 county is given. 



