Maryland Geological Survey 397 



the highway are numerous pieces of sandstones containing abundant fos- 

 sils as, for example, Spirifer disjunctus Sowerby, Atrypa hystnx Hall, 

 and pelecypods. There are also dark red sandstones which contain 

 numerous specimens of pelecypods similar to Actinopteria, together 

 with a few Brachiopods. These fossiliferous rocks are stratigraphically 

 above the conglomerate which was described on top of the first ridge. 

 Some of the fossiliferous sandstone is a gi-eenish color, very hard before 

 weathering and, apparently, calcareous. This is about at the line of 

 division between the Catskill and Jennings formations as represented 

 on the Geological Map of the Piedmont Folio. 



No. 4. On the third ridge to the south of Trout Eun, just after 

 crossing a small stream but before reaching the highway turning to the 

 west, are buff, coarse, mealy shales at the base of the hill. Higher are red 

 argillaceous shales and still above these, but loose on the road, are blocks 

 of buff to greenish sandstone containing Chemung fossils, as Spirifer 

 disjunctus Sowerby and some other species, most of which are pelecypods. 



From the above-mentioned outcrops in the Trout Eun region Dr. J. M. 

 Clarke has identified the following species: Atrypa hystrix Hall, Atrypa 

 reticularis (Linne), Dowvillina cayuta Hall, Productella hystricula Hall, 

 Productella lachrymosa (Conrad), Spirifer disjunctus Sowerby, Murchi- 

 sonia sp., Murchisonia ecclesia Clarke. 



Exposures on Cherry Creel-. — Farther southwest Cheriy Creek flows 

 northwesterly across the Jeunings and Catskill formations ; but for the 

 greater part of the distance across the Jennings the country is flat with 

 few outcrops. In the upper part of its course, however, on the foot hills 

 of Backbone Mountain are exposures by the side of the highway but tlie 

 other rocks are largely covered by talus. Along the side of the highway 

 to the south of the east fork of Cherry Creek are olive to buff shales and 

 sandstones. Interstratified witli these rocks are some reddish argillaceous 

 shales. In the olive shales and in layers of the sandstones are numerous 

 specimens of Chemung fossils as Atrypa hystrix Hall, Chonetes scitulus 

 Hall, Leptostrophia perplana var. nervosa Hall, SchuclierteUa clie- 

 mungensis (Conrad), Schizophoria striatida, var. marylandica Clarke, 

 Spirifer disjunctus Sowerby. 



