362 The Upper Devonian Deposits of Maryland 



Dr. J. M. Clarke has identified the following species from the col- 

 lections made on Green Eidge: Ambocoelia umbonata (Conrad), Catna- 

 rotoechia coniracta Hall, Liorliynclius cf. midticosta Hall, Spirifer marciji 

 var. superstes Clarke, Spirifer rnesastrialis Hall, Tropidoleptus carinatus 

 (Conrad), Lyriopecten tricostatus (Vanuxem), CypricardeUa gregaria 

 Hall, PalaeoneiJo conslricta (Conrad), Sphenotus contractus Hall, Ten- 

 taculites discisstis Clarke. 



Exposure on National Road on Polish Mountain. — Under the Eomney 

 formation a section was described beginning at the top of the Oriskany 

 sandstone to the west of Gilpin and extending, probably, to the top of the 

 formation. A ledge of coarse shale to thin sandstone occurs in the eastern 

 part of the hamlet which was considered, to be near the top of the Eomney, 

 while from that horizon the rocks are covered east to Town Creek on the 

 bank of which the Woodmont member of the Jennings formation is shown. 



No. 1. On the bank of Flintstone Creek, however, just south of 

 Gilpin are bluish shales containing an abundant Hamilton fauna. Then 

 the rocks are covered, for an interval when black, fissile shales (No. 3) of 

 the Genesee are exposed. These shales are about opposite the old tannery 

 only a few rods above the junction of Flintstone and Town creeks ; and 

 the lowest of them, which are rather bluish in color, are more arenaceous 

 than those seen at the other localities but they contain about the same 

 fauna. At the top of the exposure the shales are more argillaceous and 

 quite carbonaceous and also contain more fossils both in number of speci- 

 mens and species. The dip at this locality is about 30° S. of E. and some 

 75 feet of shales are exposed. 



From the black shales of this locality Dr. J. M. Clarke has identifed 

 the following species: Buchiola retrostriata v. Buch, Lunulicardium 

 crinitum Clarke, Paracardium doris Hall, Pterocliaenia fragilis (Hall). 

 Styliolina fissurclla (Hall). 



No. 3. On the eastern bank of Town Creek at the National Eoad 

 bridge are olive to greenish fine argillaceous shales which alternate with 

 thin bedded sandstones from 3 inches to a foot in thickness. Fossils are 

 rare but Pterocliaenia fragilis (Hall) and Buchiola livoniae Clarke were 

 found. About 100 feet of rock is exposed in this outcrop with a dip of 30° 



