370 The Upper Devonian Deposits of Maryland 



apparently once capped Polish Mountain as was stated in the description 

 of the National Eoad section of this mountain and the same or a similar 

 one. Green Eidge, on the east. This conglomerate does not represent the 

 top of the Jennings formation as is shown by the sections in the western 

 part of Allegany County as well as those of Garrett County. On Polish 

 Mountain are also blocks of loose sandstone containing large numbers of 

 specimens of Ambocoelia. Near the summit and on top of the mountain 

 are numerous blocks of this Ambocoelia sandstone some of which are G 

 inches in thickness. 



Exposure East of Cumberland. — By the side of the National Eoad 

 21/2 miles northeast of Cumberland, to the west of Evitts Creek and 

 Wolfe Mill, are excellent outcrops of the Genesee shale at the base of 

 the Jennings formation. The shale which is very fine, fissile, black in 

 color on a fresh outcrop but weathering to a gray and readily turning 

 into soil, begins some distance above the valley and is exposed along the 

 roadside to the top of the small hill. This is one of the best localities 

 noted in the county for studying the Genesee shale which seems to be 

 the only coiinty in Maryland in which the shale occurs. Fossils are 

 common, perhaps the most abundant species is Bucldola livoniae Clarke. 

 Next in order of abundance are Pterocliaenia fragilis (Hall), Buchiola 

 retrostriata v. Buch, Siyliolina fissurella (Hall), and Probeloceras lutlieri 

 Clarke (?). This locality is readily accessible from Cumberland and is 

 an excellent place for studying the black, fissile shales at the base of the 

 Jennings formation Mhicli the writer has correlated with the Genesee 

 shales of New York. 



The complete list of species found at tliis locality, as determined by 

 Dr. J. M. Clarke, is as follows : Buchiola livoniae Clarke, Buchiola 

 retrostriata v. Buch, Lunulicardium crinitum Clarke, Paracardium doris 

 Hall, Paracardium delicatulum Clarke, Pterocliaenia fragilis (Hall), 

 StyUolina fissurella (Hall), Bactrites aciculus (Hall), Probeloceras 

 lutheri Clarke ( ?). 



On the Williams Eoad, but a short distance southeast of Cumberland, 

 are fossiliferous shales of the upper part of the Hamilton stage of the 

 Eomney formation containing specimens of Tropidolepius carinatus 



