Maryland Geological Survey 69 



rogersi Hall, Mytilarca (Plethomytiltis) oviformis (Conrad), Actinop- 

 teria deciissata Hall, Modiella pj/gmaea (Conrad)^ Aviculopecten sp., 

 Modiomorplia concentrica (Conrad), Modiomorpha subalata (Conrad), 

 Modiomorpha mytiloides (?) (Conrad), Cypricardella belUsiriata (Con- 

 rad), Cypricardinia indenta (Conrad), Paracydas hrata (?) Conrad 

 (small imperfect specimen), Paracydas tenuis Hall, Pleuroiomaria sp., 

 Pleurotomaria capiUaria Conrad, Bdleroplton hrcvilineatus ( ?) Conrad, 

 BeUerophon {Bucanopsis) leda Hall, Loxonema liamiltoniae Hall, Pla- 

 tyceras sp., Platyceras cf . symmetricum Hall, Diaphorostoma lineatum ( ?) 

 Conrad, Styliolina fissurella (Hall), Coleolus tenuicindus ^s\\, Ortho- 

 ceras subulatum ( ?) Hall, Orthoceras constridum ( ?) Vanuxem, Ortho- 

 ccras cf. exile Hall, Phacops rana (Green). Dalmanites (CrypJiaeus) 

 hoothi (Green). 



Exposure on Williams Road. — The best continuous exposure of the Kom- 

 ney formation in the vicinity of Cumberland is on the Williams Road about 

 3I/2 miles southeast of the central part of the city. The exposures are by 

 the side of the road and are badly weathered, while the road itself winds 

 to a considerable extent making the estimate of thickness somewhat 

 unreliable, still it is probably upon the whole the best section in the 

 vicinity of the city for the purpose of obtaining a general idea of the 

 nature of the formation. Its base is on the western slope of Nicholas 

 Mountain not far east of Mt. Hermon Church and a road \7hich turns to 

 the north. The section was divided into a number of zones which were ex- 

 amined quite diligently for fossils and the lithological characters were also 

 noted M'ith care. The thickness of the zones was estimated but as the 

 road is not at right angles to the strike, frequent determinations of the 

 dip were difficult to make and the estimates are to be regarded as only 

 an approximation. 



The Oriskany sandstone is fairly well shown on the western 

 side of this mountain, a section of which was given by Dr. 

 O'Harra in his report on Allegany County. The top, consisting 

 of about 16 feet of much decomposed yellowish sandstone contain- 

 ing many fossils is clearly shown and this is capped by 2 inches 

 of coarse, blackish, non-fossiliferous sandstone. By the side of 

 the highway the contact between the Oriskany sandstone and the 

 dark Onondaga shales at the base of the Romney is well shown. 



Total 

 Thick- thick- 

 ness, ness. 



