336 CHARLES K. SWARTZ 



Nuculites ohlongatus Conrad 



Palaeoneilo brevis Conrad ( ?) 



Bellerophon maera Conrad 



BeUerophon n. sp., approaches B. acutilira Hall 



It will be observed that this faunule, both in position and composi- 

 tion, is quite similar to the Spirifer pennatus var. posterus faunule 

 which lies below the conglomerate in the Great Cacapon section. 



Fifteen-Mile Creek. — This section is seen on Fifteen-Mile Creek 

 one mile above Little Orleans. A conglomerate is there exposed 

 bearing abundant Camarotoechia congregata and Spirifer mesacostalis. 

 Three hundred feet below the latter the following species were obtained : 



Spirifer pennatus var. posterus Hall and Clarke, abundant 



Productella speciosa Hall 



Schizophoria striatula (Schloth), common 



Cyrtina hamiltonensis Hall, common 



The relations are here as in the preceeding sections. 



Polish Mountain near Gilpin. — This section is exposed along the 

 National Road on the western flank of Polish Mountain. Black 

 shales bearing characteristic Genesee fossils occur at the base of the 

 Jennings southwest of the bridge. The Naples fauna is found in the 

 lower part of the Jennings east of the bridge. Twelve hundred feet 

 above the base of the Jennings at the second turn of the road east of 

 the bridge, the following species were observed : 



Spirifer mesacostalis Hall 

 Spirifer marcyi Hall var. 

 Tropidoleptus carinatus (Conrad) 

 Camarotoechia sp. 



Fourteen hundred feet above the base of this section Spirifer mesa- 

 costalis Hall was observed and at 2,000 feet Spirifer disjunctus was 

 found. 



Section east of Okonoko. — Twelve miles south of the preceding sec- 

 tion the Jennings is admirably exposed in the vicinity of Okonoko, in 

 the cuts of the Western Maryland Railroad, north of the Potomac 

 River. About 6,000 feet east of the canal lock, the Hampshire- 

 Jennings contact is observed. At 1,350 feet below the top of the 

 Jennings occurs a massive conglomerate, 20 feet thick. At 3,200 feet 

 below the contact, Spirifer mesacostalis was found associated with 



