Maryland Geological Survey 371 



(Conrad), Spirifer mucronatus (Conrad), Palaeoneilo emarginata (Con- 

 rad), and other Hamilton species. Succeeding the Ronmey formation are 

 finer argillaceous shales which split into very thin layers. In the shales 

 are specimens of calcareous concretions which have been broken and the 

 cracks filled with calcite so that except in regard to size they considerably 

 resemble the septaria of the Genesee shale in New York. The shales 

 contain some fossils as Buclnola retrostriata v. Buch, Bactrites acicvhis 

 (Hall), and a few other species and are in the lowest part of the 

 Jennings formation which is referred to the Genesee shale. As has 

 already been mentioned the stratigraphy of the outcrops on this part 

 of the road is somewhat complicated by faulting and folding. 



From these shales on the Williams Road and McKays Hill southeast 

 of C^^mberland. Dr. J. M. Clarke has determined the following species: 

 Buchiola livoniae Clarke, Buchiola retrostriata v. Buch, Paracardium 

 doris Hall, Pterochaenia fragilis (Hall), Sttjliolina fissurella (Hall), 

 Bactrites aciculus (Hall), Proheloceras lutheri Clarke, Tornoceras uni- 

 angulare (Con r a d ) . 



Farther east on the road and still higher in the Jennings formation 

 the shales are olive in color and fossils are infrequent. This portion of the 

 formation is correlated ^^dth the Portage stage in New York. 



Exposure on Jennings Rim. — Jennings Run, in the northern part of the 

 county, a tributarj' of Wills Creek, has cut a deep trench through the 

 eastern face of the Alleghany Front in which part of the formations of the 

 Upper Devonian and Carboniferous are well shown. The lower part of 

 its course is across the Romney formation all of which is covered except 

 its top which is also true for the greater part of the middle portion of the 

 Jennings formation, while several succeeding formations are quite well 

 shown in the narrow part of the gorge. In the section above Corrigan- 

 ville, the upper part of the Romney is sho^vn as has already been described 

 under that formation, but the remaining part of the section was only 

 briefly mentioned. This is an important locality for studying the forma- 

 tions under consideration and the various exposed zones will now be 

 described in detail. 



