334 CHARLES K. SWARTZ 



cock. West of a ravine, one -half mile east of Millstone, occurs a 

 massive conglomeratic sandstone 25 feet thick, bearing the following 

 species : 



Spirijer mesastrialis Hall, common 

 Orthothetes chemungensis (Conrad) 

 Schizodus gregarius Hall ( ?), common 



The two latter species are poorly preserved. 



Two hundred and fifty feet above the preceding occurs a very thick 

 and massive conglomerate, while 370 feet higher Spirijer disjunctus 

 was observed. A short distance above the latter Spirijer mesastrialis 

 is abundant. 



One hundred and eighty feet below the first-named sandstone 

 Camarotoechia congregata and Spirijer mesacostalis occur as at Han- 

 cock in an iron-stained stratum. 



Four hundred and sixty feet beneath the Camarotoechia congregata 

 zone the following species were observed : 



Spirijer pennalus var. posterus Hall and Clarke, abundant 

 Productella speciosa Hall, common 

 Leiorhynchus glohulijorme (Vanuxem) 

 Cyrtina hamiUonensis Hall 



This faunule resembles the Spirijer pennatus var. posterus faunule 

 of the preceding sections, both in position and composition. 



SECTIONS IN ALLEGANY COUNTY 



The sections will be examined in their order from east to west. 

 The Genesee is present at the base of the Jennings in this county. 



Sideling Creek. — The section is exposed on the west bank of 

 Sideling Creek two miles above its confluence with the Potomac. 

 The stratum there exposed is the lowest observed horizon containing 

 Spirijer mesacostalis, Camarotoechia congregata, etc. This horizon 

 is more or less conglomeratic in character at most localities, and is 

 believed to represent the western extension of the conglomeratic sand- 

 stone bearing Camarotoechia congregata and Spirijer mesacostalis in 

 the section in Washington County. It is highly fossiliferous, the fol- 

 lowing species being observed in it: 



Atrypa reticularis (L.) 



Camarotoechia congregata (Conrad) 



Cyrtina hamiltonensis Hall 



