MARCELLUS LIMESTONES OF LANCASTER 151 



VII 14 Indies. Near tlie foot of the dam, and just at ithe bend 

 of the stream, a 14 inch layer of compact semicrjstalline lime- 

 stone is exposed, and above the dam in the quarry the same bed 

 may again be seen. This limestone contains considerable pyrite 

 in minute grains, and also small segregations of flint. It is fine 

 grained, and breaks with a conchoidal fracture. The rock is 

 quarried, the quarrying having proceeded in the fall of 1899 to a 

 depth of 9 inches in the underlying bed, VI. This is the most 

 interesting bed of the section, being rich in large and well pre- 

 served fossils of many species. Meristella barrisi is the 

 most abundant fossil, and large Orthocerata are fairly common. 

 The following species were identified. 



Stereolasma rectum {Hall) rr 



Crinoid stems r 



Spirorbis sp. c 



Hederella canadensis (Nicholson) rr 



H. cirrhosa (Hall) r 



Reptaria stolonifera Rolle r 



Crania crenistriata Hall rr 



C. recta sp. nov. r 



Craniella hamiltoniae (Hall) c 



Stropheodonta (Leptostrophia) perplana (Conrad) pr 



S. inequistriata (Conrad) cc 



Orthothetes chemungensis arctostriata Hall rr 



Ohonetes mucronatus Hall cc 



G. lepidus Hall ' rr 



Productella spinulicosta Hall cc 



Rhipidomella vanuxemi Hall r 



Camarotoechia horsfordi Hall rr 



C. sappho Hall cc 



C. pauciplicata sp. nov. rr 



Cryptonella rectirostris Hall r 



C. planirostris Hall rr 



Spirifer (Martinia) subumbona Hall v 



S". (Reticularia) fimbriatus (Conrad) c 



