MAROELLUS LIMESTONES OF LANCASTER 151 



VII 14 inches. Near the foot of the dam, and just at the bend 

 of the stream, a 14 inch layer of compact semicrystalline 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. 



StereolaBma rectum (Hall) rr 



Or moid stems r 



Spirorbis $p. c 



Hederella canadensis (NichoDson) rr 



H. cirrhoisa (Hall) r 



Reptaria stolonifera Rolls r 



Crania crenistriata Hall rr 



C. recta sp. nov. r 



Craniella hamiltoniae (Hall) c 



Stropheodonta (Leptostrophia) perplana (Conrad) rr 



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) eubumbona Hall r 



S. (Reticularia) fimbriatus (Conrad) c 



