l6 NEW YORK STATE MUSEUM 



shells of Strophalosia truncata and Ambocoelia 

 nana. Miss Wood records a total of 72 species. The more 

 common and characteristic of these are: 



Ambocoelia nana Grabau Spirifer (Martinia) subumbonus Hall 



Chonetes mucronatus Hall Cypricardinia indenta {Conrad) 



C. scitulus Hall , Orthoceras exile Hall 

 Liorhynchus limitare {Vanuxem) O. marcellense Vanuxem 



Strophalosia truncata (Hall) Phacops rana (Green) 



Meristella barrisi Hall Primitiopsis punctulifera Hall 



Cardiff shale 



The upper beds usually included in the old term Marcellus, and 

 designated by Vanuxem the "Upper shales of Marcellus" are 

 abundantly exposed about the village of Cardiff, Onondaga co., 

 and recently have been named from that locality.^ 



This division consists of a series of dark calcareous and black 

 slaty shales with thin layers of fossiliferous limestone. Rows of 

 spheric concretions occur in the lower part at some localities. The 

 fossil contents are not essentially different from those below the 

 Stafford limestone, but the shales are more calcareous and weather, 

 specially in the upper beds, to an ashen gray. 



The beds immediately above the Stafford limestone are not 

 exposed on this quadrangle but an exposure beginning near the 

 New York Central Railroad bridge over Buffalo creek, J mile west 

 of the outcrop of Stafford limestone previously mentioned and 

 not more than 15 feet above it, extends along the bed of the stream 

 to Gardenville and the east line of the quadrangle. The lower 

 shales outcrop on Cazenovia creek at the park just above Cazenovia 

 street, and the upper beds at the covered bridge, nearly 2 miles 

 farther up the creek. 



At West Seneca outcrops occur in the line of Smoke's creek 

 between White's Corners and the western New York and Penn- 

 sylvania Railroad and at the north end of the low cliff on the lake 

 shore at Bay View. 



The more important exposures of the Cardiff shales toward the 

 east are along Plumbottom creek at Lancaster; along Oatka river 

 at Leroy; Conesus outlet at Littleville near Avon; Flint creek 

 near Orleans, Ontario co. and in the vicinity of Marcellus and Cardiff 

 in Onondaga county. 



The thickness of the Cardiff shales on this quadrangle is estimated 

 to be 45 feet. In Ontario county it is 100 feet and at Cardiff, 

 Onondaga co. 175 feet. 



IN. Y. State Mus. Bui. 63. 1903. p. 16. 



