148 NEW YORK STATE MT'SEUM 



form the main portion of the mass are of a darker and somewhat 

 harder limestone than that of bed III. Spirifer (Marti 

 nia) subumbona, Ambocoelia nana and Stro- 

 p h a 1 o s i a t r u n c a t a of large size are common fossils. 

 Ceratopora jacksoni is also common, the long corallites 

 standing out in relief on the weathered surface. 

 The list of species found is as follows: 



Ceratopora jacksoni Grahau cc 



Spirorbis sp. r 



Hederella cirrhosa Hall rr 



Craniella hamiltoniae (Hall) rr 



Chonetes mucronatus Hall cc 



Strophalosia truncata (Hall) cc 



Productella dumosa Hall rr 



Camarotoechia prolifica (?) (Hall) c 



Liorhynchus limitare (Vannxem) c 



Spirifer (Martinia) subumbona Hall cc 



Ambocoelia nana G-rahau cc 



Cvpricardinia indenta (Conrad) r 



Pleurotomaria sp. rr 



Phacops rana (Green) . r 



V 18 inches. The proportion, of shale at this level is con- 

 siderably increased. The whole bed is soft and decomposes 

 readily under the action of the weather. 



This layer occurs again in the bed of Cayuga creek, where it 

 forms the upper of the limestone layers mentioned above. 

 There the lowest of the limestone layers corresponds with bed I, 

 while this, as indicated by the abundance of Chonetes 

 scitnlus in both beds, may be correlated with bed V. At 

 least two intervening beds could be recognized. The litholotcic 

 character of the 11 inch bed and the few fossils obtained are 

 in correspondence with bed II at Plumbottom creek and there 

 is a similar correspondence between the 7 inch bed and bed IV, 

 but the small amount of material obtained does not justify a 

 definite correlation. The intervening limestone could not be 



