1164 NEW YORK STATE MUSEUM 



Manlius. It is but sparingly fossiliferous and appears to be 

 transitional into the Helderbergian to which formation it is 

 provisionally referred. This blue limestone layer is followed 

 by the Stromatopora bed 12 feet thick. The upper portion is 

 very much broken by the formation of deep vertical fissures, 

 similar to those seen in the Coeymans limestone. This Stroma- 

 topora layer is referred to by Vanuxem [loc. cit. p. 110] where 

 he says : " One of the layers, usually from four to five feet in 

 thickness, is traversed by oblique cracks in at least three direc- 

 tions, breaking the mass into irregular parts or fragments; this 

 layer is very fine grained." Besides Stromatopora found in this 

 layer, corals of the genus Favosites are quite abundant. 

 Spirifer cyclop terus is also frequently found. 



The Stromatopora bed is followed by 14 feet of massive blue 

 limestone locally known as the "upper blue beds." Fossils 

 other than Leperditia are rare in these beds. Following these 

 " upper blue beds " and directly below the Oriskany sandstone 

 there is a massive gray limestone 6 feet thick in which some 

 species of fossils are very abundant. This gray limestone ap- 

 pears not to be present at all localities and where absent the 

 Oriskany sandstone follows directly the " upper blue beds." 

 The following species were obtained within 8 feet of the Oris- 

 kany sandstone. 



1 Leptaena rhomboidalis Wilckens 



2 Orbiculoidea cf. discus Hall 



3 Spirifer cyclopterus Hall 



4 Stropheodonta becki Hall 



5 Trematospira formosa Hall 



6 Meristella cf. laevis Vanuxem 



7 Conocardium sp. undet. 



8 Pterinea communis Hall 



9 Tentaculites elongatus Hall 

 10 Leperditia sp. undet. 



