REPORT OF THE STATE PALEONTOLOGIST 1902 IYM 



made. The third layer contains less Stromatopora, while in the 

 fourth layer it is absent. The lower layers weather nearly a 

 uniform color. The following species have been identified from 

 this quarry. 



1 Chaetetes (Monotrypella) arbusculus Hall 



2 Stromatopora sp. 



3 Orthothetes interstriatus Hall 



4 Spirifer vanuxemi Hall 



o Stropheodonta varistriata Con. 



6 Whitfieldella laevis var. ? 



7 W. sulcata Van. 



8 Holopea antiqua Van. 



9 Tentaculites sp. 



Cobleskill in Seneca and Ontario counties 

 In going west from Union Springs the same stratigraphic 

 relations continue over the eastern part of Seneca county, but 

 in McQuan's quarry, 1% miles southwest of Seneca Falls, there 

 is a bed of waterlime lying directly below the Oriskany sand- 

 stone. This stratum of waterlime, which is 11 feet thick, con- 

 tains Eurypterus within 2 feet of the Oriskany and represents 

 the Rondout. Below the Rondout there is a bed of dark blue 

 limestone containing much Stromatopora in its upper part but 

 much less near the base. This layer is 8 feet thick and much 

 like the Cobleskill exposed on Frontenac island, to which form- 

 ation it is referred. The Salina beds do not appear at this point, 

 but at Seneca Falls the gypsum beds are overlain by Salina water- 

 lime containing Eurypterus. The Stromatopora bed of the 

 Cobleskill is covered at Seneca Falls, but it is evident from the 

 position of these two sections that it is included between the 

 Eurypterus bed of the Salina and the Rondout. 



Whether the Manlius limestone again appears west of Seneca 

 Falls has not been satisfactorily established, though there are 

 several localities where beds somewhat similar to the Manlius 

 limestone have been observed. Hall 1 mentions but a single local- 

 ity west of Cayuga lake, where fossils characteristic of the Man- 



1 Geol. N. Y. 4th Dist. 1843. p.141-42. 



