REPORT OF THE STATE PALEONTOLOGIST 19U2 



113J 



Clarke and Mr D. D. Luther, and it is with their permission that 

 it is inserted in this paper. 



The collections from the waterlimes of western New York by 

 Mr Luther and notes bearing on the region examined, have been 

 made available for my study and have given valuable suggestions 

 in working out the relations of the Cobleskill. The study of 

 the fauna from Frontenac island I Union Springs | and its com- 

 parison with the fauna of the Cobleskill of Schoharie county 

 have had a very important bearing in showing that the u Coral- 

 line " or Cobleskill of Schoharie county is of post-Salina age. 

 That a probable relationship existed between these two rock 

 masses had already been suggested by Dr Clarke. In speaking 

 of the species associated with the Eurypterus in the Salina beds 

 of Cayuga and Herkimer counties, he says 



The study of these has indicated the probability that we may 

 not be altogether secure in the time-honored interpretation and 

 correlation of some of our other strata having similar lithologic 

 characters, such for example as the Coralline limestone of Scho- 

 harie county and the waterlimes of the eastward sections. The 

 fauna of a specially interesting outcrop of dark dolomite appear- 

 ing on Frontenac island in Cayuga lake, where it is intercalated 

 between the TVaterlime strata, will, when fully studied, give 

 important aid in the interpretation of the proper relations of 

 these beds to those which they immediately precede in time an 1 to 

 which they are otherwise allied, that is to the true Helderbergian 

 strata. 



The probability of a relation existing between the beds of 

 Frontenac island and the Cobleskill of Schoharie county, as thus 

 expressed, may now be considered a certainty. As already indi- 

 cated, the result given by Dr Clarke, relative to the unmistakable 

 Siluric aspect of the section at Union Springs, is confirmed by a 

 reexamination of the fauna, of which the stratigraphic relations, 

 as shown by the accompanying map. can leave no doubt as to the 

 position of these rocks with reference to the true Helderbergian 

 strata. 



1 X. Y. State Paleontologist. An. Rep't. 1902. p. 422. 



