REPORT OF THE STATE PALEONTOLOGIST 1902 1175 



dout is believed to represent the extension of the Decker Ferry 

 formation, in which case the lower cement bed at Rondout may 

 be correlated with the Bossardville limestone. It is clear how- 

 ever that the Bossardville limestone can not be correlated with 

 the lower cement bed at Rondout since below the latter formation 

 we have the Wilbur limestone with a fauna similar to the lower 

 Decker Ferry fauna, which unites it with that formation and 

 therefore the lower cement bed included between the Wilbur 

 limestone and the Cobleskill limestone must be regarded as the 

 stratigraphic equivalent of a portion of the Decker Ferry forma- 

 tion. The presence of Leperditia and other fossils in the Bos- 

 sardville limestone which lies just below the Decker Ferry forma- 

 tion is indicative of the Salina age of this formation. In Ulster 

 county the Bossardville limestone can not be recognized, but 

 holding a similar stratigraphic position there is a series of soft 

 greenish shales and quartzites which are usually referred to the 

 Clinton formation, but which, together with the underlying red 

 shales, as has been already suggested, may more properly be 

 referred to the Salina. 



