EURYPTERUS SHALES OF THE SHAWANGUNK MOUNTAINS 297 



prime inference that concerns us in this place is that the 

 Shawangunk grit so far from being an eastern representative of 

 the Oneida conglomerate of early Upper Siluric age is actually the 

 arenaceous representative of the Salina period in eastern New- 

 York. Hartnagel's investigation of this problem is based wholly 

 on stratigraphic evidence ; the paleontology of the formations 

 involved was not taken into account and indeed there was not 

 at the time any paleontologic evidence to be considered so far as 

 the Shaw r angunk grit is concerned for no fossil had ever been 

 seen in it. 



We here present a noteworthy corroboration from novel and 

 extremely interesting paleontologic evidence of this correlation 

 originally made upon purely stratigraphic data. 



In typical sections of the Salina series of formations in western 

 New York, the peculiar arid conditions of this epoch are accom- 

 panied and indicated by the appearance of a profuse and 

 remarkable crustacean fauna presented by the Pittsford shales 

 and described by the writer in New York State Paleontologist 

 Report, 1900, pages 83 and 92, and C. J. Sar.le in New York 

 State Paleontologist Report, 1902, page 1080. 



Although it has been possible to exploit these shales in only one 

 locality, in and along the Erie canal near Pittsford, Monroe co., 

 the fauna which has been described covers the merostomes Euryp- 

 terus, Pterygotus, the new genus Hughmilleria, Pseudoniscus and 

 the phyllocarids Emmelezoe and Ceratiocaris. 



The black shale with this fauna graduates by alternation into 

 the thin waterlimes above and it is not until the lapse of the 

 entire sedimentation of the Salina, which at its climax involved 

 extreme salt pan conditions, that the merostome fauna comes back 

 in the final stage of the period with the breaking down of barriers 

 and the freshening of the waters. This later phase is the period 

 of the Bertie waterlime with a rich and widely known fauna of 

 Eurypterus, Pterygotus, Dolichopterus, Eusarcus, Pseudoniscus, 

 Ceratiocaris etc. 



During the past season, my assistant Dr Ruedemann, having 

 occasion to visit Otisville, in western Orange county, to examine 

 some graptolite-bearing layers of the " Hudson River " shale to 

 which my attention had been courteously directed by Dr H. B. 

 Kummel, visited a quarry in the Shawangunk grit alongside the 

 Erie Railroad at that place and there observed a black shale layer 



