348 NEW YORK STATE MUSEUM 



ever, be definitely correlated with the Cobleskill limestone, as 

 typically developed in Schoharie county. The lower part of the 

 formation is the equivalent of what has been termed Salina 

 waterlime and Wilbur limestone in a previous report.^ 



FOSSILIFEROTJS SECTIONS 



The following fossiliferous sections extending from the well 

 known locality of the Decker Ferry formation, as exposed 3 

 miles south of Port Jervis, and extending northeastward into 

 Ulster county will serve to show the stratigraphic relations of 

 the fossiliferous beds up to the Coeymans limestone. 



Nearpass section 3 miles south from Port Jervis N. Y. 



1 Poxino Island shale. In an excavation a little distance above 

 the base of the cliff there is an exposure of a bed of buff shale I 

 foot in thickness. This exposure is being rapidly covered by 

 talus. No fossils. 



2 Bossardville limestone. Thin banded limestone of alternate 

 light and dark colored laminae. On account of the shaly nature 

 of the rock, the entire thickness of slightly more than 12 feet can 

 be readily examined ; Leperditia altoides Weller found 

 abundantly in layers near top ; Oncoceras cf. ovoides Hall 

 the only other fossil observed. 



3 Decker Ferry. The lower 24 feet of this formation consists 

 of several layers of hard crystalline limestone with some shaly 

 beds. This portion of the section is highly fossiliferous and 

 from the specially characteristic fossil Chonetes jersey- 

 en s i s Weller, it has been designated the Chonetes jerseyensis 

 zone. Though found in the other zones of the Decker Ferry 

 formation and rarely in the Cobleskill limestone of Schoharie 

 county, Atrypa reticularis Linn, is very abundant in 

 the lower portion of the Decker Ferry, and farther north in 

 Ulster county it is so plentiful as to make a distinct band in the 

 Wilbur limestone. 



4 Decker Ferry. Red crystalline limestone 2 feet. This layer 

 is characterized by the species described by Weller as Ptilo- 



^N. Y. State Paleontol. An. Rep't 1903, p. 1142. 



