244 Neu> York State Museum 



ing the Trenton, late Black River, or the earliest stage of 

 the Trenton itself. The limestones in Orange county 

 have been shown to contain fossils of Potsdam as well 

 as of Trenton age and west of Newburgh a limestone 

 has been found that looks very much like the Hoyt 

 limestone and contains a Cryptozoon-like marking. 

 On the Poughkeepsie quadrangle the limestone rests 

 conformably above the Poughquag quartzite and con- 

 tains a fauna of Lower Cambrian age. A similar 

 limestone occurs on the Newburgh quadrangle, and 

 south of this area a Beekmantown fauna has been 

 found. 



The Wappinger limestone has also been described as 

 the Barnegat limestone (Mather '38) from Barnegat 

 (now Stoneco) in Dutchess county. An extensive area 

 of this limestone developed just north of the Fishkill 

 mountains has been called the Fishkill limestone (Gordon 

 '09) and is in part equivalent to the Wappinger. The 

 limestone has also been described as the Neelytown lime- 

 stone (Horton '39) from Neelytown in Orange county, 

 and the limestone above the conglomerate limestone on 

 the Newburgh quadrangle has been recently (Holzwasser 

 '26) designated the Bahnville limestone after the town 

 of Balmville. A series of rocks exposed at Rochedale, 

 Dutchess county, has received the name of Rochedale 

 group (Dwight '87). The fossils reported indicate that 

 they are the equivalent of the Beekmantown, but these 

 beds have never been mapped separately from the Wap- 

 pinger limestone. 



The fossils. Characteristic fossils of the Cambrian 

 and Ozarkian formations in New York State are illus- 

 trated in figures 27 and 28. They are as follows : 



