Maeylaxd Geological Survey 121 



Becraft Member 

 The Becraft of MarylaBcl is characterized by tlie presence of Spirifer 

 concinnus and other species diagnostic of the Becraft of New York as 

 shown by the list of species. The relations of the member are shown in the 

 subjoined table which emphasizes the close resemblance of the fauna to that 

 of the New Scotland, a condition observed also in New York and New 

 Jersey. 



No. 



Species previously described 22 



New species 1 



Total 23 



Previously described species occurring in the New Scotland of New York 



and New Jersey 14 



Previously described species occurring in the Becraft of New York and 



New Jersey 6 



Previously described species occurring in the Oriskany of New York and 



New Jersey 8 



The beds closely resemble the Becraft of New York not only faunally, 

 but also in their lithology and their stratigraphic position. 



Oriskany Formation 

 As has been shown in the preceding chapter, the Oriskany formation is 

 divisible into two members the Shriver Chert below and the Ridgely sand- 

 stone above. 



Shriver Chert Member 

 About Kingston and Eondout, New York, Davis ^ found a series of 

 shaly limestones, said to lie above the Becraft, with a thickness of 250 feet. 

 This he called the Upper Shaly Limestone, because it contained many of 

 the fossils of the underlying shaly limestone (the New Scotland). Later 

 Claike and Schuchert^ named these strata the Kingston beds. The same 

 name had been used in 1873 by the Canadian geologists, Bailey and 

 Matthew, hence Clarke,"* renamed the New York formation Port Ewen, 



' Amer. Jour. Sci., vol. xxvi, 1883, p. 389. 



- Science, Dec. 7, 1899. 



= N. Y. State Mus., Bull. No. 49, 1903, p. 666. 



