1066 NEW YORK STATE MUSEUM 



In lithic character the Port Ewen beds of Becraft resemble the 

 Coeymans, and, like these beds, they contain more or less chert. 

 The similarity is emphasized by the occurrence of Monotry- 

 pella tabu lata in both. 



The paleontology of this limestone still needs a careful study. 

 The following annotated list represents the species found in a 

 brief examination of this rock during the progress of mapping 

 the contacts. Care was taken to obtain them from character- 

 istic outcrops, so that there could be no confusion with over- 

 lying or underlying strata. 



Fossils of the Port Ewen teds of Becraft mountain 



IMonotrypella tabulata (Hall) . Abundant, par- 

 ticularly in the upper beds. 



2 Cladopora cf. styphelia Clarke. 2 specimens 

 which resemble this species, but have smaller apertures at in- 

 tervals surrounding, or nearly so, the larger ; found in the upper 

 beds. 



3 Orthothetes becraftensis Clarke. A few 

 specimens of this Oriskany species were found showing charac- 

 teristic form and surface markings. 



4 Leptaena rhomboidalis ( Wilckens) . Middle beds. 



5 Stropheodonta sp. 



6 S. (Leptostrophia) magnifica Hall. In the 

 middle Kingston beds are some specimens which may readily 

 be referred to this species. The muscular scar is less sharply 

 marked than in Str. becki, they are larger and more 

 spreading, and there are four stronger diverging ridges on each 

 side of the central one. The punctate structure is well marked, 

 the punctae being disposed in rows between the striae. No 

 concentric wrinkles have been seen in any of these specimens. 

 These specimens appear to be intermediate between S. becki 

 and true S. magnifica. A large typical pedicle valve, hav- 

 ing a maximum width of nearly 75 mm, was obtained from the 

 lower beds just overlying the typical Becraft. A moderate sized 

 specimen was obtained from the upper beds. 



7 Spirifer concinnus Hall. A large pedicle valve, 

 with a width of 40 mm and a hight of 25 mm, was obtained from 



