REPORT OF THE STATE PALEONTOLOGIST 1902 lOGi"; 



seems probable that the Port Ewen section, which is not more 

 than a mile and a half south of the former, contains not much 

 more of these beds. Darton estimates the thickness as 125 feet 

 in the central and southern portion of Ulster county, and states 

 that it decreases northward to 30 or 35 feet in the Saugerties 

 region, near the Greene county line. 1 The Upper Shaly beds of 

 the Port Ewen section have a thickness of from 100 to 200 feet, 

 but except along the roadside, they are poorly exposed on Kings- 

 ton hill. They, together with the Becraft and the repeated Lower 

 Shaly, were mapped by Davis and Darton as Upper Shaly, while 

 the characteristic fossils cited by these observers were obtained 

 beyond doubt from the repeated Lower Shaly beds, for Spirifer 

 macro pleura and Orthothetes radiatus cited by 

 Davis and Darton as characteristic of the Upper Shaly do not 

 appear in Clarke's list of these beds as exposed in the Port Ewen 

 section. 



At Becraft mountain these beds are well shown. They are 

 dark crystalline limestones recalling the Ooeymans limestone. 

 They crop out in a series of steps with a total thickness of not 

 over 25 feet. They are particularly characterized by the 

 Monticuliporoid Monotrypella tabu lata, which may 

 be easily recognized by the transversely wrinkled aspect of the 

 corallites. This species is however not restricted to this hori- 

 zon, being also known in the Coeymans limestone. 



The best exposures of the Port Ewen beds are along the quarry 

 road from the old Jones quarries to the transverse mountain 

 road. Here the thickness can be best determined, and the char- 

 acteristic fossils obtained. The bluffs here rise up to 15 or 20 

 feet in hight, and above them there is a continuous slope east- 

 ward, conformable to the dip of the strata, to a low swampy 

 meadow, where fragments of Oriskany limestone indicate that 

 the contact is near. Allowing for a slight addition above, and a 

 similar addition below to the contact with the Becraft, I do not 

 think that the total thickness of the Port Ewen at Becraft moun- 

 tain will exceed 25 feet. 



1 N. Y. State Geol. 13th An. Rep't. 1894. p. 304. 



