REPORT OF THE STATE PALEONTOLOGIST 1902 



1197 



has been observed. The lowermost beds of black chert at the 

 base of the Oriskany seen in the east bank of Esopus creek just 

 below the iron bridge where the Mt Marion to Glasco turnpike 

 crosses the creek below Glenerie, about 7 miles north of Kings- 

 ton, are considered to represent the chert beds of the upper part 

 of the Port Ewen formation, though the characteristic Port 

 Ewen limestone beds have not yet been recognized in the vicinity 

 of Glenerie. Another point of difference between the New Scot- 

 land and the Port Ewen is relative scarcity of fossils of the 

 latter formation. 



Both Davis and Darton emphasize the prominence of the slaty 

 cleavage of the " Upper Shaly " beds. Our observations in 

 various parts of the region have demonstrated that cleavage is 

 far more prominently developed in the New Scotland than in 

 the Port Ewen beds. This would be expected as the New 

 Scotland limestones and shales are much the softer and less 

 resistant beds. 



The fauna of the Port Ewen beds is strictly Helderbergian in 

 its expression, no true Oriskany species have yet been found in 

 it, though many of its members are also found in the Oriskany 

 fauna. The list published by Clarke [1900, p. 73 j contains the 

 names of species found in the various layers of the formation 

 exposed in the Port Ewen railroad cut. New material obtained 

 from the lower part of the formation along the edge of the hang- 

 ing wall of the White lime quarry affords the following list of 

 species. 



FAUNA OF THE LOWERMOST PORT EWEN BEDS 

 In edge of hanging wall of White lime quarry 



This horizon is the same as that of bed 4 of the railroad cut 

 section published by Clarke [1900, p. 73]. 



Leptaena rhomboidalis (Wilck), c 

 Atrypa reticularis Linne, a. Some 



very old individuals with thickened 



anterior margins of shell 

 Strophonella leaven worthana Hall, e 

 Dalmanella perelegans Hall, c 

 Orthothetes woolworthanus (Hall), c 

 Spirifer perlamellosus Hall, c 

 Rhipidomella oblata Hall, c 

 Meristella laevis (Vanuxem), c 



Uncinulus campbellanus (Hall), c 

 Nucleospira elegans Hall, r 

 Phacops logani Hall, c 

 Chaetetes sp.t, c 

 Hlndia fibrosa (Roemer), c 

 Tentaculites elongatus Hall, c 

 Anastrophia cf. verneuilli (Hall) 

 Spirifer concinnus Hall, c 

 Acidaspis tuberculatus Hall, c 



