1204 NEW YORK STATE MUSEUM 



Diaphorostoma desmatum Clarke, c 

 D. ventricosum Conrad, (N), a 

 Strophostylus expansus Conrad, (O) 

 Orthonychia tortuosa Hall, (0) 

 Platyceras gebhardi Hall, (C), c 

 P. nodosum Conrad, (O), a 

 P. reflexum Hall, (C), c 

 P. pernodosum sp. nov., r 

 P. platystomum Hall, (N), r 

 P. lamellosum Hall, (N), r 

 Orthoceras sp.?, r 



Ostracoda, several minute species 



unident. 

 ? Cirripede, of Balanoid type yj 



Phacops logani jffaZZ, (iV), r.j 

 Dalmanites pleuroptyx Green, (N), c 

 D. stemmatus Clarke, c 

 Homalonotus major Whitfield, r 

 Machaeracanthus sulcatus Newberry, 

 g.(D), rjfe-jr/ ' * ' 

 Spirophy ton cauda galli Tarawa* m (D), c 



Esopus grit 



This thick formation covers large areas of country to the west 

 of the Vlightberg and the North hill at Rondout, and it forms the 

 crests of most of the hills along the roads leading from Kingston 

 southwest to Rosendale. Its thickness is 300 to 325 feet. It is a 

 heavy bedded, soft, argillaceous grit of dark olive-brown color 

 and of remarkably even grain throughout its mass, and it is 

 quite barren of organic remains. It has well developed slaty 

 cleavage, which often obscures the deposition planes of the rock, 

 and on its weathered surfaces it breaks down into rounded hil- 

 locks covered with small angular fragments of the stone. Its 

 lower beds are quite heavy, somewhat harder in texture, and 

 their bedding planes are covered with the fucoid Spirophy- 

 ton caudagalli Vanuxem. 



The formation can be well seen in the high bluffs overlooking 

 the left bank of the Rondout creek just north of the Wilbur 

 bridge, and also in the cuts of the West Shore Railroad between 

 the Wilbur tunnel and the Wiltwyck cemetery. It is also finely 

 exposed in the left bank of the Esopus creek at Glenerie its 

 type locality. 



Its upper layers become more limy and finally, through grad- 

 ual changes they merge into the argillaceous limestones of the 

 lower portion of the Onondaga beds. This transition can be well 

 seen in the West Shore Railroad cuts south of Kingston station, 

 and in the banks of Esopus creek beneath the West Shore bridge 

 at the Glenerie falls. 



The only fossils found in this formation are Leptocoelia 

 acutiplicata, Atrypa spinosa, an obscure Disci 

 noid brachiopod and Spirophyton caudagalli. 



