1\*U 



M:W YORK STA'JI-: .MLSKLM 



whil(\ tliis ajMcal or All)any sc^^meiit of the* gulf was gradually 

 puril'uMl by heavy land drainage^ and lu'canio a large brackish or 

 fresh-water higoon in which no true marine organisms could 

 nourish [tig. \><\)]: 



Fig. 189 Prtleogeographic map ol" J'ortage time. (Alter Clarke) 



During the early period of the Oneonta deposition in eastern 

 New York, marine sediments enclosing a somewhat moditied 

 Hamilton fauna, were laid down in central New York. These 

 conditions ])revailed in the southwestern part of the Schoharie 

 i-egion and westward, forming the Ithaca beds. The fauna of 

 these beds was at tirst separated by the Sherburne sand barrier 



'Cljiiive, J. M. N. Y. State Mus. Mom. G, p. 204-5. The possil)ility that the 

 WMliiii'ciits in (lucslioii arc of coiit iiuMilal orif^iu. i. c. accuimilated ahove sea 

 level by rivt-r wash and occasional i)ondin^ must not be overlooked. In 

 either case, these red rocks would be the litliic eiiuivahMit of the Old Ked 

 sandstone of (ireal lliitain. 



