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NEW YORK STATE MUSEUM 



while, this apical or Albany segment of the gulf was gradually 

 purified by heavy land drainage and became a large brackish or 

 fresh-water lagoon in which no true marine organisms could 

 flourish [fig. 189] 



Fig. 189 Paleogeogxaphic map of Portage time. (After Clarke) 



During the early period of the Oneonta deposition in eastern 

 New York, marine sediments enclosing a somewhat modified 

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

 conditions prevailed in the southwestern part of the Schoharie 

 region and westward, forming the Ithaca beds. The fauna of 

 these beds was at first separated by the Sherburne sand barrier 



1 Clarke, J. M. N. Y. State Mus. Mem. (3, p. 204-5. The possibility that the 

 sediments in question are of continental origin, i. e. accumulated above sea 

 level by river wash and occasional ponding, must not be overlooked. In 

 either case, these red rocks would be the lithic equivalent of the Old Red 

 sandstone of Great Britain. 



