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NEW YORK STATE MUSEUM 



crumpling. 1 This resulted in a westward migration of the shore 

 and a consequent working over of the Lorraine shore deposits 

 and their gradual westward spread over the soft Lorraine beds, 

 constituting some of the beds referred to the Oneida conglom- 

 erate which farther out merge into the Oswego sandstone. It is 

 highly probable that daring this time, i. e. while the Oswego beds 

 were creeping out westward, the highest Champlainic beds of the 



Fig. 28 A-C A=Diagram of the strata of New York at the beginning of Upper Silurie 

 time; B=at time of maximum retreat of the sea; C=at end of Salina time. 



interior, i. e. the Richmond shales were deposited [fig. 28B]. By 

 the time that Oswego deposition had been completed the eastern 

 shore was well out of water, and the Lorraine and earlier strata 

 of that region were undergoing folding and erosion simultane- 

 ously. When the shore had migrated westward to the limit indi- 

 cated by the extent of the conglomerates, a reversal of conditions 



lr rhe student must be careful here not to confound this crumpling with 

 the later folding of the strata which has produced the Appalachians. The 

 folding here spoken of affected only the Lorraine and earlier beds and 

 occurred before the deposition of the Silurie and later beds. It resulted 

 in the formation of the Green mountain chain, and is hence commonly 

 spoken of as the Green mountain revolution. 



