PART 2. 



GEOLOGIC FORMATIONS OF NEW YORK 



New York is the mother state in geologic nomenclature, and 

 the names chosen by its early corps of geologists have been 

 adopted in a large degree throughout the whole of the United 

 States. It has moreover, exposed within its borders, a more com- 

 plete and extensive series of the formations below the Carboni- 

 ferous and above the base of the Cambrian than any other state in 

 the Union. It is therefore evident that a complete and repre- 

 sentative collection of the New York rocks is of no small import- 

 ance and the description of its formations is a matter of much 

 interest. 



System 

 Carboniferous 



Devonian 



Synopsis 



Group 



' Chemung-Catskill 

 Portage 



< 



Hamilton 



Corniferous 



^ Oriskany 



Stage 

 Olean Conglomerate of Alle- 

 gany and Cattaraugus 

 counties. This is the 

 Pottsville Conglomerate of 

 Pennsylvania. 



'Portage sandstone 

 Naples beds 



i Gardeau shale and sandstone 



^Caskaqua shale 



'Genesee slate 

 Tully limestone 



( Encrinal lime- 

 Hamilton ■] stone 



( Ludlowville shale 



.Marcellus shale 



f Corniferous limestone 



! Onondaga limestone 



j Schoharie grit 



L Cauda galli grit 

 Sandstone 



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