90 



NEW YORK STATE MUSEUM 



The following table shows the succession of formations in this 

 region, of which those above the Hamilton of the Devonic and 

 those below the Lorraine of the Champlainic are not shown in 

 the area covered by the map. 



Carbonic absent from this region. 



Devonic 



GROUP 



f Chantauquan 



Upper -{ c, 

 ^^ '■ benecan 



Erian 

 Middle^ 

 { I Ulsterian 



f Oriskanian 



1^ Lower -{ 



Heldbergian 



Siluric or { jy ^ 



Ontario ^PP^'' ^'•>'"g'" 



STAGE 



Catskill 



Oneonta 



Ithaca 



Sherburne 

 j Hamilton 

 j Marcellus 

 j Onondaga 

 I Schoharie ^ 

 j Esopns 

 I Oriskany 

 " Port Ewen 



Becraft 

 ^1 New Scotland 

 [Coeymans 



Man 1 ins 



Rondout 



Cobleskill 



Bray man 

 I Basal (Binnewater?) 

 I sandstone 



i 



Hiatus and stratigrapliic unconformity 



"Upper Cincinnatian j Lorraine 



I Utica ^ 



Champlainic i Middle Mohawkian _J ^i. ,i o- , 



( Lovvville 



Lower Canadian \ Chazy 



I Beekmantown 



Cambric or j ^t o ^ 



rp . 1 Upper baratoo^an 

 1 aconic ( ^ ^ " 



Potsdam 



Hiatus and structural unconformity 



Crystalline Archean and Algonkian 



At two levels in the table a hiatus occurs which in each case 

 marks an important physical break in the series, and a time 



4 



