262 



Report of the State Geologist. 



Lardner Vanuxeni, in his report on the Geology of the Third District 

 of New York, 1 842, describes the " shales and calcareous slates,' 1 in which, it 

 now appears the salt beds occur, as the "second deposit" of the Onondaga 

 salt group. He does not state the thickness of the strata included under that 

 designation, nor can any be definitely given now, as it is exceedingly 

 variable. Along the line of outcrop the thickness is not more than fifty 

 feet, perhaps considerably less in some places, while at Tully, including the 

 salt, it is more than 300 feet. 



The layers of rock salt are also very unevenly bedded, as is shown by the 

 Tully salt well records, and are probably largely heterogenous in character, 

 as in the Livonia, Retsof, Lehigh and Greigsville salt mines in western New 

 York. Mr. Graham states that the contact rock over the upper bed of salt in 

 the Tully wells is limestone. 



The following table is copied from the Solvay Process Co.'s record. 

 Nearly all of the wells end at the bottom of the upper layer of salt : 



