Review of the New York Geological Reports. 299 



Brine springs occur throughout the whole extent of the forma- 

 tion ; they issue at the outcropping edges of the siliceous portion 

 of the mass, especially at the junction of the second division with 

 the underlying impervious beds. This salt water is not sufficient- 

 ly pure and strong to compete now with the brines of Salina, but 

 formerly a considerable quantity of salt was manufactured from 

 the springs in question. The existence of brine springs along the 

 whole range of the Medina, together with the lithological similar- 

 ity of its deposites to the red shale below the Onondaga salt group, 

 caused it to be confounded for a time with this latter formation. 



ci5' 



^ 



5i 





( 



