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gga ( 
representative of the Genesee slate. Our remarks on a. 
ject will be more appropriately introduced after treating of 
succeeding formation, denominated the 
Hamilton Group. (Part of F. 8 of Penn. and Virg.)—We are 
informed by Hall, that the line of separation between this and 
the upper olive shales of the Marcellus group is no where well 
marked, the change in lithological character being gradual, an 
even some of the fossils are continued from one into the other, 
so that the beds last described might be considered the inferior 
