568 NEW YORK STATE MUSEUM 



The beds lie conformably inyerted, on account of their being 

 the remnant of the underturned wing of an overturned fold of 

 Appalachian type. This fold has turned into an overthrust 

 fault, which brought the Cambric beds as the next succeeding 

 terrane above th« Normans kill shales. 



On account of the fact that the mass of beds hitherto called 

 Hudson river shales and correlated with the Lorraine beds of 

 central New York, is composed of terranes ranging from the Lor- 

 raine to the lower Trenton, and on account of the lack of a fully 

 representative fauna and of a complete section of the Lorraine 

 portion of these terranes, it is proposed to drop the term,^^Hudson 

 river shales", for the uppermost part of the Lower Siluric, and 

 the term, "Hudson river group", for the Utica and Lorraine beds, 

 and to employ the term Normans kill shales for the clastic facies 

 of a part of the lower Trenton which is characterized by the 

 graptolite fauna at the Normans kill. 



