XX PEELIMINAEY EEMAEKS. 



equivalent beds of other parts of the country, I am not prepared at ^Jresent 

 to give a very decided opinion. I see no reason, however, to dispute the notion 

 generally held that the Lower Marl Bed of the State is equivalent to No. 4, or 

 the Fort Pierre group of the Upper Missouri Cretaceous region. In regard 

 to the Raritan Clays which underlie the Lower Marl Bed, I have made some 

 suggestions preceding their description. And in regard to the beds at the top 

 of the Upper Marl Bed, referred to as Eocene, I would state that so far as the 

 Lamellihranchiate shells are concerned, there is so little in common with the 

 Eocene known from other localities, that, taken alone, their evidence is not 

 very strong either for or against this Eocene age. The Gasteropodous fauna, 

 however, is more Eocene in its character than that of the LameUibrancJdaies. 



