LORRAIN SHALES. 



119 



From a Sketch by E. Emmons, Junior ; sliowing the structure and appearance of the Lorrain Shales, at Lorrain, Jtfftrson county. 



7. Lorrain Shales. 



Lithological characters. — Condition as it regards fossils. — Gorges at Lorrain and 



Rodman, etc. 



In the Annual Reports, this mass lias been designated, Pulaski Shales, a name whicii it 

 would have been well to have retained, if it had embraced the whole series ; but at Pulaski 

 only the upper part is visible ; while at Lorrain, the entire mass is exposed and cut through 

 by the Sandy creek, from the grey sandstone to the Trenton limestone, Lorrain is, therefore, 

 a locality far more important than Pulaski ; and hence, according to' the modern practice of 

 giving names to recks, the former is to be preferred to the latter. 



The Lorrain shales, as they exist in Jefferson county, may be described as consisting of 

 thin beds of grey sandstone, alternating with fine argillaceous slates of a greenish color. 



