Walcott — Occurrence of Olenellus in New Jersey. 311 



Jersey and southeastern ISTew York is peculiar to itself ; and 

 the use of the term " Oneida conglomerate " for the con- 

 glomerate of Kanouse and Copperas Mountains is confusing 

 to one acquainted with the stratigraphy, and much more so to 

 the student who endeavors to class two such unlike formations 

 as one and the same formation. If it is desirable to correlate 

 the conglomerate of Kanouse, Copperas and Green Fond 

 Mountains with the Oneida conglomerate of the New York 

 series, I think less confusion would be caused by calling it the 

 Green Pond conglomerate, and stating that this conglomerate 

 is correlated with the Oneida conglomerate under the belief 

 that it occupies the same stratigraphical position. When I 

 speak of the Green Pond conglomerate, it is understood that 

 the conglomerates of Skunnemunk and Bear Fort Mountains 

 are not included. There appear to be several horizons of 

 conglomerates in the Green Pond Mountain region, viz : 



1st. The Macopin Lake, of lower Cambrian age; 



2d. The Green Pond, Kanouse and Copperas Mountain conglom- 

 erate, Ordovician or Silurian ; 



3d. The white conglomerate west of Greenwood Lake, etc, 



4th. The narrow belt of conglomerate beneath the shales carry- 

 ing the Hamilton fauna, on Greenwood lake, lower Devonian. 



5th. The massive Devonian conglomerate of Skannemunk Moun- 

 tain, which appears to extend to the southwest into Belle- 

 Vale and Bear Fort Mountains. 



Of these the 2d and 5th are massive and important forma- 

 tions. The 1st, 3d and 4th are local and appear to be of little 

 stratigraphical importance. With the exception of the 3d, 

 they serve to emphasize the fact shown by the 2d and 5th, — 

 that conglomerates of essentially the same type may be re- 

 peated at several horizons within the same basin of sedimenta- 

 tion. 



Mr. IN". H. Darton informs me that he arrived at essentially 

 the same conclusions from a much more thorough study of the 

 Green Pond Mountain region than I was able to make. He 

 presented his paper at the Boston meeting of the Geological 

 Society of America (Dec, 1893) and 1 cheerfully yield him 

 priority, as his work was done before I entered the field. 

 These conclusions were not known to me until more than 

 three months after the writing of the preceding notes and 

 after they were in type. 



