644 E. O. ULRICH REVISION OF THE PALEOZOIC SYSTEMS 



cated by the fossils collected at Newton, Blairstown, and Carpentersville 

 and described in the State report by Weller. Locally, thinner-bedded 

 limestones are found at the top of the Kittatinny, but the contact of 

 these with the underlying dolomites has not been observed in New Jer- 

 sey. However, as these upper beds contain an unmistakable Canadian 

 fauna, there is probably an unconformity here between the two the same 

 as in Pennsylvania and New York, where a well defined stratigraphic 

 break separates similar Ozarkian and Canadian deposits. The Canadian 

 beds referred by Kiimmel and Weller to their Kittatinny limestone 

 being, according to report, only locally developed in the Kittatinny Val- 

 ley, and when present doubtless readily enough distinguished, it seems 

 desirable to restrict the use of the term to the Ozarkian part of the sec- 

 tion. In that event the Canadian part should be called Tribes Hill lime- 

 stone, for it is evidently the southward extension of that recently named 

 New York formation. 



The Ozarkian in Pennsjdvania — Kittatinny formation (Allentown 

 limestone). — In a brief account of papers read at the Second Annual 

 Spring Conference of the Geologists of the Northeastern United States, 

 published in "Science" September 24, 1909, I note that Edgar T. Wherry 

 proposes the name Allentown limestone with the following laconic char- 

 acterization : "Upper Cambrian, white to gray, dolomitic, largely oolitic, 

 full of Cryptozoon, 2,000 feet." From my knowledge of the rocks at 

 and in the vicinity of Allentown, Pennsylvania, it is evident that the 

 new term is intended to include the rocks in the Lehigh Valley which I 

 recognize as Ozarkian. As I had formerly intended to apply the same 

 name to these beds I would be glad to adopt Mr. Wherry's term Allen- 

 town now if I had not come to the conclusion in the meantime that a 

 slight and quite justifiable restriction of the New Jersey name Kittatinny 

 limestone rendered the new name unnecessary. Used in this restricted 

 and more definite sense, the term Kittatinny becomes a useful designa- 

 tion for Ozarkian deposits in New Jersey and in northeastern and central 

 Pennsylvania, corresponding essentially in stratigraphic position to the 

 Potsdam sandstone and Little Falls dolomite of the New York section. 

 However, detailed geologic mapping in the areas concerned will make it 

 necessar}^ to subdivide the Kittatinny into two or three easily recognized 

 members. 



On account of folding it is difficult to determine the thickness of the 

 Kittatinny in the Lehigh Valley. Apparently it is over 1,000 feet and 

 it may be as much as 2,000 feet. The formation rests unconformably 

 on presumably lower Cambrian sandstone, shown in Quaker Hill and 



