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NEW YORK STATE MUSEUM 



Stated to be later than L It is to be regretted that Mr Hall did 

 Hot complete his j>aper, for too much attention could not have been 

 given to proofs of these stratigraphical relations, and in the follow- 

 ing pages, it will be shown that the conclusions reached in this paper 

 favor his first arrangement. T. S. Hunt in the short description of 

 the geology of Port Henry, (Canadian Naturalist, 2nd series, v. 10, 

 p. 420,) regards the limestones near the town as a great, metamor- 

 phosed vein of calcite. C. R. Yan Hise, in company with C. D. 

 Walcott and R. Pumpelly, made an excursion in 1890 from "White- 

 hall north along the Delaware and Hudson P. R. to Westport and 

 thence into the mountains near Mt Marcy. They saw much that 

 suggested the deposition of the limestones along an encroaching shore- 

 line of gneiss, and remark also the extensive gabbro area of West- 

 port. In December, 1893, J. F. Kemp read before the Geological 

 Society of America, a paper on the Gabbros on the Western shore of 

 Lake (Jhamplain, (Bulletin V. 213-221) in which the petrography 

 of these rocks is discussed. In December, 1894, the same writer 

 read a subsequent paper on the Crystalline Limestones, Ophical cites 

 and Associated Schists of the Eastern Adirondacks, (Bulletin YI. 

 241-262) which treats both of petrography and stratigraphy. 



All the other papers that have been written on the region, have 

 small reference to these questions, but as bearing on petrographic 

 points, some are important. Recently an account of the geology of 

 Gouverneur township, on the western side, has appeared from the 

 pen of Prof. C. H. Smyth, jr,* and many facts are adduced. The 

 field work was undertaken in close association with the writer's work 

 on the eastern side and with the general plan of keeping our inves- 

 tigations in harmony. Although no anorthosites are known there, 

 basal gneiss was found practically like that near Lake Champlain 

 and with it is associated igneous granite. Next in succession is* 

 crystalline limestone, with some black schists at its base, but serpen- 

 tinous limestone is practically absent. Above all these is Potsdam 

 sandstone. There is further, a great area of serpentine with red] 

 hematite, whose stratigraphic relations remain to be worked out. 



*A Geological Recormoissance in the Vicinity of Gouverneur, N. Y. Trans. N. 

 Y. Acd. Sci. XII. 97, Feb. 23, 1893. A still more important paper by Dr Smyth 

 on the Gabbro contacts in certain townships in St. Lawrence Co. appears in the 

 Bulletin of the Geological Society of America VI. 263. 



