54 NEW YORK STATE MUSEUM 



tion diagrams on plates V^II and IX, as well as depicted on the 

 separately published 1842 " Geologic Map of the State of New 

 York " by Emmons, Vanuxem, Mather and Hall. Emmons's ideas 

 on the origin of the red iron ore (pages 97-98) have already been 

 mentioned. 



186^. Across the river lies Canada, and the dividing line 

 although a river is not a geologic boundary, as the key map (figure 

 i) clearly shows. In 1863 appeared Sir William E. Logan's " Geol- 

 ogy of Canada^' using Emmons's names for the formations and 

 giving much detail of their distribution just over the line (pages 

 87 to 122). It is easy to recognize, in the careful sections, the 

 various members to which we are now supplying names. The map 

 in the atlas accompanying this book (not printed until 1865) covers 

 New York State also, this portion contributed by our own State 

 Geologist, Dr James Hall. But this map was only a reduced prelim- 

 inary copy of the large "' Geological Map of Canada" issued the fol- 

 lowing year, copies of which are very rare. A few years later 

 T. B. Brooks examined the iron mines of Rossie, near Keene, and 

 published his observations already commented on (American 

 Journal of Science, July 1872, 4:22-26). 



1875. Except for a map of the eastern United States by Hall 

 in the 27th Museum Report (1875), and the notes in Macfarlane's 

 "Geological Railway Guide" (1879), nothing further of conse- 

 quence was printed concerning our area until 1888, when the New 

 York State Museum bulletins began to appear. In bulletins 3, 7 

 and 10 (1888, 1889, 1890) Prof. J. C. Smock of Rutgers College 

 reviewed the economic aspects of our building stones and iron ores, 

 but without specific mention of any workings within our quad- 

 rangle. Charles D. Walcott's papers on the correlation of the 

 Cambrian in bulletin 81 of the U. S. Geological Survey include 

 several mentions of our rocks, especially pages 203-5, 244, 341-42, 

 363, 381, and the maps of plates I and II (1891). Incidental value 

 attaches also to the papers by Prof. C. H. Smyth, jr, then of Ham- 

 ilton College, "A Geological Reconnoissance in the Vicinity of 

 Gouverneur " in the Transactions of the New York Academy of 

 Science, 12: 97-108 (1893), especially pages 102-4; and "General 

 and Economic Geology of Four Townships in St Lawrence and 

 Jefferson Counties " in the 13th Report of the State Geologist 

 (1894), pages 491 to 515, especially pages 500-11; and by Prof. 

 ■N. H. Winchell, geologist of Alinnesota, on " The Potsdam Sand- 

 stone at Potsdam, N. Y." in the 21st Minnesota report, pages 99 

 to 112 (1893), all of which have been cited in the preceding pages. 



