;».ss 



Report of the State Geologist. 



Series V. At the High Falls of the West Branch, near the North Elba 

 line, a trap dike of eight or nine feet in width becomes the directing agent of 

 the stream and explains the deep and narrow gorge by its easy decay and 

 erosion. Immediately associated with it is much coarser crystalline red 

 granite, precisely similar to the association of the dike and granite at the falls 

 and gorge near Keene Center, as described in my former report, p. 468. The 

 granite is older than the dike, for inclusions of its red aggregates of quartz 

 and orthoclase are frequent in the trap. 



Series VI. The sands and gravels of the glacial and post-glacial times 

 are strongly developed in the northeastern corner. They lie well up the 

 valley of the West Branch. The most abundant by far are in the nature of 

 water-sorted materials, fine sands and gravel. 



Mines and Quarries. There is an abandoned prospect for iron ore just 

 west of Wilmington, called the Weston mine. It was never a serious producer, 

 but attracted attention in connection with the bloomery that formerly was 

 operated in Wilmington village. The associations would indicate a 

 titaniferous ore. The existence of a pegmatitic development* of anorthosite 

 with some pyrrhotite near the little post office of Hazleton, has been 

 mentioned under No. 20. The samples shown me were only of mineralogic 

 interest, although of course the general geologic relations in wall rocks of 

 the gabbro family, suggests the presence of nickel and cobalt, but experience 

 in the norian rocks of the Adirondacks and Canada to date has only developed 

 titaniferous magnetites as the ores present. 



St. Armand. 



In my previous report a short sketch of the northwestern corner of this 

 town was given and it was shown to be of the typical gneisses of Series I. 

 In September, 1895, I was able to gather some further details, and have 

 redrawn the old map so as to include them. Nevertheless, the lack of time 

 and means, the rainy weather and the pressure I felt upon me to make a 

 reconnaissance of the southern tier of towns of the county, prevented the trips 

 into the wilderness along the southern boundary of the town that I expected 

 to carry out. Since the field work of 1893, the lake Placid sheet of the United 

 States Geological Survey has appeared and has rendered available a. map of 

 the eastern half. 



Topography. St. Armand lies along the Saranac river, which cuts it on 

 the diagonal. The northeastern coi ner is covered with sand and gravel and 



