432 LIST OF ENGRAVINGS. 



Page. 



View of the Adirondack from the Newcomb farm, 219 



In this sketch, which was furnished by Mr. Henderson, we have an accurate representation of this mass 

 of mountains. Mount Marcy is the highest point. Tliis view gives also a correct representation of the deii^ 

 sUy of the northern forests ; not divcrsUy, as said in the text. 



View of the Potsdam sandstone near Keeseville, 266 



This is taken from the bottom of the gorge, looking north. Tlirough this gorge, which is one hundred 

 feet deep, and about one and a half miles long, the Ausable flows. Upon the left is the western wall of the 

 gorge. In front, the strata arc fissured deeply longitudinally. Between the walls a flight of steps descends 

 to the water's edge. The water rushes through with great violence. 



View of a fracture and uplift of the Chazy limestone at Essex, 272 



The mass of rock upon the right is the Chazy Unicstone which has been raised up vertically through the 

 Trenton limestone, Utica slate and Hudson river rocks, bending and crusliing the latter as represented in tlie 

 cut. It is about eighty rods south of Essex village, and may be visited iji a skiff. 



Sketch of the Coal-hill mine in Rossie, 354 



Sketch showing the deep channellings of the Birdseye limestone at Watertowii, 369 



Perforation of granite near Oxbow, 410 



GEOLOGICAL MAP. 



This map represents accurately the general boundaries of the rocks, but it has been impossible to 

 cxliibit all the facts which are of considerable interest. The confined dimensions of the map prevented 

 any attempt to give much more than the geographical extent of the rocks ; and besides it appeared inex- 

 pedient to exhibit the topography of many of the masses, such as beds of iron ore, dykes, etc., on account 

 of the inaccuracy of all the existing maps of the State, more particularly those of the northern district. 

 The coloring conforms mostly to the system now adopted for all maps of this kind : where differences 

 exist, the explanations are given on the map itself. 



