432 
LIST OF ENGRAVINGS. 
Page. 
View of the Adirondack from the Newcomb farm,_219 
In this sketch, whicli was furnished by Mr. Henderson, we have an accurate representation of this mass 
of mountains. Mount Marcy is the liigliest point. This view gives also a correct representation of the derv- 
sity of the northern forests ; not diversity, as said in the text. 
View of the Potsdam sandstone near Keeseville,-266 
This is taken from the bottom of the gorge, looking north. Through 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 are 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 limestone which has been raised up vertically through the 
Trenton limestone, Utica slate and Hudson river rocks, bending and crushing the latter as represented in the 
cut. It is about eighty rods south of Essex village, and may be visited in a skiff. 
Sketch of the Coal-hill mine in Rossie,---354 
Sketch showing the deep channellings of the Birdseye limestone at Watertown,_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 
exhibit 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 
