Index to plates in geologic order. 



Igneous. 



PLATE FACING PAGE 



I. Granite Dyke in Hudson River Schist, South Side of 192d St., 



New York City 124 



II. Igneous Granite on Lower Silurian Limestone, 192d St., New 



York City , 124 



III. Exposure of Serpentine Eock, Hoboken, N. J. Derived from 



the Chemical Alteration of an Igneous Rock 124 



IV. Palisades of the Hudson River. Seen from Hastings, West- 



chester county. Triassic Diabase Overlying Sandstone 



Which is Concealed by the Talus 124 



LXXXVII. Palisades of the Hudson River, from Fort Lee, N. J.; View 



Northward Along the 172 



LXXXVIII. Palisades of the Hudson, The ; View Northward from Engle- 



wood Cliffs, N. J 172 



LXXXIX. Triassic Diabase Exposed in a Cut for the Orange Mountain 



Cable Road, Orange, N. J 172 



XC. Triassic Sandstone, Contact of Trap and Underlying; south 



end of Lane's Quarry, Fort Lee, Bergen county, N. J 172 



Archaean or Precambrian. 



V. Precambrian Gneiss, Mohawk Valley at Littlefalls, Herkimer 



county - - - 138 



VI. Precambrian. Folds in Fordham Gneiss, north side of 138th 



street, east of 7th avenue, New York city 140 



VII. Precambrian. View from Peekskill. Highlands of the Hud- 

 son 140 



VIII. Precambrian. Anthony's Nose and Manitou Mountain. 



Highlands of the Hudson 140 



IX. Precambrian. Crow Nest and Storm King. Highlands of 



the Hudson 140 



X. Precambrian. View of the Highlands of the Hudson and 

 Sugar Loaf Mountain, from Ft. Montgomery, Orange 



county 140 



XL Precambrian Granite. Breakneck Mountain, seen from the 



Shore Opposite Cold Spring, Putnam county 140 



XII. Precambrian and Lower Silurian. Fishkill Mountain, seen 



from Cornwall, Orange county 140 



