INDEX TO PLATES IN GEOLOGIC ORDER 257 



Lower Silurian. 



PLATE FACING PAGE 



XXV. Calciferous Sandrock Resting on Precambrian Crystalline 

 Schists, West Shore R. R. cutting, one mile west of Dow- 

 ning Station, Montgomery county 146 



XXVI. Calciferous Sandrock, East Canada Creek, Herkimer county, 



one mile above itsmouth 146 



XXVII. Calciferous Sandrock, East Canada Creek, two miles above 



its mouth, Herkimer county 146 



XXXIV. Calciferous Sandrock, Utica Shale and Trenton Limestone, 



Canajoharie, Montgomery county 148 



XXVIII. Calciferons-Trenton Limestone, Plain of; view of In wood, 



Manhattan Island 146 



XXIX. Calciferous-Trenton, Metamorphosed ; Marble Quarry, SiDg 



Sing, Westchester county 146 



XXXIX. Calciferous-Trenton Limestone, Metamorphosed Hudson 

 River Mica Schist Overlying Semi-crystalline: Verplanck's 



Point, Westchester county 150 



CVII. Calciferous-Trenton Limestone, Metamorphosed; Marble 



Quarry, Tuckahoe, Westchester county 198 



CIX. Calciferous-Trenton Limestone, Metamorphosed ; Limestone 



Quarry, Tomkins Cove, Rockland county 206 



XXX. Trenton Limestone, Glens Falls on the Hudson River, 



Saratoga and Warren counties 148 



XXXI. Trenton Limestone, Upper Gorge, Trenton Falls, Oneida 



county 148 



XXXII. Tien ton Limestone, Principal Cascade, Trenton Falls, 



Oneida county 148 



XXXIII. Trenton Limestone, Spencer Fall, Trenton Falls, Oneida 



county 148 



CXIV. Trenton Limestone, Quarry in, Saratoga county, south bank 



of Hudson River opposite Glens Falls 222 



XXXIV. Trenton Limestone, Utica Shale and Calciferous Sandrock, 



Canajoharie, Montgomery county 148 



XXXV. Utica Shale, Gorge in the; South of Canajoharie, Montgom- 

 ery county 150 



XXXVI. Hudson River Group, Fold in Sandstone of the; Catskill 



Creek, Greene county -- 150 



XXXVII. Hudson River Shale in Railroad Cutting; Kenwood, Albany 



county. Dip Vertical 150 



XXXVIII. Hudson River Schist, Avith Pegmatite Veins, Crumpled; 

 opposite 130th street, on west side of St. Nicholas avenue, 



New York city - 150 



XXXIX. Hudson River Mica Schist Overlying Semicrystalline 

 Calciferous-Trenton Limestone, Metamorphosed; Ver- 

 planck's Point, Westchester county 150 



