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NEW YORK STATE MUSEUM 



Micropegmatite, 181. 



Microperthite, 32, 35, 36, 38, 40, 41, 

 49, l8l, 183, 184. 



Miller, W. J., cited, 25, 77, 99. 



Millsite lake, 35, III, 127, 132. 



Mixed rocks, 47. 



Mohawk valley, Paleozoic oscilla- 

 tions of level, 97. 



Mohawkian series, 79-92. 



Moraines, 151-53. 



Morley, E. W., analyses by, 176. 



Morris granite, 176. 



Mud lake valley, 127. 



Muscovite, 36, 177, 184. 



Natural bridge, 89. 



Old planation surfaces, 170-71. 

 Oligoclase, 32, 36, 38, 40, 41, 181, 183, 

 .184. 

 Ontario valley, 126. . 

 Orleans Four Corners, 115. 

 Orthis pervetus, 90. 



tricenaria, 90. 

 Orthoceras multicameratum, 81, 82. 



recticameratum, 81, 82. 

 Orthoclase, 32, 34, 50. 

 Orton, cited, 98. 

 Oswego sandstone, 19, 123. 

 Outliers, 114. 



Pachydictya acuta, 91. 



Paleozoic altitude and climate, 122- 



23. 

 Paleozoic folding, 1 12-15. 

 Paleozoic oscillations of level, sum- 

 mary of, 92-97. 

 Paleozoic rocks, 14-22, 54-9 2 ; dip of, 



98-99; faults, 120; joints, 107-8. 

 Pamelia limestones, 6, 17-18, 22, 54, 



68-79, 95, 97, 130, 132; age of, 78; 



extent, 77-78; faults, 120; fold, 



115; quarries, 173, 175- 

 Pegmatite, 36, 48, 49, 50. 

 Perch lake, 64, 71, 132, 150. 

 Perch river, 89, 134. 

 Petrography of some Precambric 



rocks, 175-87. 

 Philomel creek, 133. 

 Phlogopite, 29, 32, 35, 53- 

 Physiography, 141-50. 



Phytopsis, 75, 80. 



tubulosum, 83. 

 Picton granite, 11-13, 39, 40, 41, 48, 



50, 51, 103, 119; analyses, 176, 181- 



82; quarries, 174. 

 Pitted clays, 158. 

 Plagioclase, 34, 40, 49, 183. 

 Plateaus, 129-31. 

 Plectambonites sericeus, 91, 92. 

 Pleistocene, 23-24, 136-72. 

 Plessis, 127, 147. 

 Pleurotomaria hunterensis, 65. 

 Postglacial folds, 11 5-18. 

 Potsdam sandstone, 14-15, 48, 54, 60- 



63, 92, 97, 98, 114, 123, 129, 159, 161, 



170; age of, 66-68; faults, 120; 



fold, 115; inliers of Precambric 



rocks, 55; Precambric surface 



underneath, 54-60; quarries, 173; 



use as road rock, 173;- used for 



building and flagging purposes, 174. 

 Prasopora simulatrix, 91. 

 Precambric erosion, 53-54. 

 Precambric rocks, 24-54; faults, 118; 



folding, 109-12; joints, 104-6; 



petrography of, 175-87. 

 Precambric surface underneath the 



Potsdam, 54-60. 

 Prewisconsin glaciation, 164-72. 

 Prospect Park, 155. 

 Pyrite, 32, 35, 44, 49, 53, 64, 177, 181, 



183, 184. 

 Pyroxene, 29, 32, 33, 34, 35, 48, 49, 



50, 51, 52, 53, 119. 

 Pyroxenic limestone, 29. 



Quarry industry, 173-75- 



Quartz, 29, 32, 33, 34, 35, 3^>, 38, 39-. 



40, 41, 48, 49, 57, 61, 64, 177, 178, 



181, 182, 183, 184. 

 Quartzite, 30, 31-33, 37, 43, 47, 48, 50, 



5i, 55, 57, 59, 61 j gradation of 



granite into, 47. 



Rafinesquina incrassata, 83. 



minnesotensis, 83. 

 Redwood, 153, 162, 163, 177. 

 Redwood lakes, 151. 

 Reid, H. F., acknowledgments to, 



117; cited, 118. 



