6 4 



NEW YORK STATE MUSEUM 



Maclurea (?) cf. affinis, 47 

 oceana, 47 

 transitionis, 47 



Macomb bathylith, 19 



Macomb granite, 13, 17, 18, 19, 25, 26 



Marble, 13 



Martin, Doctor, J. C, 16, 19 



Mesozoic history, 58 



Mica schists, 15 



Morainic belt, 10 



Morristown, 26, 36, 39, 53; general- 

 ized section at, 31 



Mount Lona, n 



Mud lake, 14 



Oak Point, 26 



Ogdensburg formation, 23, 37; sum- 

 mary of section, 50 



Ogdensburg quadrangle, 8, 9, 10, 26, 

 27 



" Ophileta " 

 compacta, 47 

 grandis, 47 



Ordovician formations, 35 

 time, 56 



Orthogneiss, 18, 19, 20 



Oswegatchie river, 9 



Paleozoic history, later, 57 

 Paleozoic plain of the St Lawrence 



valley, general breadth, 8 

 Paleozoic rocks, 12, 17, 23 ; structures 



of, 52 



Pleurotomaria hunterensis, 33, 35 

 Point Comfort, 26, 53 

 Porphyritic granite, 15, 20 

 Potsdam, 51 

 Potsdam sandstone, 12, 14, 15, 17, 20, 



23, 25, 27, 55 



Precambrian rocks, 12, 19, 23, 27 

 Precambrian surface, character of, 24 

 Precambrian time, 53 

 Pythian Home, section at, 41 



Quartz schists, 13, 14 



Quartzites, 13, 14, 15, 22, 25, 26, 27 



Quaternary history, 59 



Raquette river, 9 



Red Mills, 50 



Red Mills quadrangle, 8, 10 



Rockaway point, 50 



Ruedemann, R., work of, 7, 35 



Rusty gneiss, 14, 16 



St Lawrence river, 10 

 St Regis river, 9 

 Sandstones, 13 

 Schists, 13, 14, 15, 16, 23, 25 

 Seely, H. M., work of, 38 

 Shales, 13, 15, 16 

 Syenite, 12, 13, 17, 19, 20 

 Syenitic eruptives, 13 

 Syntrophia lateralis, 48 



Tertiary history, 58 



Theresa, 36 



Theresa formation, 23, 25, 28 



Theresa quadrangle, n 



Thousand Islands region, 12, 14, 22, 



25 



Tilden, 50 



Topography, general, 9 

 Trap, 13, 55 

 Trap dikes, 13, 21 

 Trenton limestone, 23 

 Tribes Hill formation, 23, 29, 34, 35, 



5i 



Tryblidium cf. ovatum, 47 

 Turritospira cf. anna, 48 



Ulrich, E. O., work of, 7, 28, 33. 34, 



35 ; cited, 47, 48, 56 

 Utica beds, 23 



Woodworth, J. W., cited, 60 



