X 



CONTENTS. 



Pace. 



Franklin corNTY (continued). 



Maloneorc, 331 



Potsdam sandstone, 331 



Calciferous sandrock, 332 



Drift and surface materials, 333 



Soil and superficial deposits, 334 



St. Lawrence COUNTY, 33o 



Geological divisions, 33|* 



Hypersthene and granite, 33/ 



Primary limestone, 340 



Gneiss and hornblende, 340 



341 

 Iron ores, 



^47 

 Magnetic ores, 



Bog iron ore, 348 



Kensseiacritc, 3.30 



Steatite or soapstone, 352 



Galena and lead, 3.54 



Coal-hill mine, 355 



Victoria and other lead mines, 358 



Potsdam sandstone. . .' 3G0 



Calciferous sandrock, 361 



Superficial covering, drift and boulders, 364 



Simple minerals, 30o 



Recapitulation, 366 



Jefferson county, 368 



Rivers, valleys and surface, 368 



Primary rocks, 373 



Rensselaerite, 3/o 



Iron ores, 376 



Potsdam sandstone, 37 / 



Calciferous sandrock, 380 



Jefferson county (continued). 



Birdseye limestone, 382 



Isle la Motte marble, 386 



Trenton limestone, 387 



Utica slate, 397 



Loraine shales, 401 



Grey sandstone, 406 



Extension of the New- York system 



in Canada, 407 



Gulfs of Loraine and Rodman, 408 



Distribution of drift and boulders, etc. 410 



Recapitulation, 413 



Hamilton county, 414 



Mountains, surface, lakes, 414 



Primary and sedimentary rocks, .... 416 



CHAPTER XI. 



Some of the common substances which may 



be employed for economical purposes, . 418 

 Economical materials existing in the form 



of rocks, 418 



Economical materials in the form of simple 

 minerals, 420 



CHAPTER XII. 



On drift; grooves and scorings of rocks; 

 hypotheses ; depression or submergence, 

 smd gradual rise ; glacial theory, etc. . . 422 



Tabular view of the sedimentary rocks of 



the Second district, 429 



List of engravings, 431 



