X CONTENTS. 



Limestone in Stoneham and Newbury, - 312 



Origin of Limestone, 313 



SCAPOLITE ROCK : Mineralogical Characters, - 314 



QUARTZ ROCK : Order of superposition in the older rocks, 316 



Mineralogical Characters of Quartz Rock, - 317 



Its Topography, - ^ 320 



Dip, Direction, and Character of the Strata, 322 



Mineral Contents, - 323 



Theory of Quartz Rock, - 324 



MICA SLATE : Mineralogical Characters, 32? 



Its Topography, - 331 



Its Stratification, with the Dip and Direction of the Strata, 337 



Veins of Segregation in Mica Slate, 341 



Mineral Contents, - 342 



Theory of Mica Slate, 349 



TALCOSE SLATE : Its Definition, - 352 



Mineralogical Characters, - 353 



Its Topography, 355 



Dip, Direction, and Character of the Strata, - 358 



Mineral Contents, - 359 



Theory of Talcose Slate, - 364 



SERPENTINE : Mineralogical Characters, - 365 



Topography, Stratification, and Associated Rocks, - 366 

 Mineral Contents, v - - ;'.?*> - 371 



Theory of Serpentine, 'ifftlfn 372 



HORBLENDE SLATE : Dr. Macculloch's Views, 373 



Its Mineralogical Characters,' - - 374 



Its Topography, 377 



Dip, Direction, &c. of the Strata, - 380 



Mineral Contents : Theory of Hornblende Slate, - 381 



GNEISS : How distinguished from Granite, - 382 



Its Mineralogical Characters, - 383 



Its Topography, - , 385 



Its Stratification : Dip and Direction of the Strata, 390 



Mineral Contents, - - -. - - 395 



Theory of Gneiss, 400 



UNSTRATIFIED ROCKS. 



Modes in which they occur and their theory, - 403 



Manner of representing them on the Map, - - 404 



GREENSTONE : Its Definition, &c. - - - 404 



Its Mineralogical Characters, .<<- j - - - - 405 



Its Topography, 412 



Relative Position of the Greenstone of Massachusetts, - 417 

 Veins of Greenstone, - - 425 



Chemical effects of Greenstone upon other rocks, 429 



Mineral Contents, - 433 



