X CONTENTS. 



CiiAPTEi! III.— The Fei-cii Mountain range— Continued. Page. 



Section VI.— Tlie Mansfield schists HI 



Distribution, exposures, and topography -tH 



Petrographical characters •bi- 

 section VII. — The Groveland formation US 



Distribution, exposures, aud topography. "115 



Petrographical characters il" 



Section VIII. — The raica-schists and quartzites of the Upper Huronian series 423 



Pctrographical characters ■'2.5 



Section IX.— The intrusives ^26 



Chapter IV.— The Miciiigamme Mountain and Fence River areas 427 



Section I.— The Archeau 428 



Section II. — The Sturgeon formation 430 



Section III.— The Raudvillc dolomite 431 



Distribution aud exposures 431 



Folding and tliickness 432 



Petrographical characters 434 



Section IV.— The Jlanslicld formation 437 



Distribution, exposures, and topography 438 



Folding and thiclcuess 438 



Petrographical characters 439 



Section V.— The Hemlock formation 440 



Distribution, exposures, and topography 440 



Folding aud thickness 441 



Petrographical characters 442 



Section VI. —The Groveland formation 446 



Distribution, exposures, and topography 446 



Folding aud thickness 448 



Petrographical characters 448 



Chapter v.— The northeastern area and the relations between the Lower Mar- 

 quette and the Lower Menominee series 451 



Chapter VI.— The Sturgeon River tongue, by William Shirley Bayley 458 



Description and boundary of atea 4o8 



Literature 4o9 



Relations between the secliment.ary rocks and the granite-schist complex 461 



The Basement Complex 463 



The gneissoid granites 463 



The amphibole-schists 465 



Origin of the amphiliole-schists ■ 466 



The biotitc-schists 467 



The intrusive rocks 469 



Comparison of the Sturgeon River and the Marquette crystalline series 470 



The Algoukiau trough 471 



Relations between the conglomerate and the dolomite series 472 



Relations between the dolomites and conglomerates and the overlying sandstones 473 



The conglomerate formation 473 



Important exposures 474 



Petrographical descriptions 477 



The dolomite formation 479 



Important exposures 480 



Petrographical descriptions 481 



Slates and sandstones on the Sturgeon River 481 



The igneous rocks 482 



The intrusive greenstones 482 



Petrographical description 482 



The banded greenstones 485 



Petrographical description 486 



