GEOLOGICAL EXPLORATIONS AXD LITERATURE. 29 



Two roiids were soon coiistnicted to the iiiinenil il(^po,sits tbrouf;li the dense ever- 

 greeu forests of this hititiule. One of them comiueneed at the hike, near the mouth 

 of the Montreal river, and near tlie terminatiou of the fourth principal meridian, 

 exteudiug theuee south and not far fioni tlic meridian line. The other began on 

 Chegoimegou bay, at .Ashland, i)ursuing also a southerly course, and, after reaehiug 

 the second range, connected along it to the eastward with the first road, passing 

 the cabins of the preemptors. In 1850, Mr. Daniels, of the Wisconsin Geological 

 Survey, and Mr. Lapham, <if Milwaukee, examined the iron rantje in behalf of a com- 

 j)any which had nuuk' extensive purchases there and had caused a survey lor a rail- 

 way to be made with a view to the manufacture of iron (pp. 'io.j-L'ST). 



The tbllowiug is a general view of the structure of the formations in the descend- 

 ing order: — 



Form<(tioH Xo. 1. — Fotudam Saitilstone. On the Montreal river, .strike northeast 

 by east, in places N. 60- E. ; dip northwest by north, 75° to 'JO^. It embraces four 

 members, a. h, c, and (1. 



Fei-t. 



a. Sdiidsloiic 2)ro2)er, corrected for bevel, thickness S,.iOO 



b. Alternations of sandstone and black slate, thickness 750 



e. Conglomerate, thickness 1,S(»0 



(7. Alternatinns of traj) and sandslone, thickness S(»0 



Total 1I.S5() 



Formation Xo. 2. — Trappose, in tiro members. 



Miles. 



a. Brown amygdaloid; dip and strike conformable to for- 



mation 1 ; thickness along lac Flambeau trail 3i 



b. Compact red and 1 >lue 2J 



Total 



Formation X<>. :i. — Hi>rni)lrnilic. 



Compact, subcrystalline and slaty; black or dark colored; 



strike N. 60° E.; thickness on trail L'J 



Formation Xo. 1. — iSiliceotis, tiro mrmlnr.s. 



a. Quartz, slaty, anil in layers; dark colored, but less than for- 



mation ;!; thickness variable; separated from /> by a 

 bed of magnetic iron ami iron slate. 



b. Quartz, slaty, in layers and Ix'ds; niorecom])act and lighter 



color (gray and straw color) than a; novaculite; strike 

 N. 60O to 65-^ E.; dip variable, 30°, 45°, 60o, 75° to the 

 northwest; bi-eadth across the edges on trail 3i 



Formation Xo. 5. 

 Granites and syenites of central ^VisconsLn Qtp. 238-239). 



