GEOLOGICAL AND NATURAL HISTORY SURVEYS. 195 



1S45. The other was prepared by Bela Hubbard, late assistant 

 State geologist. 



These reports do not embody any considerable amount of new mat- 

 ter. They treat the subject under the subdivisions made by Doctor 

 Houghton in his Fourth State Iveport and reproduce Doctor Hough- 

 ton's views. As the reports were drawn up for general readers, to 

 whom Doctor Houghton's reports would be probably unknown, they 

 embrace many repetitions of matters coutained in the State reports. 

 Some of the more important additions will be here mentioned.' 



Judge Burt's report covers Keweenaw Point and the country from 

 Chocolate River to Carp River, along the south shore of Lake Su- 

 perior. He treats of the topography and other matters under the fol- 

 lowing heads: Soil and timber; Streams and harbors; Trap range 

 of Keweenaw Point, etc.; Lake coast harbors; Rivers; Porcupine 

 Mountains; Geology, Primary rocks; Argillaceous slates; Red and 

 variegated sandstone; Conglomerate rock; Veins and limestone. 

 Then, proceeding westward from Keweenaw Point, he discusses Ar- 

 gillaceous slates; Red sandstones; Trap and conglomerate rocks of 

 the Porcupine Mountains, and drift. 



Speaking of the mctamorphic rocks stretching southwest from the 

 lower falls of the Riviere du Mort, he says: 



A few veins of quaftz were seen traversing these rocks, but no one was ob- 

 served to be metiilllierous. I have, however, seen specimens of specular iron 

 ©re said to have been obtained in township 4S north, range 2G west. 



In respect to the primary rocks he says : 



No vein indicating a worlcable quantity of metal of tuiy kind was observed ; 

 but it should not be inferred from this that they do not exist here. 



As to the veins, in addition to treating them nearly in the same 

 manner as Doctor Houghton had done, he writes that " their metal- 

 liferous character is developed along the junction of the trap and 

 sedimentary rocks on both sides of the trap range." Doctor Hough- 

 ton had only spoken of it on the north side. 



The argillaceous slates previously reported by Doctor Houghton 

 on the southeast side of Keweenaw Bay are reported by ^Ir. Burt 

 S or 4 miles east of the Porcupine Mountains, Avhere they dip 15 to 

 45'^ in a direction between northeast and southeast. From these 

 facts Mr. Burt infers that they pass under the sandstone to the east 

 of them. 



The red sandstone west of Keweenaw Point is supposed to belong 

 to the same formation as that to the east. "Its general character is 



» Senate Doonments, Isf soss., 2nili Confr.. 1845-40. vol. 7. Dnp. :?."7. '_'!> pp. These 

 reports are lepiintofl in Mhieral Region of Lake Superior. By -lucob IIon!,'liton, ir. pp. 

 82-123. 1846. 



