Agassiz.] 244 [Junes, 



gold belt passed through Plymouth and Bridgewater ; the 

 talco-mieaceous slates contain gold, both in the slates them- 

 selves and in the quartz veins. The value varied from four 

 dollars to twelve dollars per ton. He had obtained speci- 

 mens showing visible particles of gold which he would at 

 some time jjresent to the Museum. 



Maj. Lewis Cabot of Brookline, Dr. A. C. Garratt and 

 Messrs. Charles B. Brigham, William Parsons, B. B. Wil- 

 liams and C. J. Whitmore, were elected Resident Members. 



June 5, 1867. 



Mr. C, K. Dillaway in the chair. Thirty-two members 



jDrescnt. 



The following papers were read : — 



On the Position of the Sandstone of the Southern Slope 

 OP A portion of Keweenaw Point, Lake Superior. By 

 Alexander Agassiz. 



Foster and Whitney, in their Report of the Lake Superior min- 

 eral district, represent the sandstone on the south side of the trap 

 range of KeweenaAv Point, as dipping south and resting conformably 

 upon the beds of trap of the north side of the anticlinal axis of Ke- 

 weenaw Point. This anticlinal axis formed by the Bohemian Moun- 

 tain, as asserted by Foster and Whitney, is not found further south as 

 far as I have had occasion to examine. In two of the ravines cut 

 through the sandstone by creeks flowing in an easterly direction from the 

 crestof the range towards Torch River, near the head of Torch Lake, 

 Ave find good exjxjsures of the sandstone, and in two points, one of 

 which was examined by Foster and AVhitnoy, we find the sandstone 

 resting unconformably upon the trap which has still the same northern 

 dip as further west, of about 42°. The sandstone within a distance of 

 one hundred feet from the trap, dipping north 42°, lies horizontally, 

 or rather has at the outside an inclination of 1^° or 2° south. The pe- 

 culiar bed of chloritic rock, so characteristic of the junction of trap 

 and sandstone as described by Foster and Whitney, is well marked. 



