Copper and Silver of Kewenaw Point, Lake Superior. 81 
this phenomenon, although the presumption is, that the animal 
was some Batrachian reptile. It is not improbable however, but 
the entire aggregate of impressions were made by the posterior 
feet and limbs, the fore feet not reaching the ground, after the 
fashion of the kangaroo. ‘This method of locomotion would cer- 
tainly be adapted to the turbulent era in which the animal lived. 
But I will not indulge in speculations, contenting myself with 
reciting facts, and leaving it to the learned reader to draw the in- 
ference. i 
I have also drawn from this prolific rock, other marvellous 
signs of once living creatures, to the interpretation of which, I 
know of no analogies to apply. The study of the sandstone fos- 
sils, grows intensely absorbing. It incessantly reveals to our ad- 
miring eyes, new modifications of ancient life, which, although 
they seem incomprehensible, are nevertheless authentic evi- 
dences of harmonious creation. 
Greenfield, Mass., May 21, 1845. 
Art. X.—On the Copper and Silver of Kewenaw Point, Lake 
Superior ; by C. T. Jackson, of Boston. 
A BRIEF description of the geology and mineral resources of 
Lake Superior, may not prove unacceptable, at a time when pub- 
lic attention is called to that region, and mining enterprises are 
about to be entered into by many individuals and companies, 
some of whom have already gained valuable information concern- 
ing the most important mines, while others may be acting under 
erroneous impressions and hopes which may not be fully realized. 
The earliest accounts of the metals found on the coast of this 
lake, are those of Alexander Henry, who travelled around its 
shores in the years 1760 and 1776, and published his researches 
in 1809 in an octavo volume—printed in New York; and of Capt. 
Jonathan Carver, who visited the lake in 1766, and published 
his travels in a similar volume in Philadelphia in 1796. Both 
Henry and Carver describe numerous loose pieces of metallic 
copper, found on the lake shore, and express a favorable opinion 
of the probable value of the country for mining purposes, Mr. 
Norberg, ‘‘a Russian gentleman acquainted with metals,” who 
accompanied Mr. Henry, discovered, among the pebbles and 
Vol. xtix, No. 1.—April-June, 1845. sf ae 
