46 Wisconsin Academy of Sciences, Arts and Letters. 



Prof. Irving' says further that fragments of copper are 

 far more abundant in Wisconsin than elsewhere, and far 

 more abundant here than has been commonly supposed, and 

 that specimens of forty to fifty pounds weight are not un- 

 common, and have been made of economic use. It is stated 

 by E. T. Sweet,' on the authority of Mr. S. Vaughan, that a 

 copper bowlder of seventeen hundred pounds weight was 

 formerly taken from the bed of the Sioux river, six miles 

 south of Lake Superior, and that a bowlder of one hundred 

 pounds weight was taken from Outer Island only a few 

 years ago. 



Col. Whittlesey' speaks of the copper drift in Wisconsin 

 and northern Michigan as follows: " A copper rock weigh- 

 ing three thousand pounds was found in the red clay on the 

 west fork of the Ontonagon river. One was found in 1845, 

 opposite La Pointe, on the mainland, weighing eight hun- 

 dred pounds. Three miles south of the Minnesota Mine on 

 middle fork of the Ontonagon, another copper bowlder was 

 taken from the red clay, which weighed between three and 

 four hundred pound?. In a well in Madison one was found 

 at a depth of twenty feet, having a weight of thirty pounds." 

 At the mouth of the Menominee river a chunk three or four 

 pounds in weight has been found, and another at the mouth 

 of the Oconto of about the same size, while a much larger 

 piece was taken from the Pesaukie river. In Walworth 

 county, near the state line. Col. Whittlesey also notes a boulder 

 of forty or fifty pounds weight. Copper has also been no- 

 ticed from Ripon and Kenosha in gravel beds. In addition 

 to these occurrences cited by Col. Whittlesey, Prof. Cham- 

 berlin has had record of about thirty specimens from Wal- 

 worth county. Aside from these, one was recently found at 

 Geneva Lake which weighed upward of seven pounds. 

 Prof. Chamberlin is authority for the statement that 

 a specimen of one hundred and fourteen pounds weight 

 was taken from Newark, Rock county. This bowlder had 

 also attached to it fragments of Lake Superior Keweenawan 



' Wisconsin Geological Report, vol. 3, p. 619. 

 - Wisconsin Geological Report, vol 4, p. 353. 

 " Smithsonian Contributions, 1866. 



