Notes 0)1 the Dispersion of Drift Copper. 43 



is found in the formation in which it occurs, whether it is 

 uniformly scattered, or whether there is grouping in the dis- 

 persion, whether it is in lacustrine or true drift deposits, and 

 if in the latter, whether in modified or unmodified drift; 

 these particulars are rarely given. An attempt to bring to- 

 gether and map what can be obtained from the survey re- 

 ports of the several states, at once reveals the fact that the 

 observations on this subject have been of an extremely gen- 

 eral character. The following compilation is believed to in- 

 clude essentially all that has been printed, bearing on the 

 subject. 



In Ohio, Col. Whittlesey ' has noted a specimen from 

 Weymouth, Medina county, thirty miles south from Lake 

 Erie. This, so far as is known, marks the eastern limit of 

 the dispersion of copper. Again, in Clermont county^ 

 Prof. Orton, of the Ohio Survey,' notes the occasional 

 occurrence of fragments of copper in the bowlder clay. Ref- 

 erence is also made in the Ohio reports,' to the frequent oc- 

 currence of copper in the drift of the northwestern part of 

 the state, but no localities, or details as to its occurrence are 

 given. 



In Indiana, R. B. Warder, of the Indiana Survey^' notes a 

 specimen found at Weisburg, in Dearborn county, on Tan- 

 ner's Creek, weighing twenty-six ounces. Other specimens 

 also have been found in the adjacent counties, Ohio and 

 Switzerland. Still farther down, in the southwest corner of 

 the state, in Vanderberg count}^, small fragments have been 

 noted by Prof. Collett,' and a little to the north, the same 

 authority notes small specimens from Knox and Brown 

 counties. In Warren county, larger nuggets have been 

 found, and Prof. E. T. Cox " is authority for the statement 

 that some large pieces and many small ones have been found 

 in the drift both of northern and southern Indiana. 



' Smithsopian Contributions: On Fresh Water Glacial Drift of the North- 

 western States. 

 •-'Vol. I, p. 441. 

 3 Vol'. I, p. 87. 



* Indiana Geological Report, 1873, p. 403. 

 Geological Survey, 1875, p. 284. 

 Geological Report, 1878, p. 117. 



