326 GEORGE F. KUNZ 



Kentucky.— Cabin Fork creek, Russell county, one. 



Michigan. — Dowagiac, Cass county, one of lOf carats. 



Ohio. — Milford, Clermont county, one of 6 carats. 



Tennessee.— Koko creek, Tellico river, Monroe county, 

 several reported. Union Crossroads, Roane county, one of 

 3 carats. Luttrell, Union county, one of Ifi carats. 



Wisconsin.— Plum creek. Rock Elm township, Pierce 

 county, several very small stones. Oregon, Dane county, one 

 of 3}g carats. Kohlsville, Washington county, one of 21 

 carats. Saukville, Ozaukee county, one of 6f carats. Eagle, 

 Waukesha county, one of 15il carats. Burlington, Racine 

 county, one of 2j\ carats. 



The whole subject of the Indiana occurrence is fully de- 

 scribed by the state geologist, Prof. W. S. Blatchley, in his 

 annual report for 1902. The geological features of the region 

 are first treated with special reference to the distribution of the 

 drift deposits in central Indiana. These have been known 

 since 1850 to contain gold, and a large amount of local prospect- 

 ing and panning has been carried on along the streams for 

 years. The gold is found associated with magnetic iron sand, 

 menaccanite, and other heavy minerals. It is in these aurifer- 

 ous sands that diamonds have been found at intervals for some 

 twenty five years, but especially of late. Some of the dia- 

 monds belong certainly in the second, or later, drift, like most 

 of those in Wisconsin ; others found south of that line but within 

 the margin of the older drift belong, perhaps, to the older de- 

 posits instead of having been washed out from the later beds 

 and carried south by streams, as formerly supposed. The 

 terms earlier and later are now frequently replaced by Illinoian 

 and Wisconsin, and designate the two glacial drifts, but these 

 terms may be misconceived as to their geographical significa- 

 tion and hence require explanation. The center of ice move- 

 ment in the glacial era was determined some years ago by Can- 

 adian geologists as having traveled or shifted toward the east 

 from the west. Of the two ice invasions that spread over the 

 northern United States, the earlier is called by some geologists 

 the Illinoian, as having covered a large part of that state not 

 reached by the later one ; while the name Wisconsin is applied 

 to the later by Prof. T. C. ChamberUn, because it extended 



