132 Twenhofel — Granite Bowlders. 



Art. IX. — Additional Facts Relating to the Granite 

 Bowlders of Southeastern Kansas; by W. H. Twen- 

 hofel. 



Since the writer described the granite bowlders which 

 occur near Rose, Woodson County, Kansas, 1 some addi- 

 tional facts have been discovered. These are given in 

 this article. 



At the time the bowlders were first described, different 

 hypotheses relating to their origin were considered and 

 the one which ascribed their presence to the agency of 

 floating ice was accepted .as best harmonizing with the 

 observed facts. The most reasonable source for the 

 bowlders was suggested as being to the southeast. 



Subsequently Darton suggested 2 that the parent rock 

 is probably to be found on the northern end of the buried 

 mountain ridge of Central Kansas, since there its summit 

 comes within 600 feet of the surface. At the time the 

 bowlders were discovered very little was known of this 

 buried ridge. Granite had been reached in several wells 

 in Central Kansas and fragments of this granite had been 

 brought to the surface. Some of these had been exam- 

 ined by the writer and found to be altogether unlike the 

 rock of the Rose bowlders and it was considered quite 

 improbable that any connection existed between them. 

 Later, descriptions of granitic rocks from a number of 

 other wells were published 3 and recently, through the 

 kindness of Professor C. E. Decker of the University of 

 Oklahoma, an opportunity was given of examining 

 several small pieces of granite which came from the Kauf- 

 man well, near Elmdale, Chase County, Kansas. In no 

 respects do any of these fragments resemble the rock of 

 the Rose bowlders, and the published descriptions do not 

 suggest that rock similar to that of the Rose bowlders 

 has been found. Facts of this nature, however, mean 

 little. There may be, and probably are, scores of varie- 

 ties of rock in this old ridge, and it is absolutely certain 

 that only a few of them have been reached by the drill, 

 so that the ridge must be considered as a possible source 



1 This Journal, 43, 363-380, 1917. 



2 Darton, N. H., U. S. Geol. Surv., Bull. 691-A, 5, 1918. 



3 Moore, E. C, and Haynes, W. P., Kansas Univ. Geol. Surv., Bull. 3, 

 140-169, 1917. Complete references are given in this work. 



