DEDUCTIONS FROM THE OCCURRENCE AND CHAR- 
ACTER OF TWO LARGE OUARTZOSE CONGLOM- 
ERATE BOULDERS OF UNKNOWN ORIGIN 
FOUND IN THE KANSAN DRIFT SHEET 
AT CENTERVILLE, IOWA 
BEN H. WILSON 
On a lawn at No. 629 West Maple Avenue, in Centerville, 
Iowa, are located two large quartzose conglomerate boulders which 
are of more than usual interest. These were removed from the 
glacial till during the process of excavating for the cellar under the 
dwelling now situated on the same lot and when found were said 
to be buried beneath several feet of drift material. 
These boulders are of about equal mass, however, somewhat 
different in shape, their dimensions being approximately 2x4x5 
and 2x4x6 feet respectively; and are of irregular outline. It is 
not often that one finds boulders of this character, of so great 
size as these, so far south in the drift, they being located only a 
few miles from the south line of the state. 
Fig. 1. Conglomeratic bowlder on lawn at 629 W. Maple Ave., Centerville, Iowa. 
The hat which is about twelve inches in diameter lengthwise, will serve for 
comparison in judging the size of the boulder. 
