A GLACIAL GRAVEL SEAM IN LIMESTONE AT 
RIPON, WISCONSIN! 
F. T. THWAITES 
University of Wisconsin 
Just west of the city of Ripon (S.E. % of N.W. 3, Sec. 20, T. 
16 N., R. 14 E.) is a limestone quarry belonging to Mr. William 
Kroll. This locality (Fig. 1) displays a phenomenon of unusual 
interest, namely, a seam and pockets of glacial gravel within the 
Paleozoic rocks. 
In 1914 the writer visited this quarry in company with E. O. 
Ulrich, United States Geological Survey, W. O. Hotchkiss, state 
° too 200 300 FEET 
Fic. 1.—Sketch map of Ripon limestone quarry. Topography adapted from 
U.S. Geological Survey, contour interval 20 feet. 
geologist of Wisconsin, and Edward Steidtmann. Further field 
work was done in 1915 in company with Lawrence Martin and 
Walter H. Schoewe, and in 1919. The writer is indebted to all 
of these persons for assistance, criticisms, and suggestions.” 
t Published by permission of the state geologist of Wisconsin. 
2 Lawrence Martin, “‘The Physical Geography of Wisconsin,” Bull. 36, Wisconsin 
Geol. and Nat. Hist. Survey, 1916, pp. 250-51. 
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