494 
Buell—Bowlder Trains. 
defined area appears on the rim of limestone that borders the 
marsh basin of the Crawfish in the township of Milford, east of 
Lake Mills. This edge of the rock strata was well exposed to 
the action of the westward moving ice mantle but was measur¬ 
ably protected from degradation from a glacial movement down 
the valley, hence the preservation on portions of its surface of 
striations produced by the earlier drift movement. Two brief 
surfaces exposed in roadway sections, near the river, showed 
striae S. 60° W. Another in a railroad cut east of Lake Mills 
station showed deep grooves extending S. 40° W. 
Near the margin of the lobe, where the thinned edge of the 
ice exerted less abrading power, the action of the earlier glacia¬ 
tion is more commonly preserved. On a rock surface uncovered in 
a roadway section -across the end of a well marked drumlin, 
whose axis lies almost upon the meridian line, the striae show 
a direction S. 50° W. Several rock surfaces uncovered in wells 
and cellar bottoms in the neighborhood of Milton show essenti¬ 
ally the same direction and one in the southwest corner of Dun¬ 
kirk township, near Cooksville, bears also striae S. 50° W. 
Outside of the Green Bay lobe, striae observed at several 
points beneath the thinner portions of the old drift, indicate a 
still more westerly movement of the ice mantle. One of these 
was noted in the bottom of a roadside gully near the west line 
of Clinton township, northeast of Beloit. The striae here are 
S. 75° W. Two surfaces, on the west side of the river near 
Rockford, show the same direction, and one set near the crest of 
the limestone ridge just west of the city of Beloit bears directly 
west. 
Upon the high limestone underlaid and heavily drift-covered 
area, that lies between the overwash plain of the Kettle 
Moraine in Walworth county and the level, gravel-filled valley 
of the Bock, the surface .shows many drumlin forms which have 
the same axial direction as the striae just described. These are 
most abundant in the townships of Bradford and Clinton, Rock 
county, and in Sharon, Walworth county, but several very prom¬ 
inent forms are found in the townships of Manchester and 
Caledonia in Boone county. Four or five less distinct forms ap¬ 
pear also on the broad limestone divide between the Rock and 
