;?56 The American Geologist. December, 1897 
Taylor's Falls, ravine road, gray drift, 50 ft., modified drift, 3-5 ft., 
red drift. 75 ft. 
Franconia, Lawrence creek gorge.* yellow drift, 20 ft., modified drift, 
50 ft., red drift, 50-75 ft. 
Senator Deedon's well, drift, 1*2-15 ft. 
Well, N. E. 14, S. W. li, Sec. 1, T. 3.3 N., R. 49 W., drift, 17 ft. 
St. Croix Falls, 2 blocks E. of toll bridge, red drift, 70 ft. 
Sections showing the thickness and character of different 
beds are represented by figs. 1, 2, 3 and 4, plate XXII. 
The northwestern part of St. Croix county, Wisconsin, is 
covered with glacial drift 40 to 60 feet in thickness in which 
kettle holes are a common feature.f 
The glacial debris lies in flat plains of modified drift, flat 
sand plains, rolling plains of till and a belt of characteristic 
morainic hills. 
Character. There are two sharply defined kinds of material 
represented in the drift of this locality. In certain respects 
this area is especial!}^ favorable for the study of these two 
kinds, which are called the eastern and western drift.J They 
occur in three layers. In most of the sections but one or two 
of these layers occur. That drawn for Taylor's Falls exhib- 
its all three of them, however, and a correlation of this sec- 
tion with those at other points makes such a division advis- 
able. Of these three layers the upper and lower are similar 
in character and probably identical in origin ; the middle layer 
is distinct from those above and below, and shows the charac- 
ters that are ascribed to the western drift. For the area on 
the west side of the St. Croix and a large part of the southern 
l)ortion of the district on the east side of the river, the pre- 
vailing downward succession in the drift is: first, a rather 
thick surface sheet of western blue or gray till; second, a 
variable layer of modified drift; third, red eastern drift lying 
upon the erc>ded preglacial rock surface. In the northern and 
eastern portions of the district, especially those portions lying- 
north and east of the village of St. Croix Falls, the prevailing 
character is that of the eastern drift. No exposure seen shows 
any of the western material. But on the west side of the St. 
Croix river at Taylor's Falls and, as appears from the relative 
*Geol. and Nat. Hist. Survey of Minn., Final Report, II, 1888, p. 112. 
fGeology of Wisconsin, vol. iv, 1882, p. 1.32. 
:|:Geol. and Nat. Hist. Survey of Minn., Final Report, vol. ir, 1888, p. 
410. 
