358 The American Geolocfist. December, 1897 
W., along tlie road near senator Deedon's farm. (See plate 
XXII, fig. 1.) 
In all essential respects this last named exposure resembles 
the Taylor's Falls oceurrenee with the exception that it lies at 
an elevation of nearly 1,050 feet, or more than 100 feet higher 
than that. The two miles intervening between the tw'o areas 
shows continiially a sandy modified drift. The drift encoun- 
tered on the Wisconsin side of the river, along the wagon road 
eastward from the toll bridge and upon the shales, as shown 
in plate XXII, fig. 4, is typical eastern till. It is first seen at 
an elevation of (S80 feet and continues to an elevation of 950 
feet, where it suffers an interruption preventing further accu- 
rate observation. A quarter of a mile further south, on the 
road in the northern portion of Sec. 31, T. 34 N., R. 18 W., a 
slight removal of the soil again reveals the red eastern till at 
an elevation of 1,000 feet. This is regarded as a continuation 
of the section of eastern till resting upon the sandstones and 
shales as represented in fig. 3. The western drift has not been 
observed east of the river at this point. The characters indi- 
cating the presence of the eastern drift can be followed still 
further southward and to a still greater elevation. In the N. 
E. |, N.. W. I, Sec. 6, T. 33 N., R. 18 W., the road crosses the 
crest of the ridge. At this place, which is one mile south of 
the exposure in Sec. 31, red till is again exposed. The eleva- 
tion at this point is 1,150 feet. 
A mile still farther south the road descend* into the broad 
valley near the head of which is Dresser Junction. At that 
point the drift material changes very noticeablj'^ and the char- 
acters of w'estern drift ])redominate in the surface exposures. 
This is true of the whole valley, although some portions are 
much more sand covered than others. How far this western 
aspect extends into the bordering moraine is not determined, 
but the material observed upon the ridge is of eastern origin, 
which would seem to limit the western invasion at its western 
border. It is probable that this extensive moraine was not to 
any considerable extent developed by the w^estern invasion of 
the ice sheet. For the continuation of the moraine further 
northward seems wholly independent of western influence and 
is composed of eastern material. 
Origin and Periods of Accumulation, As to the origin of 
