196 
Wisconsin Academy of Sciences , Arts and Letters. 
four miles along the side of the val¬ 
ley. Five miles down the valley on 
the other side another outcrop 
about an eighth of a mile long oc¬ 
curs. (See 2 on map.) It has the 
same thickness and general char¬ 
acter as the first mentioned. 
These two exposures are on the 
east fork of MacDonald’s Creek. 
On the west fork of this stream, at 
its source, a very extensive expos¬ 
ure is found. This valley is contin¬ 
uous with that of a stream flowing 
in the opposite direction, a branch 
of the East Kootanie. 
The western wall of this common 
valley is lined with a sheet of dio- 
rite (see 3) from the bed of the 
stream up to a height of a thousand 
feet. The slope is about 20° from 
the horizontal. For at least a half 
a mile this sloping wall of rock has 
been smoothed and planed by the 
ice, and so enduring is the rock that 
the glacial polish still shows plainly. 
This bed has about the same thick¬ 
ness as the others. 
A fourth exposure occurs a mile 
down the valley on the Kootanie 
side (see 4). 
Other exposures seen at a dis¬ 
tance occur north of Mt. Euger 
(see 5). 
The uniformity in the character 
of this rock, macroscopically at 
least, over such a large area is note¬ 
worthy. The same may be said of 
the manner of occurrence. The 
sheets have been intruded between 
the stratified beds so neatly as to 
present the appearance of being 
original members of the series. The 
thickness too is remarkably uni¬ 
form, averaging about fifty feet. 
The shales near the contact, above 
and below, have been abaked and 
