Geoloyij of MattavHi (uul Offaira VnlleyH. — Taylor. 113 
the road which descends northward through a steep ravine. 
It is stony, gravelly drift with considerable sand and much 
white silt. A quarter of a mile south of this lake the slope 
on the west was explored and a horizontal zone of bowlders 
apparently washed free of other materials was found at about 
1.010 feet. From the top of the hill 50 feet higher the sur- 
rounding hills were seen to have a similar mark on their 
steeper slopes. No other littoral forms were seen and it is 
uncertain whether this feature is in reality a shore line. 
The second trip was made from Mattawa to Hurdman's 
farm about 21 miles south. About three miles out and at an 
altitude of about 720 feet a ridge of gravel and cobbles was 
found running north and south and exposed over lower 
ground, both east and west. The southern part is level, but 
it drops off slightly towards its north end. This was not cer- 
tainly identified as a beach, but may prove to be such on closer 
examination. At this level there is an undulating plain two 
or three miles wide and much of it is covered with a thin sheet 
of white silt with some clay. It is water-laid, and in some 
sections four to five feet deep was seen to be free of stones. 
It appeared generally to overlie stony drift, which outcrops at 
many places. In the drift itself the silt seemed to be the main 
fine ingredient mixed with the stones. It takes the place of 
clay largely in making up the ground moraine. The same 
character was freqviently seen in other places in this region. 
As observed on this excursion, the upper limit of the water- 
laid silt appeared to be at about 800 feet. From Roscoe's, six 
miles out, the road to Hurdman's is over a very rough, rocky 
country, for the greater part consisting of bosses of gneiss 
with half buried ravines between. The drift covering is gen- 
erally rather thin, and almost the whole stretch is thickly 
covered with bowlders. The average is a good size, a foot or 
more in diameter with many much larger, mostly angular and 
nearly all of varieties of gneiss or granite. Two terraces of 
tine sandy gravel were found at about 1,060 and 1,100 feet. 
Both were in a somewhat protected position in an east-west 
valley and covered with dense undergrowth. It is doubtful 
whether either is a beach. Nothing else suggesting submer- 
gence or a shore line was seen. Hurdman's house is about 
1,320 feet above sea level while some of theknol)sin the fields 
