GLACIATION IN THE TELLURIDE QUADRANGLE 521 
Miguel any débris which the glacier in the latter may have carried 
at its margin. On the west side of Mill Creek a morainic ridge 
- extends in a direction south of west from an elevation of 9,500 feet 
down to about 9,100 feet; but this ridge is probably chiefly due to 
ice from Mill Creek rather than to that coming down the San 
Miguel valley. 
No further remnants of a lateral moraine occur on the north side 
of the San Miguel valley until a point is reached about three-fourths 
of a mile east of Remine Creek at an elevation of 9,500 feet; begin- 
ning here, glacial débris forms the top of the ridge extending south 
of west to Remine Creek. At its eastern end this ridge is not so 
well marked as the moraine on the south side of the valley; farther 
west the ridge is more pronounced. One noticeable feature of this 
part of the moraine is the number of large bowlders which lie upon 
its southern slope. The elevation of the east end of this ridge, 
9,500 feet, is about 300 feet higher than the crest of the lateral 
moraine on the opposite side of the San Miguel valley. This 
difference in elevation is probably the result of the change in 
direction of the course of the valley of the San Miguel. It will be 
noticed that at a point about halfway between Eder Creek and 
Remine Creek, the San Miguel River changes its course from north 
of west to south of west, a change of about 25°. The ice having 
motion in a north-of-west direction before reaching this point 
would not change its direction of movement readily, and so would 
crowd up on the north side just below the point in the valley where 
the change of course takes place. 
Siriae and striated bowlders in the San Miguel valley.—Striated 
bowlders occur in abundance in the drift in the San Miguel valley, 
both in the moraines near Keystone, and at practically all points 
farther east where there is any considerable accumulation of 
glacial débris. 
Striae on rock in place were observed at three different locations, 
all on the north side of the valley; in each place a part of the 
striae are on a rock face of steep slope, and show dip in an upstream 
direction. This upstream dip is interpreted as being the result of 
the crowding-up of the glacier on the north side of the valley, due 
to the force of the ice entering from two southern tributaries, viz., 
