GLACIATION IN THE TELLURIDE QUADRANGLE 713 
ridge which extends to the southeast from this point. Just below 
the junction, on the north side of the stream, a distinct ridge begins, 
which is continuous to the edge of the glacial deposits made by the 
glacier moving down Lake Fork. ‘The crest of this ridge is from 30 
to 40 feet above the stream, and numerous sections show it to 
contain bowlders in variety such as occur to the east. The 
deposits made by the Lake Fork Glacier in the more recent epoch 
are characterized by an abundance of the light-colored granitic 
phase of the diorite-monzonite intrusions farther up the valley; 
but this diorite-monzonite is absent from the morainal ridge north 
of Turkey Creek just below the junction of the two branches. At 
the point where the stream crosses the eastern edge of the moraines 
of the Lake Fork Glacier, an exposure of drift on the south side of 
the stream about 75 feet in height shows diorite-monzonite bowlders 
in abundance and near the top of the exposure on the east side some 
stratified drift. 
Above the deposit (1), named above, the course of the north 
branch of the stream lies in a narrow, steep-sided channel, in which 
are exposed enormous masses of Telluride and San Juan rocks tilted 
at angles up to 45° upstream; no recognizable drift occurs near the 
stream until the boundary of the moraines already described is 
reached, at elevation 10,100 feet. The valley of the south branch 
of Turkey Creek above the junction has a gradient less steep than 
the north branch, but in this direction also no drift is recognizable 
until at the mouth of the first small tributary from the east an 
alluvial fan shows bowlders evidently derived from the edge of the 
glaciated tract a half-mile to the east. A little farther up the 
stream, the western slope has a covering of bowlders in variety 
continuous with the deposit next to be described, which covers the 
southern end of the 10,100-foot hill lying west of the south branch 
of Turkey Creek at this point. 
’ The deposits lying near the junction of the two branches of 
Turkey Creek are classed as older drift because of (1) their com- 
position, which is different from that of the Lake Fork glacial 
deposits to which they are adjacent; (2) their position in a narrow 
valley which meets the edge of the Lake Fork Glacier in an angle 
acute in the direction of motion of the glacier; and (3) the unglaci- 
