IRIE SIE RE EIEIO ARS

by the head of the canyon at the southern limit of the Elvira
lease (No. 402). No further northward extension of the chan-
nel is known beyond the point already mentioned.

Two bed-rock channels are believed to be on the Peacock
lease (No. 345). One, a buried late Tertiary channel probably
lies to the east of and below the level of Barrington's camp.
The second bed-rock channel lies beneath creek-level to the
west of the camp. The latter channel is filled with bedded
clay and clayey gravel. In order to avoid the dat £2 GUL Gyr Or.
explaining a pre-glacial diversion of Wheaton Creek and to
avoid the postulation that the entire rejuvenation of the
Turnagain River and its tributaries was interglacial, this
second bed-rock channel is considered to be interglacial.

Bedded clay and clayey gravel were deposited in the bot-
tom of the channel after the completion of the bed-rock chan-
nel cutting and, just prior to there-advance of the ice. This
was followed by the last glacial ice advance.

Down-cutting by Wheaton Creek has been continuous since
the wane of this last ice advance. The wasting of the ice
gave greater volume to Wheaton Creek and its erosive power
was made effective by the lowering and disappearance of ice
in the Turnagain valley. In the upper stretch of Wheaton
Creek valley the creek has re-occupied and re-excavated the
valley formerly occupied in pre-glacial and interglacial time;
but for a stretch north of the Peacock lease, the creek coin-
cides with neither the pre-glacial nor interglacial channels.
In its post-glacial downward cutting the creek cut a canyon
between the southern limit of the Elvira lease (No. 402) and
Wheaton's camp. North of the camp the creek coincides with an
earlier channel and has re-excavated and cut below the pre-
glacial course of the stream.

LODE-DEPOSITS

Quartz veins and stringers outcrop in many places around
Wheaton (Boulder) Creek. Many are narrow stringers or vein-
lets running parallel to the formation, others cut across it.
Although most of them are narrow, some attain a width of 3
feet but, as a general rule, the outcrops of even the largest
can not be traced far before they disappear or are covered
with over-burden.

The quartz veins are found largely in the sedimentary
series. The slate and schist north of the lake towards the
head of Wheaton Creek contain many stringers; other veins and
stringers were seen in the slate on the ridge top west of

sapere.