As the sun rose
higher rocks were loosened on shattered portions of the cliffs, and came
down in rattling avalanches, echoing wildly from crag to crag.
The main lateral moraines that extend from the jaws of the amphitheater
into the Illilouette Basin are continued in straggling masses along the
walls of the amphitheater, while separate boulders, hundreds of tons in
weight, are left stranded here and there out in the middle of the
channel. Here, also, I observed a series of small terminal moraines
ranged along the south wall of the amphitheater, corresponding in size
and form with the shadows cast by the highest portions. The meaning of
this correspondence between moraines and shadows was afterward made
plain. Tracing the stream back to the last of its chain of lakelets, I
noticed a deposit of fine gray mud on the bottom except where the force
of the entering current had prevented its settling. It looked like the
mud worn from a grindstone, and I at once suspected its glacial origin,
for the stream that was carrying it came gurgling out of the base of a
raw moraine that seemed in process of formation. Not a plant or
weather-stain was visible on its rough, unsettled surface.
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