j\f>i!r (jhivicr R('<ii<}iK Ahixla. — ( 'iixJutKj. '1'1\ 
gravels have been cut away. Those found on the eastern side are 
along the beach, and are now onl}- exposed at low tide, some be- 
ing just at low tide level. This floor was a sloping one, rising 
gently toward the mountains. The deposits on it were laid down 
b}' swift currents, and their material had not suffered attrition 
for any great length of time. Yet it is all considerably rounded 
and must have been transported some little distance. At least 
some of it came from the north. From this it follows that these 
layers of sand and gravel were deposited from the swiftly flowing 
streams that emerged from the front of the glacier as it advanced 
toward this spot, aided no doubt, b)' streams down the mountain 
sides adjacent, and on the western side from the Dying glacier 
valley. Suljsequently the advancing glacier overran them. 
Chang(s af hvrl In tlir icy ion. — Prof. Wright explains the 
thickness of the sand and gravel deposit on the western side of 
the inlet by the supposition that the Dying glacier would, in its 
advance, protrude from the end of its valle}' before the advanc- 
ing Muir glacier reached that spot, and from a kind of dam, or 
breakwater, against which these deposits would be built*. This 
is a pure supposition, there being no evidence that such protru- 
sion would occur first. Nevertheless it might l)e admitted were 
it not for the fact that it does not aid in explaining the hight of 
the gravels on the western side south of Dying glacier valley, nor 
does it help us at all in accounting for the even greater altitude 
reached on the eastern sule of the inlet. I find myself totally 
una])le to account for the accumulation of deposits of such a 
character and in such a location to hights of HOO and -lOO feet 
a))ove the surface of the inlet, with the relative levels of sea and 
land remaining as at present. Should the ice be now removed 
from the amphitheatre a consideral)le part of it at least would be 
covered by sea water, with low sloping shores between the water 
and the mountains. As the amphitheatre became filled with ice, 
on the advance of the glacier, it is impossible to conceive of the 
building up of deposits l)v the streams of the vicinity to any 
considerable hight above tide water. The material would have 
been washed into deep water. But such a deposit could easily 
have been l)uilt up on a slowly sul)siding shore. In order to es- 
tal)lisli such an hypothesis it is necessar}' to produce evidence of 
a downward movement of at least from 20(1 to IJOO feet, followed 
*Ice Age in North America, pp. 6U. 
