222 WALTER HOWCHIN 
a height above the Linda Creek of 320 feet. It is a typical glacial 
till. The included bowlders consist mainly of quartzites derived 
from the conglomerates that form the summits of Mount Owen 
and Mount Lyell. Some of the erratics in the till have come from 
a greater distance, as, for example, diabases, which belong to the 
mountain ranges and central plateau farther to the east. 
The West Coast Railway passes through much of the glacial 
country, in its lower altitudes, and has numerous cuttings inter- 
secting moraines. ‘This is especially seen in that part of the line 
situated between Farrell and Zeehan. Some of the erratics at 
Farrel are of great size. One of Devonian Conglomerate, brought 
down by the ice from near the crest of the Ranges, measures 25 
feet in greatest diameter. Gregory obtained from the till several 
distinctly glaciated bowlders. 
As in the case of the Kosciusko glaciation of the mainland, the 
age of this recent glaciation of Tasmania is largely a matter of 
inference based on the physiographical changes that have tran- 
spired in the interval. In its main outlines Tasmania was, at 
that period, very much the same as it is today. From the direction 
of ice-flow, as well as the nature of the transported material, it is 
certain that the principal gathering fields were on the Central 
Plateau, the Eldon Range, and other heights to the east of the 
country examined and described. The freshness of the glaciated 
surfaces and the position, as well as the condition, of the valley 
moraines all point to a relatively recent glaciation, certainly not 
older than the Pleistocene. 
Tasmania, in common with most of Southern Australia, has 
undergone considerable oscillations of level within recent periods. 
The drowned valleys of the Tamar, the Derwent, and Macquarie 
Harbor, as well as Bass Strait, are proofs of subsidence. On the 
other hand there are evidences of recent uplift. Moore’s estimate 
that the ice in the King River Valley came down to within about 
4oo feet of sea level agrees with that of Gregory’s in relation to 
the Pieman Valley. Gregory says: 
The bowlder clays of the Pieman Valley give the lowest level (400 feet 
above the sea) yet proved for the Tasmanian Pleistocene glaciers. It must 
be remembered, however, that there is certain evidence of a recent uplift of 
