AUSTRALIAN GLACIATIONS 203 
the height of the morainic material within the valley, gives a 
thickness of not less than 1,500 to 1,600 feet for the deposit. 
Fic. 4.—Polished, grooved, and striated pavement, too yards in length, covered 
by 9 feet of bowlder clay that contains erratics up to several feet in diameter. Exposed 
by a recent washout that cuts through the till down to the glaciated floor. The pave- 
ment is also seen in adjacent washouts proving the glaciated area to be over an acre 
in extent. Inman Valley, S. Aus. W. Howchin, photo. 
The Inman Valley is bordered on either side by ranges of Cam- 
brian and pre-Cambrian rocks, which form upland plateaus from 
1,000 to 1,800 feet high. While glacial evidences are not absent 
