100 
Geology and Physical Geography; 
The surface deposits of the level plains around Sale, in G-ipps- 
land, and those bordering the Murray River, belong to this class, 
and are not ^infrequently to be found almost undistinguishably 
blended with those in actual process of formation. The sand dunes 
and sand rocks of the isthmus between Corner and Shallow Inlets, 
Cape Otway, and other parts of the coast-line, are of Post Ter- 
tiary age, some of them being of comparatively ancient and others 
of quite recent date or even now in process of formation. 
Fig. 45. — Sketch illustrating Stratification of Sand-rock. 
Sand-dunes. 
Red sand layer. 
Red sand layer. 
Middle and Lower 
Tertiary beds. 
Some of these consolidated sand-rocks show remarkable beddings 
due evidently to the fact of their materials having been trans- 
ported and arrauged by the action of wind. At Warrnambool the 
sand-rocks present a regular schistose appearance, with a strong 
dip inland, as though they had been uptilted, but in reality due 
to their having been formed by winds which blew the sand back 
from the coast-line and deposited it in layers sloping at an angle 
of about 30° on the inland slopes. (Fig. 45.) 
Many of the gold drifts are of Post Tertiary age, and consist of 
freshly denuded fragments from the Silurian and other rocks, or 
the re-distributed materials of Tertiary gravels and other forma- 
tions in their neighbourhood that may have been subjected to 
denudation. A few deposits of inferior lignite are associated 
with some of the Post Tertiary clays in creek and river llats. 
