90 
Geology and Physical Geography: 
quartzites have been found to be clearly antecedent to the Older 
Volcanic rocks, and apparently synchronous with the marine 
Miocene beds, and have on that account been classified as of 
Miocene age. 
The Miocene formations due to fluviatile action are principally 
developed in Gippsland, where there are deposits of sand, gravel, 
and conglomerate capped by older basalt occurring in isolated 
patches, evidently once connected deposits, but now separated 
from ono another by the more deeply eroded river-valleys of the 
Fig. 
Mesozoic. 
37.— Lignite, etc., ix North Branch of Tarwix River. 
Creek bed. 
Older 
Volcanic. - 
present era winch have 
cut through and to a 
great extent removed 
the Older Tertiary drift 
deposits. (Fig. 37 ) 8tmtifled 
uOUlG 01 these lava- clay, and lignite ) 
Soil, clay, and ) 
quartz grovel j 
Lignite 
capped vestiges are 
found at elevations up 
to 5,000 feet above the 
sea, and constitute por- 
tions of the present 
Main Divide. The gra- 
vels, sands, and clays 
covered by Older Vol- 
canic rocks, which occur 
Lignite 
Stiff sand 
Alluvial' 
deposits. 
at the Dargo and Bogong High Plains are the best examples of 
these Miocene patches at high elevations. There arc many other 
smaller outliers, as at the top of 
Mount Useful. Connor’s Plain llG * 
on the Main Divide, between 
the Macalister and Goulburn 
drainage areas, Mount Look- 
out, between the Aberfeldy and 
the Thomson, &c. (Figs. 38 
to 41.) 
Gravels, siliceous and ferru 
giuous conglomerates, clays, 
sands, and impure lignites of 
b b a c 
Silurian, b Older Volcanic, c Siliceous rock. 
Fig. 39. 
Silurian, b Older Volcanic, c Siliceous rocks. 
