The Whole Extent Of Country Between The Range And
The Coast, Seemed To Be Of Sandstone, Either Horizontally Stratified, Or
Dipping Off The Range; With The Exception Of Some Local Disturbances,
Where Basalt Had Broken Through It.
Those isolated ranges, such as
Coxen's Range - the abruptness of which seemed to indicate igneous
origin - were entirely of sandstone.
The various Porphyries, and Diorites,
and Granitic, and Sienitic rocks, which characterize large districts
along the eastern coast of Australia, were missing; not a pebble, except
of sandstone, was found in the numerous creeks and watercourses. Pieces
of silicified wood were frequent in the bed of the Isaacs.
The nature of the soil was easily distinguished by its vegetation: the
Bastard box, and Poplar gum grew on a stiff clay; the narrow-leaved
Ironbark, the Bloodwood, and the Moreton Bay ash on a lighter sandy soil,
which was frequently rotten and undermined with numerous holes of the
funnel ant. Noble trees of the flooded-gum grew along the banks of the
creeks, and around the hollows, depending rather upon moisture, than upon
the nature of the soil. Fine Casuarinas were occasionally met with along
the creeks; and the forest oak (Casuarina torulosa), together with
rusty-gum, were frequent on the sandy ridges.
One should have expected that the prevailing winds during the day, would
have been from the south-east, corresponding to the south-east trade
winds; but, throughout the whole journey from Moreton Bay to the Isaacs,
I experienced, with but few exceptions, during the day, a cooling breeze
from the north and north-east.
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