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.