The unpublished sketches, by Captain King and Mr.Roe, of the hills in sight during the progress of the survey of the Coasts of Australia, accord in a very striking manner with the geological character of the shore.

Those from the east coast, where the rocks are primitive, representing strongly marked and irregular outlines of lofty mountains, and frequently, in the nearer ground, masses of strata highly inclined.
The outlines on the contrary, on the north, north-west, and western shores, are most commonly uniform, rectilinear, the summits flat, and diversified only by occasional detached and conical peaks, none of which are very lofty.
4.

No information has yet been obtained, from any of the collections, respecting the diluvial deposits of Australia: a class of phenomena which is of the highest interest, in an island of such vast extent, so very remote in situation, and of which the existing animals are so different from those of other parts of the globe.

It is remarkable, also, that no limestone is among the specimens from the northern and western shores, except that of the recent breccia; and although negative conclusions are hazardous, it would seem probable, from this circumstance, that limestone cannot be very abundant or conspicuous at the places visited.

No eruptive mountains, nor any traces of recent volcanic eruption, have yet been observed in any part of Australia.
5.