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APPENDIX. 
[C. 
bles of a porphyritic rock, which itself contains a consider- 
able proportion of this substance. — And Mr. Greenough has 
recently received, among specimens sent home by Mr. J. 
Burton, junior, a mass of compact epidote, with quartz and 
felspar, from Dokhan, in the desert between the Red Sea and 
the Nile. When New Holland is added to these localities, 
it will appear that few minerals are more widely diffused. 
III. The unpublished sketches, by Captain King and Mr.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 uni- 
form, rectilinear, — the summits flat, and diversified only by 
occasional detached and conical peaks, none of which are 
very lofty. 
IV. 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 
lime-stone is among the specimens from the northern and 
western shores, except that of the recent breccia; and al- 
though negative conclusions are hazardous, it would seem 
probable, from this circumstance, that lime-stone 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. 
