Geology.] 
NATURAL HISTORV. 
613 
Astell’s Island, north-east of Inglis’s Isle, Very fine- 
grained greyish-white quartzose sandstone ; — identical with 
that of Mallison’s Island, and very closely resembling some 
of the specimens from Prince Regent’s and Hunter’s Rivers. 
Among the remaining islands of this range, — Bosanquet’s, 
Cotton’s, and Pobassoo’s Isles, were found by Mr. Brown 
to consist, in a great measure, of sand-stone, of the same 
character with the specimens above-mentioned. 
Pobassoo’s Island, a small islet south-east of Astell’s 
Isle. — Fine-grained, somewhat reddish, sand-stone. Another 
specimen of sand-stone is friable, of a light flesh-red co- 
lour, and apparently composed of the debris of granite. A 
crystalline rock, consisting of greenish-grey hornblende, 
with a very small proportion of felspar {Hornblende rockl '). — 
Fragment, apparently from^a columnar mass, of a stone 
intermediate between clink-stone and compact felspar. 
Such of the English Company’s Islands as were ex- 
amined by Captain Flinders, are stated by him to consist, in 
the upper part, of a grit, or sand-stone, of a close texture ; 
the lower part being argillaceous, and stratified, and ‘ sepa- 
rating into pieces of a reddish colour, resembling flat tiles.’ 
The strata-dip to the west, at an angle of about 15°. 
South-west bay of Goulburn’s south Island, two hun- 
dred and fifty miles west of the Gulf of Carpentaria, (Nar- 
rative, i. p. 64.) — Coarse-grained reddish quartzose cow- 
glomerate and sand- stone ; resembling the older sand-stones 
of England and Wales, and especially the “ mill-stone grit” 
beneath the coal formation. Fine greyish-white pipe- clay ; 
of which about thirty feet in thickness were visible, ap- 
parently above the sand-stone last mentioned. Coarse- 
grained, ferruginous sand-stone, containing fragments of 
