The cliffs of this island are
composed of a fissile primitive rock, on which sandstone reposes in
regular beds. The specimen of the former resembles gneiss, or mica slate,
near the contact with granite: the sandstone is thick-slaty, quartzose,
of a reddish hue, with mica disseminated on the surfaces of the joints;
and one face of the specimen is incrusted with quartz crystals, thinly
coated with botryoidal hematite. Light grey quartzose sandstone of a fine
grain, with a thin coating of brown hematite, was also found in this
island: And a breccia, consisting of angular fragments of sandstone,
cemented by thin, vein-like, coatings of dark brown hematite, was found
there, in loose blocks at the bottom of perpendicular cliffs. The
specimen of this breccia is attached to a plate of granular quartz, and
may possibly have been part of a vein.

The shore of INGLIS' ISLAND, the largest of the ENGLISH COMPANY'S RANGE
(2. 2. 2. in the Map) is formed of flat beds, of a slaty argillaceous
rock, which breaks into rhomboidal fragments; but the specimen is
indistinct. Ferruginous masses, probably consisting of brown hematite,
come also from this island.

ASTELL'S ISLAND, north-east of Inglis' 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 sandstone, 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, sandstone. Another specimen of sandstone
is friable, of a light flesh-red colour, and apparently composed of the
debris of granite. A crystalline rock, consisting of greenish-grey
hornblende, with a very small proportion of felspar (Hornblende rock ?).
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 examined by Captain
Flinders, are stated by him to consist, in the upper part, of a grit, or
sandstone, of a close texture; the lower part being argillaceous, and
stratified, and separating into pieces of a reddish colour, resembling
flat tiles. The strata-dip to the west, at an angle of about 15 degrees.

South-west bay of GOULBURN'S SOUTH ISLAN