The western extremity of BATHURST ISLAND, between CAPE HELVETIUS and CAPE FOURCROY, is also formed of cliffs of a very dark red colour.
LACROSSE ISLAND, at the mouth of CAMBRIDGE GULF, about one hundred miles from Port Keats.

Reddish, very quartzose sandstone; from a stratum which dips to the south-east, at an angle of about ten or fifteen degrees.
Micaceous and argillaceous fissile sandstone, of purplish and greenish hues, in patches, or occasionally intermixed; precisely resembling the rock of Brecon, in South Wales, and, generally, the old red sandstone of the vicinity of Bristol and the confines of England and Wales.
Fine-grained thin-slaty sandstone, resembling certain beds of the coal formation, or of the millstone grit, is found in large masses, under an argillaceous cliff, on the north side of Lacrosse Island.
The specimens from the interior of Cambridge Gulf are from ADOLPHUS ISLAND, and consist of reddish and grey sandstone, more or less decomposed.
VANSITTART BAY, about one hundred and forty miles north-west of Cambridge Gulf.

Reddish quartzose sandstone, or quartz-rock.

Indistinct specimens of greenstone, with adhering quartz; apparently a primitive rock.
PORT WARRENDER, at the bottom of Admiralty Gulf, about forty miles south-west of Vansittart Bay (Narrative volume 1).

Epidote and quartz, in small crystals confusedly interlaced; apparently from veins, or nests, but unaccompanied by any portion of the adjacent rock.