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68 as occurring in places, as far south as Arrowsmith River. He likewise mentions the red sandstone about Gantheaume Bay as lying horizontally under the white sandy limestone. All these observations go to strengthen my idea of this red sandstone being the lower part of the tertiary formation.

VI. NORTH-WEST COAST.

Of the coast from Sharks Bay round the N. W. Cape to Dampier's Archipelago, I can find no published account which contains much geological information. Captain Stokes describes the coast from N. W. Cape to the rocky promontory near Regent's River as a dead flat of sand. In the Dampier Archipelago, Malus Island is said in Dr. Fitton's Appendix to Captain King's voyage, to consist of greenstone. Depuch Island is likewise said to be basaltic, or volcanic, in the same voyage, on the authority of M. Peron, p. 147. But in Captain Stokes' voyage, both Depuch Island and the neighbourhood, is said to be formed of a coarse gritty yellow sandstone, much honeycombed, p. 168. Captain Stokes also describes Barrow's Island as consisting of red sandstone. The probabilities perhaps are in favour of the rocks of the hill country of Western Australia striking out to the N. W. Cape, partly fronted and covered by the tertiary rocks.

From the neighbourhood of Dampier's Archipelago to Roebuck Bay, it appears from the accounts of