The island is surrounded by a coral bank; its north side is formed by a perpendicular argillaceous cliff of a bright yellow colour, and is a conspicuous object to vessels entering the bay.

The road, having been cut in the side of the cliff, exposed layers of brown argillaceous schist, like rotten wood, and so friable that it crumbled between the fingers; but what was more remarkable was that the layers, scarcely thicker than slate, instead of being on their natural plane, were turned up quite vertically.

The surface of the land was thrown or washed up into dark-brown hillocks of broken argillaceous schist, which repelled vegetation, but the hollows were wooded with mountain oak and many shrubs.

The taste and science displayed in its execution do credit to the engineer; and the soil in which it is imbedded, being argillaceous, partially encrusted with strontian, reflects equal honour on his geological attainments.

The coal measures of Commentry, as well as certain others, such as those of Bezenet, Swansea, etc., contain quite a large quantity of coal gravel in sandstone or argillaceous rocks.

The soil of the Mamelles, like almost all that of the middle of the Peninsula, which appears to lie upon argillaceous lava, in a state of decomposition, is much better.

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.

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.

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 cliffs at Foul Point and Point Cunningham unite the sandstone and argillaceous formation.)