Brown hematite, enclosing quartzose sand.
PISONIA ISLAND, on the east of Mornington's Island, is composed of calcareous breccia and pudding-stone, which consist of a sandy calcareous cement, including water-worn portions of reddish ferruginous matter, with fragments of shells.
NORTH ISLAND, one of Sir Edward Pellew's group.

Coarse siliceous sand, concreted by ferruginous matter; which, in some places, is in the state of brown hematite.

Calcareous incrustations, including fragments of madrepores, and of shells, cemented by splintery carbonate of lime.
CAPE-MARIA ISLAND, in Limmen's Bight, was found by Mr.Brown to be composed principally of sandstone.

The specimens from this place, however, consist of grey splintery hornstone, with traces of a slaty structure; and of yellowish-grey flint, approaching to chalcedony; with a coarse variety of cacholong, containing small nests of quartz crystals.
GROOTE EYLANDT is composed of sandstone, of which two different varieties occur among the specimens.

A quartzose reddish sandstone, of moderately fine grain; and a coarse reddish compound, consisting almost exclusively of worn pebbles of quartz, some of which are more than half an inch in diameter, with a few rounded pebbles of chalcedony.