...Brown found the stone of this ridge of craggy mountains to be argillaceous, similar to that of the flat-topped land where I had taken bearings on the west side of the inlet...
Matthew Flinders 「A Voyage to Terra Australis」
...In Oyster Harbour a rather strongly impregnated ironstone prevails, but mixed with quartz and granite; and in some parts of both harbours a brown argillaceous earth was not uncommon...
Matthew Flinders 「A Voyage to Terra Australis」
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