On the Palæozoic Radiolarian Rocks of New South Wales

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Abstract
I. I ntroduction . T he discovery of casts of radiolaria in Devonian rocks in New South Wales was made by one of us in 1895.1 I t resulted from a systematic microscopic examination of some of the red jaspers of New South Wales, in the belief' that they were very possibly of deep-sea origin, and therefore likely to contain radiolaria, as was suggested by the field-evidence, as interpreted elsewhere by one of us. At first only chalcedonic casts of radiolaria were observed in the jasper. Early in 1896 one of us (T. W. E. David), when on a visit to England, was shown, through the courtesy of Mr. J. J. H. Teall, F.R.S., a number of carefully-prepared micro-sections of the Ordovician (?) radiolarian cherts from Mullion Island, off the coast of Cornwall, and from the Culm of Devon, as well as from the red jaspers of the Antarctic Continent. A collection of radiolarian rocks was also contributed by Dr. Hinde, chiefly from the Culm of Devon and the Ordovieian (?) of Mullion Island, for comparison with Australian rocks; and this collection subsequently proved of great value in identifying the radiolariau rocks about to be described from New South Wales. Work on these latter was resumed at the University of Sydney during 1896, with the result that the black cherts of Jenolan were found to yield better results than the red jaspers of the New England District of New South Wales. In September of the same year one of us (T. W. E.

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