Summary
The ignimbrites at Tatong are of interest for the following reasons:
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1.
In view of their antiquity (most previously described ignimbrites being Tertiary to Recent in age).
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2.
They represent the largest development of ignimbrites so far described or suspected from the Upper Devonian volcanic rocks of Victoria. (Only one other suspected occurence has been mentioned in the literature).
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3.
The excellent state of preservation of primary textural features indicating a nuée ardente origin in old rocks which have suffered some folding and possible mild thermal metamorphism.
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4.
An important textural feature of the rocks which the author believes supports the interpretation that they are ignimbrites (the distribution of fractured and unbroken phenocrysts between flattened lava fragments and the finer « matrix » of the rocks) has apparently not been noted in previously described examples.
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5.
The fairly restricted areal distribution combined with large total thickness is unusual for ignimbrites and implies fairly special conditions accompanying their extrusion.
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Brown, M.C. Some ignimbrites of Upper Devonian age from Victoria, Australia. Bull Volcanol 24, 429–442 (1962). https://doi.org/10.1007/BF02599359
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DOI: https://doi.org/10.1007/BF02599359