Chloritic mudstones are the dominant rock in the Parry group, which conformably overlies the Tamworth group in the sequence of upper Devonian-lower Carboniferous beds deposited in the Tamworth trough. Lithic labile graywackes and sandstones, feldspathic graywackes, argillaceous and lithographic limestone, and polymictic conglomerate are also present. Detritus is thought to have been derived from an andesitic island are with local exposures of older sediments, granite, and acid volcanics. The modal composition of the rocks shows a restricted range, suggesting that the composition of the source area did not change during deposition of the sequence.

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