From a study of the association of flint clays and thick, lateritic palaeosols developed on Early Permian basalts at a depth of more than 1,200 m in the Quirindi Bore, it is concluded that during at least part of the Artinskian Stage in the Sydney Basin the climate was humid and tropical to subtropical. The concept however, is at variance with the popular belief that in accordance with other Gondwana countries, alternations of frigid and cold temperate conditions prevailed in Australia during the Early Permian and may have persisted through to the close of the period.

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