Abstract

The Leichhardt-Gilbert area of northwest Queensland comprises four physiographic divisions, the Isa Highlands in the west, the Carpentaria and Inland plains in the center, and the Einasleigh Uplands in the east. A plain of erosion of late Tertiary-Quaternary age occupies large areas of the central plains, and remnants of erosional plains of early to middle Tertiary and pre-middle Mesozoic ages are prominent elements of the present land surface in the two upland areas. The three plains are considered to be subaerial and polycyclic in origin; a geologically recent emergence has caused renewed downcutting near the coast.

Except where the lithology is conducive in certain localities on the youngest plain of erosion no evidence suggests that pediplanation is or has been the dominant process molding the landscape. However, the writer agrees with the theses of L. C. King that in the Leichhardt-Gilbert area there are three major surfaces of erosion and that laterization occurred earlier than previously postulated.

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