The age and geomorphic correlations of deep‐weathering profiles, silcrete, and basalt in the Roma‐Amby region, Queensland

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Abstract
A deep‐weathering profile is developed in the Mesozoic sedimentary rocks of the Roma‐Amby region, where it forms a capping to dissected tablelands. The profile consists of up to 25m of mottled and leached sediments, rarely in well‐defined zones; crust in place with respect to the profile is seldom preserved. Tholeiitic basalts and olivine basalts with possible alkaline affinities were erupted along the axis of the Merivale Syncline in the Amby‐Mt Hutton area; K‐Ar dates indicate that they are about 23 m.y. old. The basalts were extruded after the period of deep‐weathering, which occurred therefore in or before Early Miocene. The abundant silcrete in the area has formed at various times during the Cainozoic and is not necessarily related to the deep‐weathering.

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