A proposed method of defining deeply weathered rock units based on regional geological mapping in southwest Queensland

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Abstract
A practical system of defining deeply weathered rock horizons is proposed, using the concept of a profile, defined as the vertical extent of a weathered rock sequence from the initiating land surface or originating surface down to unweathered parent rock. Advantages inherent in this system lie in the strict stratigraphic approach, its applicability to field mapping, and its broad accordance with accepted principles and concepts of the Australian Code of Stratigraphic Nomenclature. Establishment of a reference (type) section for each profile, with formal registration by a central authority, together with validation through publication, are recommended. Profile names, which carry some genetic implications, are distinguished from lithostrati‐graphic units through the use of distinctive map symbols and inclusion of the word profile within profile names. Three weathered rock units (Morney profile, Canaway profile and Curalle silcrete profile), and one altered rock unit (Haddon silcrete) which is believed to be a product of subsurface silicification, are formally defined. Parent rocks of these profiles (Winton and Eyre Formations) are described to demonstrate the nature of weathering and substantiate the recognition of a particular profile. Combinations of parent rock and weathered profile relationships are given to explain regional continuity of these profiles throughout southwest Queensland.

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