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Type: Journal article
Title: Contrasted perceptions of Uluru
Author: Twidale, C.
Bourne, J.
Citation: Physical Geography, 2012; 33(3):285-302
Publisher: V H Winston & Son Inc
Issue Date: 2012
ISSN: 0272-3646
Statement of
C. Rowland Twidale and Jennifer A. Bourne
Abstract: Uluru is an inselberg shaped in arkosic sandstone located in the arid plains of central Australia. The indigenous people believed it rose out of a sand hill and has since remained unchanged. The various minor landforms represented mythological animals, people, and events of the Dreamtime. Later investigators interpreted the residual as remaining after long-distance scarp retreat, or as due to scouring by the wind or by the waters of a huge lake. The inselberg and its decorations have been construed in terms of climatic variations. Uluru also has been interpreted as a compressed and resistant compartment that was exposed as a low rise in the latest Mesozoic. The initial rise shed runoff. The steep flanks were shaped in the Eocene by deep subsurface weathering followed by stripping of the regolith and exposure of bedrock forms. Large tafoni and breaks of slope were formed on the southern side where permeable sediments abutted the residual. Following their exposure, basal flares and footcaves were shaped during a later period of subsurface weathering. The inselberg has grown as a relief feature not by uplift, but by the lowering of the surrounding plains. The morphology of Uluru is an expression of episodic exposure.
Keywords: Inselberg; tectonism; subsurface weathering; episodic exposure; Uluru
Rights: Copyright © 2012 by Bellwether Publishing, Ltd. All rights reserved.
RMID: 0020120755
DOI: 10.2747/0272-3646.33.3.285
Appears in Collections:Geology & Geophysics publications

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