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Depositional and halokinetic-sequence stratigraphy of the Neoproterozoic Wonoka Formation adjacent to Patawarta allochthonous salt sheet, Central Flinders Ranges, South Australia

By
Rachelle A. Kernen
Rachelle A. Kernen
Department of Geological Sciences, New Mexico State University, P.O. Box 30001, Las Cruces, NM 88003, USA
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Katherine A. Giles
Katherine A. Giles
Department of Geological Sciences, New Mexico State University, P.O. Box 30001, Las Cruces, NM 88003, USA
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Mark G. Rowan
Mark G. Rowan
Rowan Consulting, Inc., 850 8th St, Boulder, CO 80302, USA
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Timothy F. Lawton
Timothy F. Lawton
Department of Geological Sciences, New Mexico State University, P.O. Box 30001, Las Cruces, NM 88003, USA
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Thomas E. Hearon
Thomas E. Hearon
Department of Geology and Geological Engineering, Colorado School of Mines, 1516 Illinois St, Golden, CO 80401, USA
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Published:
January 01, 2012

Abstract

Parts of two third-order Neoproterozoic (Marinoan) depositional sequences are documented in the Wilpena Group (Wonoka Formation and Bonney Sandstone) at Patawarta diapir, located in the central Flinders Ranges, South Australia. These sequences represent an overall regressive succession transitioning upwards from outer to middle wave-dominated shelf deposits to a tidally dominated barrier bar to coastal plain. The lower, middle, upper limestone and green mudstone informal members of the Wonoka Formation comprise the Highstand Systems Tract of the lower sequence. The Sequence Boundary is at the top of the Wonoka green mudstone member and is overlain by the Lowstand Systems Tract of the upper sequence, which includes the lower dolomite, sandstone and upper dolomite beds of the Patsy Hill Member of the Bonney Sandstone. The upper sequence Transgressive Systems Tract comprises the Bonney Sandstone. These units comprise one complete tapered composite halokinetic sequence (CHS). The lower halokinetic-sequence boundary is associated with the Maximum Flooding Surface of the lower depositional sequence and the upper halokinetic-sequence boundary is interpreted as the Transgressive Surface of the overlying depositional sequence where an angular truncation of up to 90° is documented.

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Contents

Geological Society, London, Special Publications

Salt Tectonics, Sediments and Prospectivity

G. I. Alsop
G. I. Alsop
University of Aberdeen, UK
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S. G. Archer
S. G. Archer
University of Aberdeen, UK
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A. J. Hartley
A. J. Hartley
University of Aberdeen, UK
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N. T. Grant
N. T. Grant
ConocoPhillips UK Ltd, Aberdeen, UK
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R. Hodgkinson
R. Hodgkinson
Bowleven plc, Edinburgh, UK
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Geological Society of London
Volume
363
ISBN electronic:
9781862396111
Publication date:
January 01, 2012

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