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83
Journal of the Royal Society of Western Australia, 102: 83–97, 2019
© Royal Society of Western Australia 2019
Sea level controls on the geomorphic evolution of Geographe Bay, south-
west Australia
GIADA BUFARALE 1*, MICHAEL J O’LEARY 2 & JULIEN BOURGET 2
1 Department of Applied Geology, Curtin University, GPO Box U1987, Perth, WA 6845, Australia
2 School of Earth Sciences, University of Western Australia, Crawley, WA 6009, Australia
* Corresponding author: giada.bufarale@postgrad.curtin.edu.au
Abstract
Keywords: Geographe Bay, Sandbars, Palaeochannels, Low-relief ridges, Sea level oscillations
Manuscript received 6 December 2018; accepted 27 August 2019
INTRODUCTION
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relict siliciclastic grains within the inner shelf are a
such as sea-surface temperature, nutrient availability
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Journal of the Royal Society of Western Australia, 102, 2019
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100 km north of the survey area) by Skene et al
REGIONAL SETTING
Coastal physiography
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Posidonia sinuosa Amphibolis
antarctica
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Coastal Geology and Geomorphology
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marine, with minor shallow-water near-shore marine
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METHODS
Seaoor mapping
through a visual interpretation of the bathymetry,
which areas within the bay to carry out the following
High-resolution shallow-seismic data acquisition
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Sediment sampling and analysis
shaker, over 63 μm, 125 μm, 250 μm, 500 μm, 1 mm
RESULTS
Shallow stratigraphy
Figure 2.
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Seabed features
High-resolution bathymetry highlights three main
Figure 3.
Figure 4.
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Journal of the Royal Society of Western Australia, 102, 2019
which are
Sediment distribution
of biogenic skeletal grains that are highly variable in
Figure 5.
Figure 6.
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STRATIGRAPHIC INTERPRETATION
Figure 7.
Figure 8.
ranges mainly from coarse
represent stations where
line marks the location of the
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Journal of the Royal Society of Western Australia, 102, 2019
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the shallow stratigraphy, up to 50 m below the Australian
Unit B: Leederville Formation
as the
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Unit P: Tamala Limestone
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Unit H: Holocene unit
Figure 9.
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21 locations along southern Western Australia, from
composite Holocene sea-level curve for the Houtman
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of relict siliciclastic grains, with a variable component of
in situ biogenic
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GEOMORPHOLOGICAL FEATURES
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palaeochannels or topographic lows whereas finer
Figure 10.
palaeochannel incisions are
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Sandbars
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Palaeochannels
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Figure 11.
Figure 12.
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bathymetric composite images, are more numerous
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Submerged low-relief ridges
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Figure 13.
Journal of the Royal Society of Western Australia, 102, 2019
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analogous manner, when the sea level was 20–30 m below
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CONCLUSIONS
in situ accumulation
are:
features mostly lie in the south-western portion
Figure 14.
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influencing the geomorphology in the inner
plains, an abrasion surface characterises the top
ACKNOWLEDGEMENTS
Alec Hansen
III
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