Beach and coastal dune systems of Two Peoples Bay Nature Reserve, Western Australia

Hesp, Patrick A.

doi:10.1071/pc24080

Pacific Conserv. Biol.

2024

DOI: 10.1071/pc24080

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Beach and coastal dune systems of Two Peoples Bay Nature Reserve, Western Australia

Patrick A. Hesp

Abstract: Context This paper is one of a series on the natural history of Two Peoples Bay Nature Reserve in Western Australia. Methods The geomorphology of the beach and coastal dune systems of Two Peoples Bay Nature Reserve are mapped and the landform units comprising the beach and dune systems are described. Key results An overview of the Two Peoples Bay–Nanarup beach-dune system comprising the Two Peoples Nature Reserve is provided. Conclusions The evolutionary patterns of the major dune forms are… Show more

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2024

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Cited by 2 publications

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Geology and landforms of Two Peoples Bay Nature Reserve, Western Australia

Tyler,

Playford,

Evans

2024

Pacific Conserv. Biol.

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Context Underlying geology strongly influences landforms, soil composition, and hydrogeology in Two Peoples Bay Nature Reserve, Western Australia, which was mapped by P. E. Playford in 1982. Aims To review the mapping of the Reserve, with the aim to better understand the geological history and landforms of the area. Methods In 2024, I. M. Tyler and K. A. Evans reviewed P. E. Playford’s mapping in the field, viewed aerial photography and geophysical imagery, and reviewed research published since 1984. Key results The oldest rocks are 1290 Ma granitic gneiss and an 1180 Ma granite intrusion. Amalgamation of the Meso- to Neoproterozoic Rodinian Supercontinent put the Albany−Fraser Orogen at the heart of east Gondwana for ~1.0 billion years. At 165 Ma, that plate configuration began to break up, and from 83 Ma, the Eucla Basin opened. Cenozoic landforms and surficial deposits record northward plate movement and collision with south-east Asia at around 23 Ma, causing tectonic uplift, sea-level change, and climate change. The middle to upper Eocene Plantagenet Group was deposited in a shallow marine embayment with Maardjitup Gurlin/Mount Gardner, forming an island. The uplifted Eocene sea floor was lateritized in the Miocene and is presently covered by Holocene eolian sand dunes, peaty swamps and lakes. Maardjitup Gurlin/Mount Gardner was connected to the mainland by Pleistocene eolianite deposits. Conclusions The influence of plate tectonics on the geological evolution of an area is profound, from the origin and composition of the oldest rocks to the present landscape and the youngest surficial deposits. Implications Understanding the geological history of an area is essential to understanding landscape evolution and the natural history of the flora and fauna that inhabit it.

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Geology and landforms of Two Peoples Bay Nature Reserve, Western Australia

Tyler,

Playford,

Evans

2024

Pacific Conserv. Biol.

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Landforms and soils of Two Peoples Bay Nature Reserve, Western Australia

McArthur,

Bartle,

Evans

et al. 2024

Pacific Conserv. Biol.

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Context This paper is one of a series on the natural history of Two Peoples Bay Nature Reserve on the south coast of Western Australia. Methods Landforms and soils of the Reserve were mapped by W. M. McArthur and G. A. Bartle in the mid- to late 1980s with some verification by K. A. Evans in 2023–2024. Key results A map of the landforms and soils of the Reserve is presented. The complex and variable topography and soils have arisen through a combination of in-situ weathering processes, transportation of dune sands, and lacustrine deposition. Conclusions The topography and soils of the Two Peoples Bay Nature Reserve are complex and variable. Implications The distribution of the landforms and soils of the Reserve can be explained by the geological and geomorphological framework described in the paper.

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Beach and coastal dune systems of Two Peoples Bay Nature Reserve, Western Australia

Cited by 2 publications

References 16 publications

Geology and landforms of Two Peoples Bay Nature Reserve, Western Australia

Geology and landforms of Two Peoples Bay Nature Reserve, Western Australia

Landforms and soils of Two Peoples Bay Nature Reserve, Western Australia

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