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    A squall by the seashore ca 2.3 billion years ago: Raindrop imprints in a Paleoproterozoic tidal flat deposit, Kungarra Formation, Western Australia

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    Authors
    Mazumder, Rajat
    Date
    2015
    Type
    Journal Article
    
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    Citation
    Mazumder, R. 2015. A squall by the seashore ca 2.3 billion years ago: Raindrop imprints in a Paleoproterozoic tidal flat deposit, Kungarra Formation, Western Australia. Australian Journal of Earth Sciences. 62 (3): pp. 265-274.
    Source Title
    Australian Journal of Earth Sciences
    DOI
    10.1080/08120099.2015.1016105
    ISSN
    1440-0952
    School
    Curtin Sarawak
    URI
    http://hdl.handle.net/20.500.11937/25058
    Collection
    • Curtin Research Publications
    Abstract

    In this contribution, we describe the occurrence of well-preserved Paleoproterozoic raindrop impact imprints on two surfaces of rippled siltstone–mudstone from the uppermost part of the Paleoproterozoic Kungarra Formation, Turee Creek Group, Western Australia. The raindrop imprints appear on the tops of two immediately overlying bedding surfaces in siltstone, near the top of a shallowing upward sequence that progresses from sandstone to mudstone. Imprints are circular to elliptical with an average diameter of 2–3 mm and a maximum length of 6.3 mm when elliptical. Flat ripple crest morphologies, varied ripple crest orientations, and marks of standing water in the ripple troughs indicate very shallow water conditions. When combined with sedimentological data from the underlying Kungarra Formation (shallow marine sandstones and siltstones), and mature quartz arenites of the overlying Koolbye Formation (mixed tidal, beach, fluvial and eolian), the interval examined is interpreted as a tidal flat deposited during a falling stage systems tract.

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