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Triassic environments in the Canning Basin, Western Australia

Created 17/10/2025

Updated 17/10/2025

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A review of the lithology, sedimentary structures and palaeontology, supplemented by original investigations, suggests that the Triassic system in the Canning Basin can be subdivided into four broad environmental episodes. The sequence records a slow transgression culminating in the Smithian, when the riverine plain in the southeastern Fitzroy Graben was drowned. The resulting shallow embayment in the Fitzroy Graben supported a much impoverished marine biota, made up of species tolerant of reduced saline conditions caused by substantial run-off of fresh water from surrounding streams. A regression began in the Spathian and continued throughout the later Triassic, although there were minor transgressions with marine incursions: the environment evolved into a low-relief coastal alluvial plain, with meandering streams and lakes. A general trend to increasing aridity is evident, with an increase red beds, and is correlated with the withdrawal of the Blina Sea. Finally in Ladinian time the region became an area of non-deposition and remained so until the early Jurassic.

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Additional Info

Field Value
Title Triassic environments in the Canning Basin, Western Australia
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/098ae685-834c-4343-96b5-b94b4451e009
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        117.5,
        -21.0
      ],
      [
        129.0,
        -21.0
      ],
      [
        129.0,
        -16.0
      ],
      [
        117.5,
        -16.0
      ],
      [
        117.5,
        -21.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Triassic environments in the Canning Basin, Western Australia". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/triassic-environments-in-the-canning-basin-western-australia