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A new nannofossil zone based on the Santonian Gingin Chalk, Perth Basin, Western Australia

Created 16/10/2025

Updated 16/10/2025

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Studies of the Gingin Chalk have indicated that it is Santonian in age; these studies did not deal with calcareous nannofossils. Santonian biostratigraphy in terms of nannofossils is problematic. The relative ranges of several Upper Cretaceous key nannofossil species, particularly those of the Santonian, are controversial. Precise determination of these ranges hinges on suitable illustration of the species using optical microscopy for successful subsequent identifications. Light microscopic illustrations of most of the nannofossil species recovered from the Gingin Chalk are presented. Based on several species among the Gingin Chalk assemblages a new Santonian zone, the Lucianophabdus maleformis Zone, is proposed. Thus, on the basis of sequential earliest occurrences of several key species, the late Coniacian-early Campanian interval can be subdivided into: the Marthasterites furcatus, Lucianorhabdus maleformis, and Broinsonia parca Zones.

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Title A new nannofossil zone based on the Santonian Gingin Chalk, Perth Basin, Western Australia
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/9f4d63b2-03f3-44e1-aaed-e43dc1c07640
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        115.85,
        -31.4
      ],
      [
        115.95,
        -31.4
      ],
      [
        115.95,
        -31.25
      ],
      [
        115.85,
        -31.25
      ],
      [
        115.85,
        -31.4
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "A new nannofossil zone based on the Santonian Gingin Chalk, Perth 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/a-new-nannofossil-zone-based-on-the-santonian-gingin-chalk-perth-basin-western-australia