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Middle Ordovician Conodonts and Fish from the Stairway Sandstone, Amadeus basin

Created 20/01/2026

Updated 20/01/2026

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The Middle Ordovician Stairway Sandstone consists of a succession of siliciclastic shallow marine sediments, stratigraphically positioned between the dark organic-rich siltstones of the Horn Valley Siltstone, and the regressive siltstones and shales of the overlying Stokes Siltstone, in the Amadeus Basin. The Stairway Sandstone is notable for containing early arandaspid fish fossils, and is a prospective reservoir for Larapinta Petroleum System hydrocarbons. The unit has not been directly dated, but a field sample from the uppermost Stairway Sandstone has yielded an abundant and well-preserved fauna, including micro-vertebrate and conodont fossils that enable correlation to high resolution international conodont biozonation schemes.

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Title Middle Ordovician Conodonts and Fish from the Stairway Sandstone, Amadeus basin
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/b10a5e7e-187a-44c8-8ccb-9ec777baf6a6
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 11/11/2025
Geospatial Coverage
Map data © OpenStreetMap contributors
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Data Portal Data.gov.au