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Triassic Basin Biozonation and Stratigraphy Chart No. 20

Created 17/10/2025

Updated 17/10/2025

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Biostratigraphy is the branch of stratigraphy that uses fossils to establish relative ages of rock and correlate successions of sedimentary rocks within and between depositional basins. A biozone is an interval of geologic strata characterised by certain fossil taxa. Such intervals are often defined by the first appearances (range bases), apparent extinctions (range tops/last appearances), or abundances of fossil index species. These key index species should be relatively abundant, short-lived taxa that are easy to recognise and as geographically widespread as possible. Widely used fossil groups include brachiopods, conodonts, dinoflagellate cysts, foraminifera, graptolites, nannofossil, spores and pollen and trilobites. Zonal schemes based on several different fossil groups can be used in parallel, and the zones can be calibrated to the absolute geological timescale using tie points to rocks which have been radio-isotopically dated.

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Additional Info

Field Value
Title Triassic Basin Biozonation and Stratigraphy Chart No. 20
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/en/dataset/787c46bf-0a94-487d-bb59-0bd6216f90f6
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 22/04/2018
Geospatial Coverage Australia
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Triassic Basin Biozonation and Stratigraphy Chart No. 20". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/triassic-basin-biozonation-and-stratigraphy-chart-no-20