Such intervals are often defined by the first appearances (range bases), apparent extinctions (range tops/last appearances), or abundances of fossil index species. A biozone is an interval of geologic strata characterised by certain fossil taxa. What is biostratigraphy?īiostratigraphy 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. The Timescales project team also provides biostratigraphic expertise to other Geoscience Australia projects to help with detailed age and palaeoenvironmental assessments. It places particular emphasis on those parts of the stratigraphic column where economic resources are important. The Timescales project within Geoscience Australia maintains and develops geological timescales and fossil biozonations.
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