From Geoscience Australia
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Geological Timescale Bookmark

Created 17/10/2025

Updated 17/10/2025

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A simple geological timescale suitable for printing at A4 size; the one-page version has both sides of the bookmark together. The geological timescale is one of the major achievements of geoscience over the last two centuries. The timescale subdivides the 4.6 billion years since the planet formed into a series of time units (e.g. Jurassic Period). Rocks and particularly the fossils within them have been compared across the world to work out their age relative to each other. This information has been calibrated against an absolute ages of rocks are usually calculated by measuring the natural radioactive decay of minerals. The international standard timescale allows geoscientists to determine the ages of events in Earth history and so understand the evolution of the planet from its formation to the present day. For the most up to date International Chronostratigraphic Chart head to www.stratigraphy.org.

Files and APIs

Tags

Additional Info

Field Value
Title Geological Timescale Bookmark
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/en/dataset/d85ee3fe-c7dd-4fe2-bef9-3e8e37b5c399
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period
Geospatial Coverage Australia
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Geological Timescale Bookmark". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/geological-timescale-bookmark