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2. Geologic time scale - Wikipedia

   en.m.wikipedia.org/wiki/Geologic_time_scale

   The geologic time scale is a representation of time based on the rock record of Earth. It uses chronostratigraphy and geochronology to define divisions of geologic history, from the oldest Eoarchaean to the present Anthropocene.

3. GSA Geologic Time Scale - Geological Society of America

   www.geosociety.org/GSA/GSA/timescale/home.aspx

   The Geological Society of America (GSA) provides the latest version of the geologic time scale, a tool for understanding the history of Earth and life. Download the PDF or buy the poster of the GSA Geologic Time Scale, updated in 2022.

4. Geologic time | Periods, Time Scale, & Facts | Britannica

   www.britannica.com/science/geologic-time

   Geologic time is the interval of time occupied by the geologic history of Earth, recorded in the rock strata and fossils. Learn about the geologic time scale, its units, and how it is based on stratigraphy and radiometric dating.

5. Geologic Time Scale - Geology (U.S. National Park Service)

   www.nps.gov/subjects/geology/time-scale.htm

   Learn how geologists measure and organize geologic time using major events and life-forms as markers. Explore the graphic and text versions of the geologic time scale and its subdivisions.

6. Geologic Time Scale - Major Divisions of Geologic Time Chart

   geology.com/usgs/geologic-time-scale

   Learn about the standard stratigraphic divisions of geologic time based on rock sequences and calibrated in years. See the latest updates and changes to the time scale, including the Quaternary and Holocene boundaries, and the Ediacaran System.

7. GEOLOGIC TIME SCALE v. 6 - Geological Society of America

   www.geosociety.org/documents/gsa/timescale/timescl.pdf

   A PDF document that shows the geologic time scale from the present to the Precambrian, with magnetic polarities, periods, epochs, and ages. It also includes the names and dates of the major biostratigraphic events and the global boundary stratotype sections and points.

8. 11.6: Geologic Time Scale - Geosciences LibreTexts

   geo.libretexts.org/Courses/Lumen_Learning/Book:_Earth...

   Learn how geologists measure and interpret the history of Earth using the geologic time scale. Explore the major events and eras of Earth's past and present, from the Archean Eon to the present day.

9. Geologic Time Scale : Divisions, Periods and Eons - Geology...

   geologyscience.com/.../paleontology/geologic-time-scale

   Learn how geologists use the Geologic Time Scale to describe and organize the history of the Earth and its life forms. The Geologic Time Scale is divided into eons, eras, periods, and epochs, each with specific events and changes.

10. ics-chart - International Commission on Stratigraphy

    stratigraphy.org/timescale

    Explore the International Chronostratigraphic Chart, a visual representation of the geological time scale based on the Semantic Web. Zoom in and out, change the time scaling, and see the names and ages of the eons, eras, periods, and stages.

11. The Geological Society of America Geologic Time Scale

    www.geosociety.org/documents/gsa/timescale/Walker-et-al...

    A review of the history and development of the geologic time scale, based on numerical and relative ages of rocks and events. The paper covers the main components of the time scale, such as chronostratigraphy, geochronology, astrochronology, and chemostratigraphy.