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  • Geologic time scale - Wikipedia
    The following five timelines show the geologic time scale to scale The first shows the entire time from the formation of Earth to the present, but this gives little space for the most recent eon
  • Geologic time | Periods, Time Scale, Facts | Britannica
    The geologic time scale is the “calendar” for events in Earth history It subdivides all time into named units of abstract time called—in descending order of duration— eons, eras, periods, epochs, and ages
  • Geologic Time Scale - Geology (U. S. National Park Service)
    Geologic time scale showing the geologic eons, eras, periods, epochs, and associated dates in millions of years ago (MYA)
  • Geologic Time Scale - Science Notes and Projects
    Learn about the geologic time scale or GTS Discover what it is, how it is divided, and the characteristics of each time period
  • Geological timechart - British Geological Survey
    The BGS geological timechart provides colourful reference material for use in schools, colleges and at home, setting out the geological timescale and geochronological terms we use at BGS You can browse the timechart by geological era in the page below or download the Phanerozoic Timechart as a pdf
  • GSA Geologic Time Scale
    At GSA you'll find the resources, confidence, and connections you need to reach fulfilling new heights in your geoscience career
  • Geologic Time Scale - Geology Science
    The answer is the geologic time scale, a system that divides Earth’s history into eons, eras, periods, and epochs It’s the timeline that connects rocks to time — and time to life
  • Geologic Time Scale | U. S. Geological Survey - USGS. gov
    The Geologic Time Scale above is a helpful reference to use along with the information provided below The left half shows a timeline of Earth’s geologic history which is split into Eons, Eras, Periods, and Epochs and how many millions of years ago (MYA) these occurred
  • Geologic Time Scale - Geological Time Line
    Geologists have divided Earth's history into a series of time intervals These time intervals are not equal in length like the hours in a day Instead the time intervals are variable in length This is because geologic time is divided using significant events in the history of the Earth
  • Geologic Time Scale: Eons, Eras, Periods and Epochs
    The Geologic Time Scale is divided into four eons, ten eras, 22 periods, and several epochs and ages Each eon, era, period, and epoch is defined by major geological or paleontological events





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