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The geologic time scale, proportionally represented as a log-spiral with some major events in Earth's history. A megaannus (Ma) represents one million (10 6) years.. The geologic time scale or geological time scale (GTS) is a representation of time based on the rock record of Earth.
The following five timelines show the geologic time scale to scale. The first shows the entire time from the formation of the Earth to the present, but this gives little space for the most recent eon. The second timeline shows an expanded view of the most recent eon.
Geologic time is the timescale used to calculate dates in the planet's geologic history from its origin (currently estimated to have been some 4,600 million years ago) to the present day. Radiometric dating measures the steady decay of radioactive elements in an object to determine its age. It is used to calculate dates for the older part of ...
Geologic time shown in a diagram called a geological clock, showing the relative lengths of the eons of Earth's history and noting major events The geological history of the Earth follows the major geological events in Earth's past based on the geological time scale , a system of chronological measurement based on the study of the planet's rock ...
- moon/lunar (Lunar geologic timeline) - mars/martian (Martian geologic timeline) - long fossil/long/all time (complete timeline of earth's history) (NOTE: Upper/lower case does not matter for these values.) earliest Adds a translucent green bar to the solid green bar of the horizontal timeline, extending to the earliest possible timeframe the ...
Detailed logarithmic timeline – Timeline of the universe, Earth, and mankind; Earth phase – Phases of the Earth as seen from the Moon; Evolutionary history of life; Future of Earth – Long-term extrapolated geological and biological changes of planet Earth; Geological history of Earth – The sequence of major geological events in Earth's past
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