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English: The geologic time scale proportionally represented as a log-spiral. Some key events in Earth's history are marked on the diagram, including major extinction events, global scale glaciations, the initiation of permanent atmospheric oxygen, the formation of the moon, and the formation of Earth's magnetic field.
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.
The geologic time scale or geological time scale (GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating that uses chronostratigraphy (the process of relating strata to time) and geochronology (a scientific branch of geology that aims to determine the age of rocks).
Updated "second Snowball Earths" times and names to be more accurate and better represent the two separate events that occurred in this time. Adjusted start point of "animals" green line to be more accurate with current literate (c. 655 Ma).
Download QR code; Print/export Download as PDF; Printable version; In other projects ... move to sidebar hide. Geologic time scale −4500 — – — – −4000
Geologic timeline can refer to: The geologic time scale of Earth history. The historical development of the science of geology , as in the timeline of geology article.
The colors in the table seem to be taken from the USGS standard, not from the ICS. I personally like the USGS colors, but they are only for large scale geologic maps in the U.S. They are not the international standard. USGS: Divisions of Geologic Time—Major Chronostratigraphic and Geochronologic Units - PDF file
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