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2. Geologic time scale - Wikipedia

   en.wikipedia.org/wiki/Geologic_time_scale

   Principles. The geologic time scale is a way of representing deep time based on events that have occurred throughout Earth's history, a time span of about 4.54 ± 0.05 Ga (4.54 billion years). [5] It chronologically organises strata, and subsequently time, by observing fundamental changes in stratigraphy that correspond to major geological or ...

3. Geological history of Earth - Wikipedia

   en.wikipedia.org/wiki/Geological_history_of_Earth

   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 layers (stratigraphy). Earth formed about 4.54 billion years ago by accretion from the solar nebula, a disk-shaped mass of dust and gas left ...

4. Timeline of natural history - Wikipedia

   en.wikipedia.org/wiki/Timeline_of_natural_history

   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 ...

5. History of Earth - Wikipedia

   en.wikipedia.org/wiki/History_of_Earth

   The history of Earth is divided into four great eons, starting 4,540 mya with the formation of the planet. Each eon saw the most significant changes in Earth's composition, climate and life. Each eon is subsequently divided into eras, which in turn are divided into periods, which are further divided into epochs. Eon.

6. List of free geology software - Wikipedia

   en.wikipedia.org/wiki/List_of_free_geology_software

   Java. Free to use software to digitize geological cross-sections, and display and edit borehole logs. Geoscience ANALYST [31] Free 3D visualization and communication software for integrated, multi-disciplinary geoscience and mining data and models, which also connects to Python through geoh5py, its open-source API.

7. Template:Timeline geological timescale - Wikipedia

   en.wikipedia.org/wiki/Template:Timeline...

   Timeline geological timescale. 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. In a similar way, the most recent era is ...