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The latter two are sub-divided into several eras as currently defined. In total, the Precambrian comprises some 85% of geological time from the formation of Earth to the time when creatures first developed exoskeletons (i.e., hard outer parts) and thereby left abundant fossil remains.
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).
These can be divided broadly into prehistorical periods and historical periods (when written records began to be kept). In archaeology and anthropology , prehistory is subdivided into the three-age system , this list includes the use of the three-age system as well as a number of various designation used in reference to sub-ages within the ...
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 ...
It consists of three eras: The Paleozoic, Mesozoic, and Cenozoic, [105] and is the time when multi-cellular life greatly diversified into almost all the organisms known today. [147] The Paleozoic ("old life") era was the first and longest era of the Phanerozoic eon, lasting from 538.8 to 251.9 Ma. [105]
1912 – Alfred Wegener proposes that all the continents once formed a single landmass called Pangaea that broke apart via continental drift; 1912 – George Barrow maps zones of metamorphism (the Barrovian sequence) in southern Scotland; 1913 – Albert A. Michelson measures tides in the solid body of the Earth