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As such, this table is not to scale and does not accurately represent the relative time-spans of each geochronologic unit. While the Phanerozoic Eon looks longer than the rest, it merely spans ~539 million years (~12% of Earth's history), whilst the previous three eons [note 2] collectively span ~3,461 million years (~76% of Earth's history ...
This is a list of such named time periods as defined in ... Prehistory – Period between the appearance of ... the era generally falls between the years AD 200–600 ...
Basin Groups Era begins on Earth. c. 4,450 Ma – 100 million years after the Moon formed, the first lunar crust, formed of lunar anorthosite, differentiates from lower magmas. The earliest Earth crust probably forms similarly out of similar material. On Earth the pluvial period starts, in which the Earth's crust cools enough to let oceans form.
The Precambrian includes approximately 90% of geologic time. It extends from 4.6 billion years ago to the beginning of the Cambrian Period (about 539 Ma).It includes the first three of the four eons of Earth's prehistory (the Hadean, Archean, and Proterozoic) and precedes the Phanerozoic eon.
The first eon in Earth's history, the Hadean, begins with Earth's formation and is followed by the Archean eon at 3.8 Ga. [2]: 145 The oldest rocks found on Earth date to about 4.0 Ga, and the oldest detrital zircon crystals in rocks to about 4.4 Ga, [34] [35] [36] soon after the formation of Earth's crust and Earth itself.
See calendar and list of calendars for other groupings of years. See history, history by period, and periodization for different organizations of historical events. For earlier time periods, see Timeline of the Big Bang, Geologic time scale, Timeline of evolution, and Logarithmic timeline.
era Archean ICS Plumb, 1991 Mesoproterozoic: 1,600 1,000 era ICS Hofmann, 1987 Mesozoic: 251.0 ± 0.7 65.5 ± 0.3 era ICS middle life: Philips, 1818 Messinian: 7.246 5.332 age Miocene ICS Messina (Italy) Mayer-Eymar, 1867 Miaogoalingian: 422 418.7 age Silurian China Miaolingian: 509 497 Epoch Cambrian ICS Migneintian: 486 478.6 ± 1.7 age ...
This category's scope is limited to human-related history since the end of Earth's most recent glacial period ("the Ice Age") around 10,000 to 15,000 years ago. History portal; See also. List of time periods, which includes periods used in fields such as palaeogeography, palaeoecology, archaeology and cosmology.