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Geologic time scale - Wikipedia
https://en.m.wikipedia.org/wiki/Geologic_time_scale
WEBThe 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 …
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Geologic time | Periods, Time Scale, & Facts | Britannica
https://www.britannica.com/science/geologic-time
WEBApr 5, 2024 · Geologic time, the extensive interval of time occupied by the geologic history of Earth. Formal geologic time begins with the Archean Eon (4.0 billion to 2.5 billion years ago) and continues to the present day. Modern geologic time scales also include the Hadean Eon (4.6 billion to 4.0 billion years ago).
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Geologic Time Scale - Geology (U.S. National Park Service)
https://www.nps.gov/subjects/geology/time-scale.htm
WEBOct 5, 2021 · Geologic time scale showing the geologic eons, eras, periods, epochs, and associated dates in millions of years ago (MYA). The time scale also shows the onset of major evolutionary and tectonic events affecting the North American continent and the Northern Cordillera (SCAK, south-central Alaska; …
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Geologic Time Scale: A List of Eons, Eras, and Periods - ThoughtCo
https://www.thoughtco.com/geologic-time-scale-eons-eras-periods-1440796
WEBFeb 28, 2020 · Andrew Alden. Updated on February 28, 2020. The geologic time scale is a system used by scientists to describe Earth's history in terms of major geological or paleontological events (such as the formation of a new rock layer or the appearance or demise of certain lifeforms).
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Period | Eras, Epochs & Ages | Britannica
https://www.britannica.com/science/period-geologic-time
WEBPeriod, in geology, the basic unit of the geologic time scale; during these spans of time specific systems of rocks were formed. Originally, the sequential nature of defining periods was a relative one, originating from the superposition of corresponding stratigraphic sequences and the evidence.
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Geological history of Earth - Wikipedia
https://en.m.wikipedia.org/wiki/Geological_history_of_Earth
WEBThe Paleozoic era spanned roughly (Ma) and is subdivided into six geologic periods: from oldest to youngest, they are the Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian.
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11.6: Geologic Time Scale - Geosciences LibreTexts
https://geo.libretexts.org/Courses/Lumen_Learning/Book%3A_Earth_Science_(Lumen)/11%3A_Geologic_History/11.06%3A_Geologic_Time_Scale
WEBScientists have put together the geologic time scale to describe the order and duration of major events on Earth for the last 4 1 ⁄ 2 billion years. Some examples of events listed on the geologic time scale include the first appearance of plant life on Earth, the first appearance of animals on Earth, the formation of Earth’s mountains, and ...
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Geologic Time Scale - Major Divisions of Geologic Time Chart
https://geology.com/usgs/geologic-time-scale/
WEBA geologic time scale is composed of standard stratigraphic divisions based on rock sequences and is calibrated in years (Harland and others, 1982). Over the years, the development of new dating methods and the refinement of previous methods have stimulated revisions to geologic time scales.
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7.4: The Geological Time Scale - Geosciences LibreTexts
https://geo.libretexts.org/Bookshelves/Geology/Historical_Geology_(Bentley_et_al.)/07%3A_Geologic_Time/7.04%3A_The_Geological_Time_Scale
WEBApr 11, 2024 · Just as eons are subdivided into eras, eras are subdivided into units of time called periods. The most well known of all geological periods is the Jurassic period of the Mesozoic era (the movie Jurassic Park, of course, has something to do with that). The Paleozoic era is divided into six periods.
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Explainer: Understanding geologic time - Science News Explores
https://www.snexplores.org/article/explainer-understanding-geologic-time
WEBJune 13, 2019 at 5:30 am. Imagine the nearly unimaginable: 4.6 billion years. That’s how old the Earth is — a mind-boggling length of time. And to measure it, scientists use special terms, most of which focus on the planet’s changing geology. That’s why, in fact, it’s known as geologic time.
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