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Geologic time scale - Wikipedia
https://en.wikipedia.org/wiki/Geologic_time_scale
WEBThe 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). It chronologically organises strata, and subsequently time, by observing fundamental changes in stratigraphy that correspond to major geological or paleontological ...
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Geologic time | Periods, Time Scale, & Facts | Britannica
https://www.britannica.com/science/geologic-time
WEBApr 5, 2024 · The geologic time scale is the “calendar” for events in Earth history. It subdivides all time into named units of abstract time called—in descending order of duration— eons, eras, periods, epochs, and ages. The enumeration of those geologic time units is based on stratigraphy, which is the correlation and classification of rock strata.
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GSA Geologic Time Scale - Geological Society of America
https://www.geosociety.org/GSA/GSA/timescale/home.aspx
WEBGSA Geologic Time Scale. Version 6.0. Updated October 2022. Open PDF. Buy v. 6.0 Poster. Earlier versions: 2018 (v. 5.0) | 2012 (v. 4.0) 2009 (v. 3.0) | 1999 (v. 2.0) 1983 (v. 1.0) Read about the changes to v. 4.0 (2012): Commentary. GSA Bulletin Article (Walker, et …
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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; SEAK, southeast Alaska; NAK, …
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GEOLOGIC TIME SCALE v. 6 - Geological Society of America
https://www.geosociety.org/documents/gsa/timescale/timescl.pdf
WEBGeologic Time Scale v. 6.0 - The Geological Society of America. GEOLOGIC TIME SCALE v. 6.0. MAGNETIC POLARITY. CENOZOIC. PERIOD EPOCH AGE. MAGNETIC MESOZOIC. POLARITY PERIOD EPOCH AGE. PALEOZOIC PRECAMBRIAN. AGE (Ma) C1 QUATER- C2 NARY. 2A C2A. 5 3 C3. 3A C3A. 4 C4 4A. 10 5 C4A. C5. 5A C5A. 15 …
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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 · The geological time scale provides a global summary of countless small-scale temporal correlations of rock layers made at local and regional scales. It is based almost entirely upon careful observations of the distributions of fossils in time and space.
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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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Geologic Time Scale - Major Divisions of Geologic Time Chart
https://geology.com/usgs/geologic-time-scale/
WEBGeologic Time Scale: Divisions of Geologic Time approved by the U.S. Geological Survey Geologic Names Committee, 2010. The chart shows major chronostratigraphic and geochronologic units. It reflects ratified unit names and boundary estimates from the International Commission on Stratigraphy (Ogg, 2009). Map symbols are in parentheses.
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GSA GEOLOGIC TIME SCALE v. 5 - Geological Society of …
https://www.geosociety.org/documents/gsa/timescale/timescl-2018.pdf
WEBgsa geologic time scale v. 5.0 cenozoic age epoch age picks magnetic polarity period hist. chro n. quater-nary pleistocene* miocene oligocene eocene paleocene pliocene piacenzian zanclean messinian tortonian serravallian langhian burdigalian aquitanian chattian rupelian priabonian bartonian lutetian ypresian danian thanetian selandian calabrian ...
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Geologic time scale - Simple English Wikipedia, the free …
https://simple.wikipedia.org/wiki/Geologic_time_scale
WEBGeologic time scale uses the principles and techniques of geology to work out the geological history of the Earth. [1] . It looks at the processes which change the Earth's surface and rocks under the surface.
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