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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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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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GSA Geologic Time Scale - Geological Society of America
https://www.geosociety.org/GSA/GSA/timescale/home.aspx
WEBEarlier 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 al. 2013) At GSA you'll find the resources, confidence, and connections you need to reach fulfilling new heights in your geoscience career. Join GSA.
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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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GEOLOGIC TIME SCALE v. 6 - Geological Society of America
https://www.geosociety.org/documents/gsa/timescale/timescl.pdf
WEBGEOLOGIC 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 5B C5B 5C C5C 5D C5D 5E C5E. 20 6 C6. 6A C6A. 6B C6B. …
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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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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
WEBLumen Learning. Book: Earth Science (Lumen) 11: Geologic History. 11.6: Geologic Time Scale. Expand/collapse global location. 11.6: Geologic Time Scale. Page ID. Table of contents. Evaluating Prior Knowledge. Geologic Time. Relative and Absolute Age Dating of Rocks. Geologic Time Scale. Lesson Summary. Review Questions. Vocabulary.
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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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8.1: The Geological Time Scale - Geosciences LibreTexts
https://geo.libretexts.org/Bookshelves/Geology/Physical_Geology_(Earle)/08%3A_Measuring_Geological_Time/8.01%3A_The_Geological_Time_Scale
WEBAug 11, 2020 · 8.1: The Geological Time Scale. Page ID. Steven Earle. Vancover Island University via BCCampus. William Smith worked as a surveyor in the coal-mining and canal-building industries in southwestern England in the late 1700s and early 1800s.
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