Geologic time scale - Wikipedia
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 …
GSA Geologic Time Scale - Geological Society of America
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Geologic time | Periods, Time Scale, & Facts | Britannica
2024年11月19日 · 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— …
Geologic Time Scale : Divisions, Periods and Eons - Geology Science
2023年12月6日 · The Geologic Time Scale is a system used by scientists to describe the timing and relationships between events in Earth’s history. It covers a vast expanse of time, from the …
Geologic Time Scale - Geology (U.S. National Park Service)
2021年10月5日 · Geologic time scale showing the geologic eons, eras, periods, epochs, and associated dates in millions of years ago (MYA).
International Commission on Stratigraphy (ICS) - IUGS
The primary objective of the International Commission on Stratigraphy (ICS) is to precisely define global units (systems, series, and stages) of the International Chronostratigraphic Chart that, …
Anthropocene as a proposed new time interval of Earth history, partly coincident with the Holocene. Currently, the Anthropocene has an informal designation, with a proposed age span …
Geologic Time Scale - Major Divisions of Geologic Time Chart
A 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 …
Geologic Time Scale - Geological Time Line
Our geologic time scale was constructed to visually show the duration of each time unit. This was done by making a linear time line on the left side of the time columns. Thicker units such as …
Geologic Time Scale: A List of Eons, Eras, and Periods - ThoughtCo
2020年2月28日 · 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 …
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