- 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 process of relating strata to time) and geochronology (a scientific branch of geology that aims to determine the age of rocks)
- GSA Geologic Time Scale - Geological Society of America
At GSA you'll find the resources, confidence, and connections you need to reach fulfilling new heights in your geoscience career
- Geologic Time Scale - Geology (U. S. National Park Service)
Geologic time scale showing the geologic eons, eras, periods, epochs, and associated dates in millions of years ago (MYA)
- Geologic time | Periods, Time Scale, Facts | Britannica
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
- Geologic Time Scale : Divisions, Periods and Eons - Geology Science
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 formation of the planet nearly 4 6 billion years ago to the present day
- 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, in turn, are the basis for the units (periods, epochs, and age) of the International Geologic Time Scale
- Geologic Time Scale: Eons, Eras, Periods and Epochs
The Geologic Time Scale is divided into four eons, ten eras, 22 periods, and several epochs and ages Each eon, era, period, and epoch is defined by major geological or paleontological events The eons are the Hadean, Archean, Proterozoic, and Phanerozoic
- Geologic Time Scale - Science Notes and Projects
The Geologic Time Scale or Geological Time Scale (GTS) is a chronological framework that organizes Earth’s history into various units based on geological and paleontological evidence It divides Earth’s 4 6 billion-year history into hierarchical units such as eons, eras, periods, epochs, and ages
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