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).
Geologic time | Periods, Time Scale, & Facts | Britannica
Nov 19, 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
Geologic Time Scale - Geology (U.S. National Park Service)
Oct 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, northern Alaska; CAK ...
Geological history of Earth - Wikipedia
The geological history of the Earth follows the major geological events in Earth's past based on the geological time scale, a system of chronological measurement based on the study of the planet's rock layers (stratigraphy).
Timeline of major Geological and Biological events
Nov 1, 2017 · The geologic time scale (GTS) is a system of chronological dating that relates geological strata (stratigraphy) to time, and is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships of events that …
Geologic Time Scale - Major Divisions of Geologic Time Chart
Divisions of Geologic Time shows the major chronostratigraphic (position) and geochronologic (time) units; that is, eonothem/eon to series/epoch divisions. Scientists should refer to the ICS time scale (Ogg, 2009) and resources on the National Geologic Map Database Web site (https://ngmdb.usgs.gov/Info/standards/) for stage/age terms.
Geological timechart - British Geological Survey
The BGS geological timechart provides colourful reference material for use in schools, colleges and at home, setting out the geological timescale and geochronological terms we use at BGS. You can browse the timechart by geological era in the page below or download the Phanerozoic Timechart as a pdf.
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 the Proterozoic were longer in duration than thinner units such as the Cenozoic. We also have a printable version of the Geologic Time Scale as a .pdf ...
Geologic Time Scale - HistoryTimeline.com
This is a complete, fully interactive timeline chart with 175 geological periods and over 300 events from the formation of the Earth to present day. The geological periods start with the Archean eon and end with the Holocene epoch.
Geologic Time Scales | Geologic Overview of the Trenton Group
In the Geologic Time Scale, time is generally divided on the basis of the earth's biotic composition, with the Phanerozoic Eon (i.e. the Paleozoic, Mesozoic and Cenozoic Eras) representing the period of Earth's history with advanced life forms, and the Pre Cambrian (or Proterozoic and Hadean Eras) representing the period before advanced life.