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. …

Oct 5, 2021 · Geologic time scale showing the geologic eons, eras, periods, epochs, and associated dates in millions of years ago (MYA).

Dec 1, 2025 · geologic time, the extensive interval of time occupied by the geologic history of Earth. Formal geologic time begins at the start of the Archean Eon (4.0 billion to 2.5 billion …

Chart of the Divisions of Geologic Time approved by the U.S. Geological Survey Geologic Names Committee, 2018. The chart shows major chronostratigraphic and geochronologic units.

May 13, 2025 · Geologic time spans are divided into units and subunits, the largest of which are eons. Eons are divided into eras, which are further divided into periods, epochs, and ages. …

Jan 11, 2025 · Definition: The Geological Time Scale (GTS) organizes Earth’s 4.6 billion-year history into hierarchical units (eons, eras, periods, epochs, and ages) based on geological and …

Below is a simplified Geologic Time Chart. The purpose of this chart is to help you easily find in-depth information on eons, eras, and periods of earth’s history. We think it is convenient and …

This geologic time chart shows whats going on in a geologic time scale table in a way that is easy to read, understand and learn about the history of the earth.

The Earth was formed about 4,550 Ma, but the earliest known rocks are less than 4,000 Ma. The interval from 4,550 Ma to about 4,000 Ma is sometimes known as the Hadian Eon. This chart …

Throughout this lab manual, you will mainly see us referencing periods of geologic time. Figure 3.1 – The geologic time scale subdivided by eon, era, system, series, epoch, and stage. What …