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).

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.

Dec 1, 2025 · Geologic time, the extensive interval of time occupied by the geologic history of Earth. Formal geologic time begins with the Archean Eon (4.0 billion to 2.5 billion years ago) and continues …

The Geologic Time Scale above is a helpful reference to use along with the information provided below. The left half shows a timeline of Earth’s geologic history which is split into Eons, Eras, Periods, and …

Jan 11, 2025 · Learn about the geologic time scale or GTS. Discover what it is, how it is divided, and the characteristics of each time period.

Feb 12, 2024 · The geologic time scale began to take shape in the 1700s. Geologists first used relative age dating principles to chart the chronological order of rocks around the world.

Geologic periods are subdivisions of eras. They are defined based on major changes in the fossil record, which reflect changes in the Earth's environment and the evolution of life.

Jul 27, 2025 · Earth’s eight geological eras tell the story of chaos and order, destruction and creation, extinction and rebirth. They are not just divisions of time, but testaments to the planet’s resilience …

Geologic Time Scale: Divisions of Geologic Time approved by the U.S. Geological Survey Geologic Names Committee, 2010. The chart shows major chronostratigraphic and geochronologic units.

Outline how natural selection takes place as a mechanism of evolution Describe stratigraphic correlation List the eons, eras, and periods of the geologic time scale and explain the purpose behind the …