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).

4 days ago · 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) …

The Geologic Timescale (Figure 7) was first constructed by geologists in the 1800s before the discovery of radioactive decay that provides the clock used in many numeric dating …

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.

Geologists have divided Earth's history into a series of time intervals. These time intervals are not equal in length like the hours in a day. Instead the time intervals are variable in length. This is …

Use the links in the "time machine" below and explore a specific period that interests you. Read more about the geologic time scale, its origins and its time divisions. Find out more about plate …

May 13, 2025 · Scientists use the geologic time scale to organize Earth's long history into eons, eras, and periods. The Phanerozoic eon is known for the appearance and dominance of …

Thus, the results of studies of rock layers (stratigraphy), and of fossils (paleontology), coupled with the ages of certain rocks as measured by atomic clocks (geochronology), attest to a very …

The Geologic Time Scale, as shown above, documents intervals of geologic time relative to one another, and has been continuously developed and updated over the last two centuries.

The Geologic Time Scale shows the names of all of the eons, eras, and periods throughout geologic time, along with some of the epochs. (The time scale is simplified to include just the …

Dec 6, 2023 · 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 North America Part 1: North America Part 2: North America Part 3: North America Part 4: South America Part 5: South America Part 6: Africa Part 7: Africa Part 8: Africa Part 9: …

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

Scientists use the geologic time scale to illustrate the order in which events on Earth have happened. The geologic time scale was developed after scientists observed changes in the …

Relative time is the physical subdivision of the rocks found in the Earth's geology and the time and order of events they represent. Absolute time is the measurement taken from the same rocks …

Effective communication in the geosciences requires consistent uses of stratigraphic nomenclature, especially divisions of geologic time. A geologic time scale is composed of …

This vast span of time, called geologic time by earth scientists, is difficult to comprehend in the familiar time units of months and years, or even centuries. How then do scientists reckon …

Using this time scale, geologists can place all events of Earth’s history in order without ever knowing their numerical ages. The specific events within Earth’s history are discussed in …

Feb 12, 2024 · Geologists start counting “geologic time” from Earth’s surface downward; that is, starting with younger surficial deposits and descending into older rocks and deeper time. …

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.

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, …

Jan 29, 2024 · Learn below about the ages of important events in the fossil record and Earth's history during different geologic time intervals. Associated maps show the distributions of …