Our team came up with a variety of fun ways to enjoy National Fossil Day– things like visiting your local Natural History Museum, watching or sharing an Eons video, eating an angiosperm, taking...

Divisions of geologic time The geologic time scale is divided into chronostratigraphic units and their corresponding geochronologic units. An eon is the largest geochronologic time unit and is equivalent …

Eons is available to stream on pbs.org and the free PBS App, available on iPhone, Apple TV, Android TV, Android smartphones, Amazon Fire TV, Amazon Fire Tablet, Roku, Samsung Smart TV, and Vizio.

Eons are the largest units of geologic time, spanning hundreds of millions to billions of years, and each represents a significant phase in Earth's history. Eon is the equivalent of a chronostratigraphic …

Dec 1, 2025 · 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 …

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.

Feb 13, 2023 · The answer is the geologic time scale, a system that divides Earth’s history into eons, eras, periods, and epochs. It’s the timeline that connects rocks to time — and time to life.

Feb 12, 2025 · Eons are the longest units of time, followed by eras, which are smaller divisions of eons. Periods are subdivisions of eras, and epochs are the shortest, marking smaller changes within periods.

The left half shows a timeline of Earth’s geologic history which is split into Eons, Eras, Periods, and Epochs and how many millions of years ago (MYA) these occurred.

The Hadean (/ heɪˈdiːən, ˈheɪdiən / hay-DEE-ən, HAY-dee-ən) is the first and oldest of the four geologic eons of Earth 's history, starting with the planet's formation about 4.6 Ga [4][5] (estimated 4567.30 ± …