The Precambrian is divided into three eons: the Hadean (4567–4031 Ma), Archean (4031-2500 Ma) and Proterozoic (2500-538.8 Ma). See Timetable of the Precambrian. Proterozoic: this …

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 to a …

Eons. The eon is the broadest category of geological time. Earth's history is characterized by four eons; in order from oldest to youngest, these are the Hadeon, Archean, Proterozoic, and …

Each eon, era, period, and epoch is defined by major geological or paleontological events. The eons are the Hadean, Archean, Proterozoic, and Phanerozoic. The Phanerozoic Eon is the …

Eon, Long span of geologic time. In formal usage, eons are the longest portions of geologic time (eras are the second-longest). Three eons are recognized: the Phanerozoic Eon (dating from …

Feb 28, 2020 · The most recent geologic eon is the Phanerozoic, which began about 540 million years ago. This eon is very distinct from the previous three—the Hadean, Archean, and …

Dec 6, 2023 · The third eon, the Proterozoic, lasted from 2.5 billion to 541 million years ago. This was a time of the evolution of early life forms and the formation of the first continents.

Jan 11, 2025 · The four eons are the Hadean, Archean, Proterozoic, and Phanerozoic. The Hadean era lasted around 600 million years and includes the formation of the Earth and Moon. …

An Eon is the longest division of geologic time, so long in fact that there have only been four Eons. Collectively the first three eons are called the Precambrian, that stretch of geological …

Dec 16, 2024 · The primarily defined divisions of time are eons, the Hadean, the Archean, the Proterozoic and the Phanerozoic. The first three of these can be referred to collectively as the …