Tags Geologic time scale

Tag: Geologic time scale

Terreneuvian Epoch

The Terreneuvian is the lowermost and oldest Series of the Cambrian geological System.Its base is defined by the first appearance datum of the trace...

Cambrian Period

The Cambrian is the first geological period of the Paleozoic Era, lasting from 541.0 ± 1.0 to 485.4 ± 1.9 million years ago (mya)...

Neoproterozoic Era

The Neoproterozoic Era is the unit of geologic time from 1,000 to 541 million years ago. The terminal Era of the formal Proterozoic Eon (or...

Mesoproterozoic Era

The Mesoproterozoic Era is a geologic era that occurred from 1,600 to 1,000 million years ago. The Mesoproterozoic was the first period of Earth's...

Paleoproterozoic Era

The Paleoproterozoic is the first of the three sub-divisions (eras) of the Proterozoic occurring between 2,500 to 1,600 million years ago. This is when...

Neoarchean Era

The Neoarchean is a geologic era within the Archaean. It spans the period of time from 2,800 to 2,500 million years ago—the period being...

Mesoarchean Era

The Mesoarchean  is a geologic era within the Archean, spanning 3,200 to 2,800 million years ago. The period is defined chronometrically and is not...

Paleoarchean Era

The Paleoarchean (/ˌpeɪlɪ.oʊ.ɑrˈkiːən/; also spelled Palaeoarchaean (Formerly known as early Archean)) is a geologic era within the Archaean. It spans the period of time...

Eoarchean Era

In the geologic record the Eoarchean (/ˌiːoʊ.ɑrˈkiːən/; also spelled Eoarchaean) Era or erathem is the earliest time following the solidification of Earth's crust. It...

Phanerozoic

The Phanerozoic is the current geologic eon in the geologic time scale, and the one during which abundant animal life has existed. It covers...

Precambrian

The Precambrian (Pre-Cambrian) is the large span of time in Earth's history before the current Phanerozoic Eon, and is a Supereon divided into several...

Cenozoic Era

The Cenozoic Era (also Cænozoic, Caenozoic or Cainozoic; meaning "new life", from Greek καινός kainos "new", and ζωή zoe "life") is the current and...

Mesozoic Era

The Mesozoic Era is an interval of geological time from about 252 to 66 million years ago. It is also called the Age of...

Paleozoic Era

The Paleozoic (or Palaeozoic) Era is the earliest of three geologic eras of the Phanerozoic Eon, spanning from roughly 541 to 252.2 million years...

Proterozoic Eon

The Proterozoic is a geological eon representing the time just before the proliferation of complex life on Earth. The name Proterozoic comes from Greek...

Archean Eon

The Archean  is a geologic eon before the Proterozoic Eon, before 2.5 Ga (billion years), or 2,500 million years ago. Classification issues Instead of being based...

Hadean Eon

The Hadean  is the first geologic eon of Earth and lies before the Archean. It began with the formation of the Earth about 4600...

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