Span of geologic time that dates from 4.6 billion to 570 million years ago. Made up of three geologic eras: Hadean, Archean, and Proterozoic.

An informal term to include all geologic time from the beginning of the Earth to the beginning of the Cambrian period 570 million years ago.

also Pre-Cambrian, 1861, from pre- + Cambrian.

(4.5 billion years ago-542 million years ago) first supereon in Earth's history.

a span of geologic time lasting from 4600m to 570m years ago.

The geological era beginning with the formation of the earth, about 4700 million years ago and extending until about 590 million years ago. During this time the origin of life, the origin eukaryotes, and multicellular life-forms appeared. precious corals

The oldest of the Earth’s four eras. It stretches from the creation of the Earth - over 4500 million years ago - to the beginning of the Palaeozoic era. There isn’t a lot known about this era!

(n) the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago

The 'unofficial' time period that encompasses all time from the Earth’s formation, 4.55 billion years ago to 570 million years ago, the beginning of the Paleozoic Era.

The 'unofficial' time period that encompasses all time from the Earth's formation, 4.55 billion years ago to 570 million years ago, the beginning of the Paleozoic Era. more details...

extensive period of geological time used literally as ‘before the Cambrian

All geologic time from the beginning of Earth history to 570 million years ago. Also refers to the rocks that formed in that epoch. [Environmental Science and Technology; v31; 3461-67; 1997.] [Environ [..]

pree-kam-bree-uhn Rocks older than 600 million years. Earliest division of time for which rock strata are recognised.

formed prior to the Cambrian era approximately 600 million years ago.

(informal,geology) Relating to the time and geology dated before the Phanerozoic