Useful english dictionary. 2012.
Precambrian — For the album by German band The Ocean, see Precambrian (album). Precambrian Period 4567.17–542 million years ago … Wikipedia
Precambrian aeon — noun the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago • Syn: ↑Precambrian, ↑Precambrian eon, ↑Precambrian period • Instance Hypernyms: ↑eon, ↑aeon • Part Meronym … Useful english dictionary
Precambrian period — noun the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago • Syn: ↑Precambrian, ↑Precambrian eon, ↑Precambrian aeon • Instance Hypernyms: ↑eon, ↑aeon • Part Meronyms … Useful english dictionary
Precambrian — [prē kam′brē ən] adj. [sometimes p ] designating or of the division of geologic time covering all the time before the Cambrian Period, equivalent to the Archean Eon and the Proterozoic Eon designating or of the division of geologic time covering… … English World dictionary
Precambrian time — Interval of geologic time from с 3. 8 billion years ago, the age of the oldest known rocks, to 544 million years ago, the beginning of the Cambrian Period. This interval represents more than 80% of the geologic record and thus provides important… … Universalium
Archean eon — noun the time from 3,800 million years to 2,500 million years ago; earth s crust formed; unicellular organisms are earliest forms of life • Syn: ↑Archean, ↑Archean aeon, ↑Archeozoic, ↑Archaeozoic, ↑Archeozoic eon, ↑Archaeozoic aeon •… … Useful english dictionary
Archeozoic eon — noun the time from 3,800 million years to 2,500 million years ago; earth s crust formed; unicellular organisms are earliest forms of life • Syn: ↑Archean, ↑Archean eon, ↑Archean aeon, ↑Archeozoic, ↑Archaeozoic, ↑Archaeozoic aeon • Derivationally… … Useful english dictionary
Proterozoic eon — noun from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms • Syn: ↑Proterozoic, ↑Proterozoic aeon • Derivationally related forms: ↑proterozoic (for: ↑Proterozoic) … Useful english dictionary
Archean Eon — or Archaean Eon or Archeozoic Eon Older of the two divisions of Precambrian time. The Archean begins with the formation of the Earth s crust с 3.8 billion years ago and extends to с 2.5 billion years ago, up to the start of the Proterozoic Eon,… … Universalium
Timetable of the Precambrian — This is a timeline of geological and relevant astronomical events on Earth before the Cambrian period started. This covers 88% of the duration of the Earth. The dates given are based on the best current scientific evidence and where possible are… … Wikipedia
