- Archean rocks
- subst.(geologi) grunnfjell
English-Norwegian dictionary. 2013.
Archean rocks
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Archean — The Archean (pronEng|ɑrˈkiːən, also spelled Archaean, formerly called the Archaeozoic (IPA|/ɑrkiəˈzoʊɪk/), also spelled Archeozoic or Archæozoic) is a geologic eon before the Proterozoic and Paleoproterozoic, before 2.5 Ga (billion years ago, or… … Wikipedia
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
archean protaxis — noun Usage: usually capitalized A : the area or mass of Archean rocks in any continent that throughout post Archeozoic time remained a land area … Useful english dictionary
Archean — [är kē′ən] adj. [< Gr archaios, ARCHAIC] [sometimes a ] designating or of the geologic eon characterized by the development of the first igneous and metamorphic rocks and the first marine microorganisms; Precambrian, esp. early Precambrian… … English World dictionary
Archean — or Archaean adjective Etymology: Greek archaios Date: 1872 1. of, relating to, or being the earliest eon of geological history or the corresponding system of rocks see geologic time table 2. Precambrian • Archean noun … New Collegiate Dictionary
Archean — /ahr kee euhn/, adj. Geol. noting or pertaining to rocks of the Archeozoic portion of the Precambrian Era. Also, Archaean. [1870 75; < Gk archaî(os) ancient (see ARCHAEO ) + AN] * * * … Universalium
archean — adj. (Geology) of or pertaining to the earliest known forms of rocks; of or belonging to the earlier of the two divisions of Precambrian time … English contemporary dictionary
Archean — Ar•che•an [[t]ɑrˈki ən[/t]] adj. gel of or pertaining to rocks of the Archeozoic portion of the Precambrian Era • Etymology: 1870–75 … From formal English to slang
Oldest dated rocks — The oldest dated rocks on Earth, as an aggregate of minerals that have not been subsequently melted or disaggregated by erosion, are from the Archean Eon. Such rocks are exposed on the surface in very few places.[1] There is some controversy… … Wikipedia
City of Rocks National Reserve — There is also City of Rocks State Park in New Mexico. City of Rocks National Reserve IUCN Category V (Protected Landscape/Seascape) … Wikipedia
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
