Archean Definition

ärkēən
adjective
Of, relating to, or being the older of the two divisions of Precambrian time, from about 3.8 to 2.5 billion years ago, marked by an atmosphere with little free oxygen, the formation of the first rocks and oceans, and the development of unicellular life.
American Heritage
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.
Webster's New World
Of, relating to, or being the oldest known rocks, those of the Precambrian Eon, that are predominantly igneous in composition.
American Heritage

Alternative form of Archaean.

Wiktionary
Synonyms:
noun
The Archean Eon.
American Heritage
Synonyms:
pronoun

Alternative form of Archaean.

Wiktionary

Idioms, Phrasal Verbs Related to Archean

  • the Archean

Origin of Archean

  • From Greek arkhaios ancient archaic

    From American Heritage Dictionary of the English Language, 5th Edition

Archean Sentence Examples

  • In other words, if there was such a thing as an original crust, which may be looked upon as an open question, the Archean, as now defined, does not appear to represent it.

  • The meta-sedimentary rocks of the Archean include metamorphosed limestone, and schists which carry carbonaceous matter in the form of graphite.

  • The marble and graphite, as well as some other indirect evidence of life less susceptible of brief statement, have been thought by many geologists sufficient to warrant the inference that life existed before the close of the era when the Archean rocks were formed.

  • Most of tie Archean rocks fall into one or the other of two great series, a schistose series and a granitoid series, the latter being in large part intrusive in the former.

  • The likeness of the Archean of one part of the country to that of another is one of its striking features.

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Words Starting With

AARARC

Words Ending With

NANEAN

Unscrambles

Archean

Words Starting With A and Ending With N

Starts With A & Ends With NStarts With AR & Ends With NStarts With A & Ends With AN

Word Length

7 Letter Words7 Letter Words Starting With A7 Letter Words Ending With N