norian definition

  • adjective:
    • regarding top of the portion of the Laurentian rocks.
  • noun:
    • In geology, noting a subdivision of this Archæan next over the Laurentian, an organization described as great masses of gabbro and relevant anorthosite: recommended by T. Sterry Hunt, who adopted the following succession: Laurentian, Norian, Arvonian, Huronian, Montalban, and Taconian.
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