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from the GNU version of the Collaborative International Dictionary of English

  • adj. Pertaining to the upper portion of the Laurentian rocks.

from The Century Dictionary and Cyclopedia

  • n. In geology, noting a subdivision of the Arch├Žan next above the Laurentian, a group characterized by great masses of gabbro and related anorthosite: proposed by T. Sterry Hunt, who adopted the following succession: Laurentian, Norian, Arvonian, Huronian, Montalban, and Taconian.


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