Norian

词形变化

the Norian

释义与例句

adj.
  1. 1.

    Relating to the upper portion of the Laurentian rocks.

    地质

    The Norian rock is distinguished by the abundance of labradorite, a feldspar possessing iridescent tints, and is found in Essex County, New York, Labrador, extensively along the St. Lawrence, upon Lake Huron, while "bowlders of it are occasionally found along the eastern shores of Maine and Massachusetts, and also in northern New Jersey."

name
  1. 1.

    An age from 216.5 ± 2.0 to 203.6 ± 1.5 532 to 523 million years ago, a subdivision of the Triassic.

    地质

词源

From norite.

来源：wiktionary