Laurentian period
Laurentian Lau*ren"tian, a. Pertaining to, or near, the St. Lawrence River; as, the Laurentian hills. [1913 Webster]

{Laurentian period} (Geol.), the lower of the two divisions of the Arch[ae]an age; -- called also {the Laurentian}. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • Laurentian — Lau*ren tian, a. Pertaining to, or near, the St. Lawrence River; as, the Laurentian hills. [1913 Webster] {Laurentian period} (Geol.), the lower of the two divisions of the Arch[ae]an age; called also {the Laurentian}. [1913 Webster] …   The Collaborative International Dictionary of English

  • Laurentian — 1. adjective /ləˈrenʃən,lɒˈrɛnʃən,lɒˈrɛnʃiən,lɑˈrɛnʃən/ a) Relating to a Precambrian geological region in eastern Canada, or the period of its formation. In the Laurentian hills. b) Relating to the Laurentian Mountains. 2. noun… …   Wiktionary

  • Laurentian Mountains — Geobox|Range name=Laurentian Mountains image size=275 image caption=The Laurentian Mountains in the Hautes Gorges Quebec national park, Charlevoix, Quebec, Canada. country=Canada region=Quebec|region type=Province highest=Mont Raoul Blanchard… …   Wikipedia

  • the Laurentian — Laurentian Lau*ren tian, a. Pertaining to, or near, the St. Lawrence River; as, the Laurentian hills. [1913 Webster] {Laurentian period} (Geol.), the lower of the two divisions of the Arch[ae]an age; called also {the Laurentian}. [1913 Webster] …   The Collaborative International Dictionary of English

  • Silurian Period — Interval of geologic time, 443–417 million years ago. The third period of the Paleozoic Era, the Silurian follows the Ordovician Period and precedes the Devonian. It marks the first appearance of land plants and jawed fishes. The continents were… …   Universalium

  • Ordovician Period — Interval of geologic time, 490–443 million years ago, the second oldest period of the Paleozoic Era. It follows the Cambrian and precedes the Silurian. During the Ordovician, many of the landmasses were aligned in the tropics. Life was dominated… …   Universalium

  • Cambrian Period — Oldest time division of the Paleozoic Era. During the Cambrian, 543–490 million years ago, there were widespread seas and several scattered landmasses. The largest continent was Gondwana. The average climate was probably warmer than today, with… …   Universalium

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  • North America — North American. the northern continent of the Western Hemisphere, extending from Central America to the Arctic Ocean. Highest point, Mt. McKinley, 20,300 ft. (6187 m); lowest, Death Valley, 276 ft. (84 m) below sea level. 400,000,000 including… …   Universalium

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