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PRECAMBRIAN ROCK [1 record]

Record 1 1997-08-12

English

Subject field(s)
  • Petrography
DEF

Rock that originates from the geologic period in history from about 4.5 to 5 billion years ago to about 570 million years ago. Precambrian rock covers about 75% of the land area of the earth.

CONT

The bedrock consists mainly of Precambrian rocks of the Canadian Shield.

French

Domaine(s)
  • Pétrographie
DEF

roches précambriennes : roches qui se sont formées au cours de la période géologique qui s'est étendue d'environ 4,5 - 5 milliards d'années à environ 570 millions d'années. Ces roches recouvrent approximativement 75 p. 100 de la surface terrestre.

CONT

La roche en place est principalement constituée de roches précambriennes du Bouclier Canadien.

Spanish

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