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BLUE-ROCK PHOSPHATE [1 record]

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Record 1 1978-01-18

English

Subject field(s)
  • Chemical Engineering
  • Geology
OBS

A term used for the Ordovician, bedded, bluish-gray phosphates of Tennessee.

OBS

The hard, bluish-gray, Ordovician bedded phosphates of central Tennessee.

French

Domaine(s)
  • Génie chimique
  • Géologie
OBS

Les «roches bleues» sont des couches ou des lentilles de calcaires phosphatés, intercalées dans des grès du Dévonien supérieur ou du Mississippien inférieur. Elles sont exploitées dans le centre de l'État [du Tennessee], où elles ont l'aspect d'un conglomérat oolithique. L'épaisseur atteint un peu plus de 1 mètre.

Spanish

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