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THILL [1 record]

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Alphabetical list of terms

Record 1 2015-04-13

English

Subject field(s)
  • Geology
DEF

A layer of fine-grained detrital material, usually clay, lying immediately beneath a coal bed or forming the floor of a coal seam. It represents the old soil in which the plants (from which the coal was formed) were rooted, and it commonly contains fossil roots ... It is often a "fireclay" ...

French

Domaine(s)
  • Géologie
DEF

Couche d'argile formant le mur d'une couche de houille.

CONT

Les Américains appellent «underclays» les roches argileuses qui sont situées au mur des couches de houille [...]. Il est évident que la minéralogie des «underclays» est variée puisque les roches dont elles sont issues le sont, mais des variations supplémentaires surviennent.

Spanish

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