foliation

views updated May 08 2018

foliation A continuous, sub-planar rock fabric formed by the preferred orientation of minerals with a generally platy or tabular habit. The layers are planar, and parallel but not necessarily to bedding or cleavage. The term ‘foliation’ is commonly applied to textures in high-grade metamorphic rocks (see METAMORPHIC GRADE).

A Dictionary of Earth Sciences AILSA ALLABY and MICHAEL ALLABY

foliation

views updated May 23 2018

foliation
A. being in leaf, arrangement in leaves XVII;

B. consecutive numbering of folios XIX. In A. f. L. folium; see FOIL2, -ATION. In B. f. FOLIO.

The Concise Oxford Dictionary of English Etymology T. F. HOAD

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