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The act or process of laying in strata, or the state of being laid in the form of strata, or layers.

Stratification among or between other layers or strata; also, that which is interstratified.

s of the unit of measure than could be conveniently marked on a plain scale. -- Diagonal stratification. (Geol.) Same as Cross bedding, under Cross, a.

A plane of fracture, or divisional plane, of a rock transverse to the stratification.

- Slate rocks (Min.), rocks which split into thin laminæ, not necessarily parallel to the stratification; foliated rocks. -- Slate spar (Min.), a variety of calcite of silvery white luster and of a slaty structure. -- Transparent slate, a plate of translucent material, as ground glass, upon which a copy of a picture,…

pecially to those cases in which the planes of cleavage are not parallel to the planes of stratification. It is now believed to be caused by the compression which the strata have undergone. -- Slaty gneiss (Min.), a variety of gneiss in which the scales of mica or crystals of hornblende, which are usually minute, form…

secting other rocks, and filling inclined or vertical fissures not corresponding with the stratification; a lode; a dike; -- often limited, in the language of miners, to a mineral vein or lode, that is, to a vein which contains useful minerals or ores.