Primary rocks


Also found in: Encyclopedia.
(Geol.) a term early used for rocks supposed to have been first formed, being crystalline and containing no organic remains, as granite, gneiss, etc.; - called also primitive rocks. The terms Secondary, Tertiary, and Quaternary rocks have also been used in like manner, but of these the last two only are now in use.

See also: Primary

References in classic literature ?
On an eternal ground, on hard primary rock, on this highest, hardest, primary mountain-ridge, unto which all winds come, as unto the storm- parting, asking Where?
But ploughed up to the primary rock of the matter, the two great principles laid down in the twin whaling laws previously quoted, and applied and elucidated by Lord Ellenborough in the above cited case; these two laws touching Fast-Fish and Loose-Fish, I say, will, on reflection, be found the fundamentals of all human jurisprudence; For notwithstanding its complicated tracery of sculpture, the Temple of the Law, like the Temple of the Philistines, has but two props to stand on.
shear (fault) zone mapped in the weathered and primary rocks.
Full browser ?