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a. Any ancient land; specif. an extensive area (such as the Canadian
shield) of ancient crystalline rocks reduced to low relief by
long-continued erosion and from which the materials of later sedimentary
deposits were derived. AGI
b. A region of older land, behind a coastal plain, that supplied the
material of which the coastal-plain strata were formed. AGI
c. A term proposed by Maxson and Anderson (1935) for the land surface of
the old-age stage of the cycle of erosion, characterized by subdued
relief. AGI
Source:
Dictionary of Mining, Mineral, and Related Terms
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