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a. See: marker
b. A stratigraphic bed selected for use in preparing structural,
paleogeologic, and other maps that emphasize the nature or attitude of a
plane or a surface. It is generally selected for lithologic
characteristics, but biologic factors and unconformities may control.
Syn: indicator;
key bed; marker horizon. See also:
horizon; marker.
CF: indicator
Source:
Dictionary of Mining, Mineral, and Related Terms
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