a. An easily recognized stratigraphic feature having characteristics distinctive enough for it to serve as a reference or datum or to be traceable over long distances, esp. in the subsurface, as in well drilling or in a mine working; e.g., a stratigraphic unit readily identified, or any recognizable rock surface such as an unconformity or a corrosion surface. See also: format marker formation. CF: horizon
b. A layer that yields characteristic reflections over a more or less extensive area. AGI
c. A layer that accounts for a characteristic segment of a seismic-refraction time-distance curve and can be followed over reasonably extensive areas. AGI
d. S. Afr. See: outcrop
e. See: marker block
Source: Dictionary of Mining, Mineral, and Related Terms












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