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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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