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a. An overlap characterized by the regular and progressive pinching out,
toward the margins or shores of a depositional basin, of the sedimentary
units within a conformable sequence of rocks, in which the boundary of
each unit is transgressed by the next overlying unit and each unit in turn
terminates farther from the point of reference. Also, the successive
extension in the lateral extent of strata (as seen in an upward sequence)
due to their being deposited in an advancing sea or on the margin of a
subsiding landmass. Ant: offlap. Syn:
transgressive overlap CF:
overlap
b. The progressive submergence of land by an advancing sea.
CF: transgression
Source:
Dictionary of Mining, Mineral, and Related Terms
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