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overstep
An overstep is a geological form where there is deposition of a stratum across inclined, progressively older rocks.〔Alistair F. Pitty ''Structure and Relief'' 1985 Page 28 "An overstep is a geological term describing the deposition of a stratum across inclined, progressively older rocks, as seen on both flanks of the Market Weighton axis (figure 9). In South East England, the Lower Greensand is another very ..."〕 An onlap is a more general term than overstep, in which the younger beds overlap onto successively older beds.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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