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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Sajan sarthak Best Answer
An overstep is a geological form that has a deposition of a stratum across inclined, progressively older rocks. An onlap is a more general term than overstep, in which the younger beds overlap onto successively older beds. Here the answer can be both onlap and overstep . see the attached file for more information
Please explain why remain 2 options are not correct
Angular unconformity has a angular relationship with the lower top beds but here the top beds overlapping each other. overlap is a outdated term . Onlap or overlap is the geologic phenomenon of successively wedge-shaped younger rock strata extending progressively further across an erosion surface cut in older rocks. It is generally associated with a marine transgression. It is a more general term than overstep, in which the younger beds overlap onto successively older beds.
see these answers
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