An overstep is a

geological Geology () is a branch of natural science concerned with Earth and other astronomical objects, the features or rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Eart ...

form that has a deposition of a

stratum In geology and related fields, a stratum ( : strata) is a layer of rock or sediment characterized by certain lithologic properties or attributes that distinguish it from adjacent layers from which it is separated by visible surfaces known as e ...

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 South East England is one of the nine official regions of England at the first level of ITL for statistical purposes. It consists of the counties of Buckinghamshire, East Sussex, Hampshire, the Isle of Wight, Kent, Oxfordshire, Berkshi ...

, the Lower

Greensand Greensand or green sand is a sand or sandstone which has a greenish color. This term is specifically applied to shallow marine sediment that contains noticeable quantities of rounded greenish grains. These grains are called ''glauconies'' and co ...

is another very ..." The

Indira Gandhi National Open University Indira Gandhi National Open University, known as IGNOU, is a Central University located at Maidan Garhi, New Delhi, India. Named after former Prime Minister of India Indira Gandhi, the university was established in 1985 with a budget of 20 ...

syllabus definition is: "The term ''overstep'' is used to describe the relationship of beds in an unconformable sequence where the younger series rests upon progressively older members of the underlying series."Indira Gandhi National Open University (School of Sciences), (Undated). ''BGYCT-131 - Physical And Structural Geology, Block 3 - Structural Geology, Unit 12 - Joints And Unconformities''. egyankosh.ac.in
Archived
An onlap is a more general term than overstep, in which the younger beds overlap onto successively older beds.

References

Stratigraphy {{Geology-stub