The systematic organization of the earth`s rock bodies, as they are found in their original relationships, into units based on any of the properties or attributes that rocks may possess (see section 3.a.3).
A borehole drilled specifically to obtain a detailed record of the character and composition of the rock formations penetrated and not for the purpose of locating a mineral deposit.
The process whereby sediments and (or) fossils o f a younger age are deposited within or under older rocks. the result or product o f the process of stratigraphic leakage is stratigraphic leak (foster, 1966, p. 2604).
A petroleum trap that occurs when the top of the reservoir bed is terminated by other beds or by a change of porosity or permeability within the reservoir itself. compare structural trap.
A body of rock recognized as a unit (distinct entity) in the classification of the earth’s rocks, based on any of the many properties and attributes that rocks possess. stratigraphic units based on one property will not necessarily coincide with those based on another (see section 3.a.4).
