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The relation between adjacent rock strata whose time of deposition was separated by a period of nondeposition or of erosion; a break in a stratigraphic sequence.



(geology), the occurrence of relatively young strata of rock on the erosion surface of older strata. There are two main types of unconformities: parallel and angular. In parallel unconformities (disconformities), strata of different ages lie parallel to one another and are separated only by an erosion surface—a stratigraphic break. In angular unconformities (disconformities), strata of different ages are not only separated by an erosion surface but dip at different angles; as a result, the ends of the old strata abut the base of the younger overlying stratum. Angular unconformities are formed when previously deposited strata have been tilted or folded and then the upper parts of the strata destroyed (by marine erosion, for example) and layers of a new stratum deposited on the erosion surface.

The study of unconformities is of great importance in elucidating the history of the movements and deformations of the earth’s crust. Analysis of unconformities also helps date magmatic activity, ore formation, and other geological processes.

References in periodicals archive ?
Phillips also suggests employers consider providing training on gender identity and gender noncomformity issues.
Ultimately, Giordana's film suggests the impossibility of desiring differently in a mafia context, both on and offscreen, and Peppino's death resolves his noncomformity.
Garro, supra note 123, at 471-73 (discussing the "uneasy" compromise reached regarding notice of noncomformity and arguing that this compromise, which hinges on several open-ended terms like "reasonable," was necessary to accommodate the competing visions of the drafters).
By this point, a cynic might say, Larson's brave, sweet-natured musical was in danger of becoming a shallow co-optation of the down-and-out, HIV-positive characters whose passionate noncomformity ``Rent'' celebrates.