Kinds of Unconformities Angular Dis Non and para Unconformities geology earthscience

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Angular Unconformity • Description: Occurs when younger horizontal layers are deposited on top of older layers that have been tilted or folded and then eroded. The bedding planes of the older rocks are at an angle to those of the overlying younger rocks. • Example: The famous Hutton's Unconformity in Scotland. • Disconformity • Description: A type of unconformity where the rock layers above and below are parallel, but there is a distinct erosional boundary separating them. The missing time interval is due to erosion or a pause in deposition. • Example: Common in shallow marine sedimentary sequences, where there is an interruption in sedimentation followed by renewed deposition. • Nonconformity • Description: Occurs when sedimentary rock layers are deposited directly on top of igneous or metamorphic rocks. The erosional surface separates the two different types of rocks, indicating a significant geological event. • Example: The Grand Canyon contains several examples of nonconformities where sedimentary rocks overlie the ancient metamorphic and igneous basement. • Paraconformity • Description: A type of unconformity where there is no apparent erosional surface, but fossil or radiometric evidence shows a significant time gap between the layers. The boundary is typically marked only by a hiatus in deposition. • Example: Difficult to recognize visually and often inferred from paleontological 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