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An unconformity is a contact between two rock units in which the upper unit is usually much younger than the lower unit. There are three forms of unconformities: disconformity, nonconformity, angular unconformity. A nonconformity exists between sedimentary rocks and metamorphic or igneous rocks when the sedimentary rock lies above and was deposited on the pre-existing and eroded metamorphic or igneous rock.
Related Journals of Nonconformity Geology