Dictionary
su•per•im•posed
Pronunciation: (sOO"pur-im-pōzd'), [key]—
adj. Geol.
(of a stream or drainage system) having a course not adjusted to the structure of the rocks presently undergoing erosion but determined rather by a prior erosion cycle or by formerly overlying rocks or sediments.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.