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Meaning of superimposed

su•per•im•posed

Pronunciation: (s"pur-im-pōzd'), [key]
— adj. Geol.
  1. (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.
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