| − | A surface of erosion that separates one layer of rock from another.<ref>Wile, Dr. Jay L. ''Exploring Creation With General Science''. Anderson: Apologia Educational Ministries, Inc.
| + | According to the online Merriam-Webster dictionary a '''unconformity''' is "lack of continuity in deposition between rock strata in contact corresponding to a period of nondeposition, weathering, or erosion." <ref>http://www.m-w.com/dictionary/unconformity</ref> |