from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun geology one of the major groups of rock that makes up the
crustof the Earth; formed by the depositionof either the weatheredremains of other rocks, the results of biologicalactivity, or precipitationfrom solution
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun rock formed from consolidated clay sediments
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