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law of superposition

Geology. a basic law of geochronology, stating that in any undisturbed sequence of rocks deposited in layers, the youngest layer is on top and the oldest on bottom, each layer being younger than the one beneath it and older than the one above it. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for law of superposition
  • The law of superposition helps us understand the relative age relationships of fossils found in sedimentary rock layers.
  • The oldest rocks are at the bottom, and the youngest are at the top, illustrating the law of superposition.
  • Students will explore the law of superposition and the processes of fossilization in sedimentary rock.
  • The law of superposition tells us that the layer on the bottom is the oldest, and the layers get younger as they pile up.
law of superposition in Science
law of superposition  
  1. Physics See superposition.

  2. Geology A general law stating that in any sequence of sediments or rocks that has not been overturned, the youngest sediments or rocks are at the top of the sequence and the oldest are at the bottom.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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