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paleosol

[pey-lee-uh-sawl, -sol or, esp. British, pal-ee-uh-]
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noun
  1. a fossil soil preserved within a sequence of geological deposits, indicative of past conditions.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

paleosol in Science

paleosol

[pālē-ə-sôl′]
  1. A soil horizon from the geologic past, usually buried beneath other rocks or recent soil horizons.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.