paleosol

[pey-lee-uh-sawl, -sol or, esp. British, pal-ee-uh-]
noun
a fossil soil preserved within a sequence of geological deposits, indicative of past conditions.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
paleosol   (pā'lē-ə-sôl')  Pronunciation Key 
A soil horizon from the geologic past, usually buried beneath other rocks or recent soil horizons.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Overlying the gravel-dominated flood deposits is a thick calcic paleosol sequence.
Lamination is commonly indistinct due to burrowing, desiccation, and paleosol formation.
Paleosol horizons, which are common in the upper section of the core, give way to intervals of poorly-sorted pebbly sandstones.
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