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or tar pit

[tahr-pit] /ˈtɑrˌpɪt/
seepage of natural tar or asphalt, especially an accumulation that has acted as a natural trap into which animals have fallen and sunk and had their bones preserved.
Origin of tarpit
First recorded in 1830-40; tar1 + pit1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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tar pit in Science
tar pit  
An accumulation of natural tar or asphalt at the Earth's surface, especially one that traps animals and preserves their hard parts. Tar pits form when petroleum in subterranean petroleum-bearing rocks oozes up to the surface. As it rises, the petroleum loses its volatile components, forming a thick tar or asphalt deposit.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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