Definition of "sapropel" []

• A mud rich in organic matter formed at the bottom of a body of water. (noun)
• A fluid slime found in swamps as a product of putrefaction. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Throughout the Black Sea the cores showed the same stratigraphy: a sediment with remains of freshwater mollusks overlain by a wet, dark, organic-rich layer known as a sapropel, above which are normal marine sediments with saltwater mollusk shells."
• "Remains of freshwater creatures killed by the saltwater and of terrestrial plants inundated by it settled in an organic rich blanket over the bottom, the sapropel found throughout the Black Sea basin today."
• "(Another expedition obtained similar dates for the base of the sapropel in nine other cores.)"