This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A mud rich in organic matter formed at the bottom of a body of water.

n. A fluid slime found in swamps as a product of putrefaction.

n. an aquatic sludge-like sediment rich in organic matter formed in stagnant water

n. sludge (rich in organic matter) that accumulates at the bottom of lakes or oceans

"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."

ooze    muck    slime    gook    goo    sludge    goop    gunk    guck   

propel   

sapropelic