Crossword Genius

Mix of sand, silt and clay (4)

Ross

I believe the answer is:

loam

(Other definitions for loam that I've seen before include "Rich soil containing decayed matter" , "Rich soil with decayed vegetable matter" , "A rich fertile soil" , "Rich soil consisting of a mixture of sand, clay and decaying organic materials" , "Type of soil" .)

I've seen this clue in The New York Times.
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