• WordNet 3.6
    • adj surficial pertaining to or occurring on or near the earth's surface "a surficial geologic deposit"
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Century Dictionary and Cyclopedia
    • surficial Of or pertaining to a surface; superficial; in geology, relating to the phenomena of the land-surface, especially to the unconsolidated materials (drift, rock-waste) of the land-surface.
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Chambers's Twentieth Century Dictionary
    • adj Surficial sur-fish′al formed on the surface, as opposed to Subterranean.
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In literature:

The zinc oxide minerals in the surficial zone also are sometimes colored yellow by small amounts of greenockite.
"The Economic Aspect of Geology" by C. K. Leith