Cropmark
Means through which sub-surface features can be visible from the air / From Wikipedia, the free encyclopedia
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For other uses, see Crop mark.
Cropmarks or crop marks are a means through which sub-surface archaeological, natural and recent features may be visible from the air or a vantage point on higher ground or a temporary platform. Such marks, along with parch marks,[1] soil marks and frost marks, can reveal buried archaeological sites that are not visible from the ground.