cropmark
Sign in to saveAlso known as crop-mark, crop mark
thumb|300px|right|Cropmarks at a protohistoric site at [[Grézac, France]]
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Encyclopedic overview
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thumb|300px|right|Cropmarks at a protohistoric site at [[Grézac, France]]
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, soil marks and frost marks, can reveal buried man-made structures that are not visible from the ground.
Excerpted from Wikipedia’s “cropmark” article, available under the CC BY-SA 4.0 licence.