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Cropmark
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Cropmarks appear as light and dark marks in growing and ripening crops. These marks relate to differences in the soil below. For example, parched lines of grass may indicate stone walls. Crops that grow over stone features often ripen more quickly and are shorter than the surrounding crop. This is because there is less moisture in the soil where the wall lies.
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SETTLEMENT *
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A small concentration of dwellings.
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FEATURE *
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Areas of indeterminate function.
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* Copyright of English Heritage (1999)