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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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SITE *
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Unclassifiable site with minimal information. Specify site type wherever possible.
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BUILDING *
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A structure with a roof to provide shelter from the weather for occupants or contents. Use specific type where known.
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CHURCH *
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A building used for public Christian worship. Use more specific type where known.
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* Copyright of English Heritage (1999)