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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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Aerial Photograph
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Aerial photographs are taken during an aerial survey, which involves looking at the ground from above. It is usually easier to see cropmarks and earthworks when they are viewed from above. Aerial photographs help archaeologists to record what they see and to identify new sites. There are two kinds of aerial photographs; oblique and vertical.
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FEATURE *
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Areas of indeterminate function.
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ENCLOSURE *
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An area of land enclosed by a boundary ditch, bank, wall, palisade or other similar barrier. Use specific type where known.
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SQUARE *
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An open space or area, usually square in plan, in a town or city, enclosed by residential and/or commercial buildings, frequently containing a garden or laid out with trees.
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RADIO STATION *
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A building or group of buildings containing equipment capable of transmitting and receiving radio signals. Use BROADCASTING RADIO STATION for broadcasting establishments e.g. BBC Radio stations.
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* Copyright of English Heritage (1999)
