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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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BOUNDARY DITCH *
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A ditch that indicates the limit of an area or a piece of land.
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WOOD *
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A tract of land with trees, sometimes acting as a boundary or barrier, usually smaller and less wild than a forest.
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DITCH *
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A long and narrow hollow or trench dug in the ground, often used to carry water though it may be dry for much of the year.
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FIELD BOUNDARY *
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The limit line of a field.
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FARM *
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A tract of land, often including a farmhouse and ancillary buildings, used for the purpose of cultivation and the rearing of livestock, etc. Use more specific type where known.
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RAILWAY *
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A line or track consisting of iron or steel rails, on which passenger carriages or goods wagons are moved, usually by a locomotive engine.
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* Copyright of English Heritage (1999)