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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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BOUNDARY *
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The limit to an area as defined on a map or by a marker of some form, eg. BOUNDARY WALL. Use specific type where known.
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LINEAR FEATURE *
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A length of straight, curved or angled earthwork or cropmark of uncertain date or function.
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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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FIELD BOUNDARY *
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The limit line of a field.
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* Copyright of English Heritage (1999)
