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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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Modern
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The Modern Period, about 1915 AD to the present (the 20th and 21st centuries AD)
In recent years archaeologists have realised the importance of recording modern sites. They do this so that in the future people will be able to look at the remains to help them understand the events to which they are related. more ->
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modern
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About 1915 AD to the present (the 20th and 21st centuries AD)
In recent years archaeologists have realised the importance of recording modern sites. They do this so that in the future people will be able to look at the remains to help them understand the events to which they are related. more ->
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LAYER *
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An archaeological unit of soil in a horizontal plane which may seal features or be cut through by other features.
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FEATURE *
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Areas of indeterminate function.
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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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TRENCH *
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An excavation used as a means of concealment, protection or both.
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MARKER POST *
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A post, made of wood, metal or other material, erected to mark a particular spot in the landscape. Can be used for various reasons such as measurement, calibration etc.
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PIPELINE *
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A conduit or pipes, used primarily for conveying petroleum from oil wells to a refinery, or for supplying water to a town or district, etc.
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* Copyright of English Heritage (1999)