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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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Imperial
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1751 AD to 1914 AD (end of the 18th century AD to the beginning of the 20th century AD)
This period comes after the Post Medieval period and before the modern period and starts with beginning of the Industrial Revolution in 1750. It includes the second part of the Hannoverian period (1714 – 1836) and the Victorian period (1837 – 1901). The Imperial period ends with the start of the First World War in 1914.
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RECTILINEAR ENCLOSURE *
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A monument consisting of an area of land enclosed by a ditch, bank, wall, palisade or similar barrier, where the barrier consists of several straight or near straight sections.
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FEATURE *
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Areas of indeterminate function.
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RECTANGULAR ENCLOSURE *
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A rectangular shaped area of land enclosed by a boundary ditch, bank, wall, palisade or similar barrier.
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INDUSTRIAL *
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This is the top term for the class. See INDUSTRIAL Class List for narrow terms.
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SEWAGE WORKS *
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A group of buildings in which local sewage is filtered and purified in large rectangular or circular tanks.
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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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TANK *
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Armoured military vehicle with its own firepower, which operates on tracks for troop mobility over rough terrain. Some may be adapted, or purpose-built, to be amphibious, and may then be double-indexed as AMPHIBIOUS VEHICLE.
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* Copyright of English Heritage (1999)
