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Earthwork
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Earthworks can take the form of banks, ditches and mounds. They are usually created for a specific purpose. A bank, for example, might be the remains of a boundary between two or more fields. Some earthworks may be all that remains of a collapsed building, for example, the grassed-over remains of building foundations.
In the winter, when the sun is lower in the sky than during the other seasons, earthworks have larger shadows. From the air, archaeologists are able to see the patterns of the earthworks more easily. Earthworks can sometimes be confusing when viewed at ground level, but from above, the general plan is much clearer.
Archaeologists often carry out an aerial survey or an earthwork survey to help them understand the lumps and bumps they can see on the ground.
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Vertical aerial photograph
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Vertical aerial photographs are taken from immediately overhead using a camera fixed to the underside of an aeroplane. The camera points directly downwards at 90 degrees to the ground. Vertical photographs are particularly useful for identifying sites that survive as cropmarks. See also oblique aerial photographs.
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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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SITE *
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Unclassifiable site with minimal information. Specify site type wherever possible.
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INSTITUTE *
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A building in which a society or organization is instituted to promote science, art, literature, education, etc. Use more specific type where known.
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MILITARY DEPOT *
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A building or group of buildings, often enclosed by a system of fortifications, used by an armed force for the storage and distribution of military equipment.
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BOMB STORE *
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A complex of buildings and earthworks constructed for the storage of bombs and pyrotechnics.
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BUNKER *
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A structure, often built undergound, used for defence and co-ordination of military activity.
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WELL *
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A shaft or pit dug in the ground over a supply of spring-water.
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LINEAR EARTHWORK *
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A substantial bank and ditch forming a major boundary between two adjacent landholdings. Most date from the late Bronze Age and Iron Age.
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STORAGE DEPOT *
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A building or site used for the storage of goods or equipment.
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STRUCTURE *
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A construction of unknown function, either extant or implied by archaeological evidence. If known, use more specific type.
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EARTHWORK *
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A bank or mound of earth used as a rampart or fortification.
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DEPOT *
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A building or site used as a storage and distribution centre.
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* Copyright of English Heritage (1999)