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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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SITE *
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Unclassifiable site with minimal information. Specify site type wherever possible.
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EXTRACTIVE PIT *
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Surface workings including shallow shafts, lode workings, open-pit methods and quarrying including some mines of stone, clays, compounds, etc. See also MINERAL EXTRACTION SITE.
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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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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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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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TRACKWAY *
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A pathway, not necessarily designed as such, beaten down by the feet of travellers.
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GEOLOGICAL MARKS *
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Soil marks and other features of natural origin, including periglacial frost wedging, solifluction deposits, abandoned water courses, etc, recorded to avoid future confusion with features of human origin.
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TARGET *
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Any structure or object, used for the purpose of practice shooting by aerial, seaborne or land mounted weapons.
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* Copyright of English Heritage (1999)