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Geophysical Survey
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The measuring and recording of electrical resistivity or magnetism in order to determine the existence and outline of buried features such as walls and ditches. Geophysical techniques include resistivity survey, magnetometer survey and ground penetrating radar.
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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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Roman
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About 43 AD to 409 AD (the 1st century AD to the 5th century AD)
The Roman period comes after the Iron Age and before the Saxon period.
The Roman period in Britain began in 43 AD when a Roman commander called Aulus Plautius invaded the south coast, near Kent. There were a series of skirmishes with the native Britons, who were defeated. In the months that followed, more Roman troops arrived and slowly moved westwards and northwards.
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SITE *
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Unclassifiable site with minimal information. Specify site type wherever possible.
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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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DEFENDED ENCLOSURE *
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An enclosed area of land of varying size and shape which shows traces of defence.
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ROAD *
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A way between different places, used by horses, travellers on foot and vehicles.
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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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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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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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RED HILL *
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Iron Age or Roman coastal site producing salt by boiling of seawater in fired clay pans, resulting in characteristic mounds of 'BRIQUETAGE' (see Archaeological Objects Thesaurus).
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* Copyright of English Heritage (1999)
