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Oblique aerial photograph
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Oblique aerial photographs are taken at angles of less than 90 degrees to the ground. They are usually taken by a photographer through the window of an aeroplane. Oblique aerial photographs are particularly useful for identifying archaeological sites that survive as earthworks, standing monuments and cropmarks. See also vertical aerial photographs.
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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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Prehistoric
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About 500,000 BC to 42 AD
The Prehistoric period covers all the periods from the Palaeolithic to the end of the Iron Age. This is a time when people did not write anything down so there is no documentary evidence for archaeologists to look at. Instead, the archaeologists look at the material culture belonging to the people and the places where they lived for clues about their way of life.
The Prehistoric period is divided into the Early Prehistoric and Later Prehistoric. The Early Prehistoric period covers the Palaeolithic and Mesolithic periods. The Later Prehistoric period covers Neolithic, Bronze Age and Iron Age times. more ->
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Iron Age
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About 800 BC to 43 AD
The Iron Age comes after the Bronze Age and before the Roman period. It is a time when people developed the skills and knowledge to work and use iron, hence the name ‘Iron Age’ which is given to this period. Iron is a much tougher and more durable metal than bronze but it also requires more skill to make objects from it. People continued to use bronze during this period. more ->
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POOL *
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A small body of water, either natural or artificial.
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BORDER *
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A strip of ground forming a fringe to a garden. Use more specific type where known.
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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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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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RING DITCH *
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Circular or near circular ditches, usually seen as cropmarks. Use the term where the function is unknown. Ring ditches may be the remains of ploughed out round barrows, round houses, or of modern features such as searchlight emplacements.
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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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FIELD BOUNDARY *
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The limit line of a field.
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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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* Copyright of English Heritage (1999)