Thames Valley National Mapping Programme project
The Thames Valley
The abundant river gravel deposits are steadily being quarried and flooded resulting in loss of many of these archaeological sites. The Thames Valley has been cultivated for centuries and much of the prehistoric remains were levelled and lie beneath the later medieval ridge and furrow, only visible as cropmarks from the air. Many sites recorded from earlier aerial photographs (some taken in the 1930s) had already been destroyed by more recent quarrying.
The village of Standlake in Oxfordshire illustrates the typical archaeological remains encountered throughout the Thames Valley with extensive multiphase Iron Age or Roman settlements consisting of hut circles, enclosures, ditches, pits, field system and trackways which have remained hidden beneath medieval settlement and ridge and furrow until the mid to late 20th century with a shift from predominantly pasture to arable farming.
The survey utilised photographs dating from the 1930s to the 1990s. Because of the extensive aggregates extraction which has taken place along the length of the Thames Valley since at least the 1950s, the survey mapped numerous sites or parts of sites which had long since been destroyed, and many that have been subsequently removed since the end of the project. This is illustrated when the transcribed plots are overlain on the current map.
The archaeology of the Thames Valley
Numerous prehistoric sites identified as ritual and funerary in nature have been recorded throughout the region. There were nearly a thousand Bronze Age barrows recorded, but of particular note were the Neolithic ritual sites clustered in close proximity (within 2km) to the river and its tributaries. These included four henges and 16 cursus monuments, six of which were new to the record. Also, a total of 12 Neolithic causewayed enclosures were recorded, three of which were new discoveries.
Of particular interest were a group of sites known as Highworth Circles. These are a cluster of circular enclosures typically 40 to 95 metres in diameter, with an external bank and internal ditch and no apparent entrance. In total 41 were recorded, with many still surviving as earthworks.
This is a little understood group of monuments and there are two schools of thought concerning their likely date and function. Based on morphology it was suggested that they represented a form of hengiform enclosure of prehistoric date. However, their sheer number and general confinement within the Hundred of Highworth supported by the results of excavation has led to the suggestion that they are medieval (13th-14th century) in origin and probably related to some form of stock management.
The key findings from the project can be found in the report:
Historic Places Investigation
Also of interest...
We identify archaeological sites and landscapes using aerial photography, lidar, geophysics, earthwork analysis and excavation.
Historic England experts use airborne remote sensing methods to identify, record and monitor the condition of heritage assets
This survey was carried out across the Cotswold Hills by Gloucestershire County Council Archaeological Service to National Mapping Programme standards
An aerial survey of the archaeology of Lambourn Downs carried out using National Mapping Programme (NMP) standards.