Knap Hill [Map]. Historic England 1005704.

Summary: The site of Knap Hill, a Causewayed Enclosure. It encompasses an area of circa 2.4 hectares and consists of a single circuit of sub-triangular plan, conforming to the contours of the hill and possibly incomplete on the steepest, southern side. Exceptionally compared to other enclosures, the causeways seem to correspond precisely to gaps in the bank. It is unclear if the earthworks ever formed a complete enclosure. Excavations by the Cunningtons in 1908-9 first demonstrated the causewayed nature of the earthworks, as well as recovering pottery which they felt to be Neolithic in date. Further excavations in 1961 confirmed the Cunningtons' observations. Romano British pottery and an extended inhumation probably relates to the adjacent, later earthwork enclosure. The site and its archaeological history were re-investigated as part of the RCHME project focusing on enclosure and industry in the Neolithic period in 1995. Knap Hill was also subsequently included in a research programme into the dating of the early Causewayed Enclosures of southern Britain and of Ireland. The results suggested that Knap Hill was probably constructed in the 35th century cal BC, (that is to say between 3500-4001cal BC) probably more than a century later than Windmill Hill and the West Kennet long barrow [Map]. It is unclear, however, for how long activity continued. On the basis that the ditch was left to infill naturally, that there is no sign of recutting, and because there is a scarcity of sherds and bones, a short duration, probably of well under a century and perhaps only a generation or two, is possible.

More information: (SU 12106368) Neolithic Camp (NR) Knap Hill (NAT).

A causewayed camp on Knap Hill (see plan), excavated by BH and ME Cunnington in 1908-9 and G Connah in 1961. The excavations revealed Windmill Hill sherds in the silting of the ditches, Beaker sherds on the surface of the ditches and Romano-British sherds, probably associated with the plateau enclosure (see SU 16 SW 13). Other finds nearly all from within a few feet of the bottom of the ditch include fragments of red deer antlers, a human jawbone, flint flakes and a few sarsen chips. The finds are now in [Map]. Connah concludes from his excavations that the causewayed ditches undoubtedly belong to the Windmill Hill culture and that the scarcity of the pottery and occupation material may suggest that the camp was of a defensive character and abandoned at an early stage - perhaps before completion.

Radiocarbon dating of antler fragments from the primary rubble of the ditch - 4710+- 115 BP or 2760BC. Charcoal from the upper silting of the ditch - 3790+- 130BP or 1840BC.

SU 12106365 Knap Hill causewayed camp occupies a hill top position overlooking the Pewsey Vale to the S. The causewayed bank can be traced only on the N and W sides, but accepting the natural gradient of the hill for the eastern and southern extent, then the area enclosed would have been approximately 1.7 hectares. There is a bowl barrow (see SU 16 SW 23) and some flint digging disturbance within the camp, and in the E the perimeter of the IA/RB "plateau" enclosure obscures the terminal on the causewayed bank. Resurveyed in conjunction with RCHM manuscript plan at 1:2500.

The Neolithic causwayed enclosure and associated features described by the previous authorities have been mapped at 1:10,000 scale from aerial photographs and the 1:1000 plan produced as part of the industry and Enclosure in the Neolithic Project (Event UID 923509).

Surveyed by the RCHME as part of the above project.

Knap Hill encloses an area of 2.4 hectares and consists of a single circuit of sub-triangular plan, conforming to the contours of the hill and possibly incomplete on the steepest, southern side. Exceptionally to other enclosures, the causeways seem to correspond precisely to gaps in the bank.

Two radiocarbon dates were obtained by Connah following his 1961 excavations (Table 3.3: BM-205, -208; Connah 1969). They bracket the infilling of the ditch, the sample for BM-205 coming from near the base and that for BM-208 from the topmost fill. BM-205 was measured on an antler implement which had arguably been used to dig the ditch and would have been contemporary with that event. BM-208 was measured on an unidentified bulk charcoal sample which may have included material of diverse ages, and can hence provide only a terminus post quem for its context.

Knap Hill was included in a research programme into the dating of the early Causewayed Enclosures of southern Britain and of Ireland, using chronological estimates produced by Bayesian statistical analysis of radiocarbon dates. In addition to attempting to establish a construction date and duration for the monument, the proximity of the site to Windmill Hill and to a concentration of long barrows posed the question of its chronological relation to them. Six further radiocarbon measurements were therefore obtained. A model which incorporates this interpretation of the archaeological sequence with the radiocarbon dates was constructed. The model suggested that Knap Hill was probably constructed in the 35th century cal BC, probably rather more than a century later than both Windmill Hill Causewayed Enclosure [Map] and the West Kennet long barrow [Map]. It is unclear, however, for how long activity continued at this enclosure. On the basis that the ditch was left to infill naturally and there is no sign of recutting, and because there is a scarcity of sherds and bones, a short duration, probably of well under a century and perhaps only a generation or two, is plausible.

It is a curious fact that Five Wells Chambered Tomb [Map] is, within 0.2 of a degree of longitude, north of Stonehenge [Map] - see Five Wells Chambered Tomb and Stonehenge Alignment. Moreover, this line of longitude, give or take 500m, has the highest number of Neolithic and Early Bronze Age Monuments on it when compared to other lines of longitude. North to South:

Five Wells Chambered Tomb [Map]

Long Low Barrow [Map]

Willersey Barrow [Map]

Farmington Long Barrow [Map]

Monkton Fields Long Barrow [Map]

East Kennet Long Barrow [Map]

Adam's Grave [Map]

Knap Hill [Map]

Netheravon 6 Long Barrow [Map]

Knighton Long Barrow [Map]

Larkhill Long Barrow [Map]

Amesbury Barrow 14 G1 [Map]

Normanton Barrow 151 G13 [Map]

Stonehenge.

Carbon Date. 2710BC. Late Neolithic Carbon Dates

Report: Antler fragments from primary rubble of ditch at Knap Hill [Map], Alton Priors, Wiltshire, England.

ID: 4142, C14 ID: BM-205 Date BP: 4710 +/- 115, Start Date BP: 4595, End BP: 4825

OS Letter: SU, OS East: 121, OS North: 636

Archaeologist Name: G Connah

Reference Name: Radiocarbon, 13, 1971; Antiquity, 43, 1969, 304-5; Wiltshire Archaeol Natur Hist Mag, 60, 1965, 1-23

Council for British Archaeology (2012) Archaeological Site Index to Radiocarbon Dates from Great Britain and Ireland [data-set]. York: Archaeology Data Service [distributor] https://doi.org/10.5284/1017767

Carbon Date. 1790BC. Middle Bronze Age Carbon Dates

Report: Charcoal from upper silt of ditch with sherds of longnecked Beaker at Knap Hill [Map], Alton Priors, Wiltshire, England.

ID: 4143, C14 ID: BM-208 Date BP: 3790 +/- 130, Start Date BP: 3660, End BP: 3920

OS Letter: SU, OS East: 121, OS North: 636

Archaeologist Name: G Connah

Reference Name: Radiocarbon, 13, 1971; Antiquity, 43, 1969, 304-5; Wiltshire Archaeol Natur Hist Mag, 60, 1965, 1-23

Council for British Archaeology (2012) Archaeological Site Index to Radiocarbon Dates from Great Britain and Ireland [data-set]. York: Archaeology Data Service [distributor] https://doi.org/10.5284/1017767