Site Event/Activity record ENT5250 - Borehole Survey at The Grange, Hawton

Location

Location Proposed Fox Covert Wind Farm, The Grange, Hawton, Nottinghamshire
Grid reference Centred SK 79114 49282 (1036m by 2293m)
Map sheet SK74NE
District Newark
Civil Parish Hawton, Newark

Technique(s)

Organisation

University of Leicester Archaeological Services

Date

Not recorded.

Loading documents & images

Map

Description

A series of boreholes were sunk at the centre of each proposed wind turbine site at Fox Covert, Hawton, as part of the archaeological evaluation of the site. The Written Scheme of Investigation required boreholes to be sunk to a depth of 5m at each of the four wind turbine sites to establish whether any ‘sequences of organic clays or peats with palaeoenvironmental potential’ survived at these sites. The depth of the boreholes was subsequently reduced to 2 - 3m in agreement with the Senior Practitioner for Archaeology for Nottinghamshire County Council. The boreholes were sunk using a Dando Terrier rig, and a series of one metre cores of 94mm diameter collected in sleeved plastic tubes from each borehole. The four turbine sites lie on the eastern side of the floodplain of the River Devon, just south of Hawton village. The sites of Turbines 1 and 2 are recorded as lying on alluvial sediments of clay, silt, sand and gravel, overlying Branscombe mudstone of Triassic age (BGS 2012). The superficial deposits beneath proposed Turbines 3 and 4 are not recorded by the British Geological Survey, but the underlying geology is also Branscombe mudstone. The mudstone deposits are of considerable depth and it was deemed unnecessary to core further once the mudstone was proven in a borehole. Field observation of the local topography suggested that Turbines T3 and T4 were situated at too high a level for any palaeochannels, although it did suggest that a palaeochannel probably existed along the field margin at the base of the field with Turbine 4. The boreholes at Turbine sites T1 and T2 were slightly lower and potentially on the edge of the modern floodplain of the River Devon. At the location of proposed Turbines T3 and T4 the modern ploughsoil lies directly over the mudstone with no superficial sediments other than those incorporated into the ploughsoil. At Turbine 4 the upper part of the sequence is disturbed by the cut and backfill of the trench excavated for the land drain which directly overlies the mudstone, gleyed at this location because of the water travelling through the land drain. Both these boreholes lie 0.5m or more above the boreholes at Turbines T1 and T2 and show little or no evidence for fluvial deposition. At Turbines T1 and T2 a sequence of fluvio-glacial sands and gravels lies on top of the mudstone, which are capped by alluvial clays and clayey sands and then the modern ploughsoil. There is no evidence in either sequence of recent alluviation from overbank flooding of the River Devon, and it seems probable that the river never or very rarely floods to this level, 12.8m OD. The alluvial clays recorded below the ploughsoil probably derive from late glacial times. All the turbine sites appear to be located above the postglacial floodplain of the river. None of the sediments recorded in any of the boreholes have any palaeoenvironmental potential, and no palaeochannel deposits were present. Probable late glacial clays, sands and gravels occur at Turbines T1 and T2, but have little or no further archaeological potential. No palaeoenvironmental study of the fluvial deposits beneath the turbine sites is recommended.

Sources/Archives (1)

  • --- Unpublished document: Wayne Jarvis. 2012. An Archaeological Evaluation at the Proposed Fox Covert Wind Farm, The Grange, Hawton, Nottinghamshire.

Related Monuments/Buildings (0)

Record last edited

Feb 3 2025 12:05PM

Comments and Feedback

Do you have any questions or more information about this record? Please feel free to comment below with your name and email address. All comments are submitted to the website maintainers for moderation, and we aim to respond/publish as soon as possible. Comments, questions and answers that may be helpful to other users will be retained and displayed along with the name you supply. The email address you supply will never be displayed or shared.

Be the first to comment!