The landslide at Fenny Bentley is located approximately 3 km north of Ashbourne in Derbyshire. As a result of this landslide, the B5056 road has become dangerous and has been closed. Movement on this section of road has been reported in local and national news for some time.
The BGS Landslide Response Team made a visit to the landslide on 13th August 2009 to investigate the failure. Information was collected for the BGS National Landslide Database and geological maps.
The geology underlying this slope is part of the Bowland Shale Formation, previously known as the Edale Shale. This is Carboniferous in age (Namurian) and belongs to the Craven Group.
The Bowland Shale Formation is composed of: mainly dark grey fissile mudstones, weakly calcareous interbedded limestones and sandstones. In discrete bands it is fossiliferous and is commonly associated with landslides throughout Derbyshire.
Alluvial deposits are present in a flattened area at the bottom of the slope associated with the Bradbourne Brook.
Fresh landslide features known as mud flows were mostly seen in the upper part of the slope, below the road. The landslide reported is actually a reactivation of part of an older and larger landslide.
The 1:10 000 scale geological map shows the extent of the older and larger landslide. This landslide has not been printed on our 1:50 000 scale geological map, as it was too small to represent cartographically at this scale.
All the information about the landslide was collected by the Landslide Response Team, using BGS·SIGMAmobile technology.