Little Heath Pit

Little Heath Pit
Site of Special Scientific Interest
LocationHertfordshire
Grid referenceTL017082
InterestGeological
Area0.3 hectares
Notification1986
Location mapMagic Map

Little Heath Pit is a 0.3-hectare (0.74-acre) geological Site of Special Scientific Interest at Little Heath near Potten End in Hertfordshire. It is part of the Ashridge Estate, owned by the National Trust, and the local planning authority is Dacorum Borough Council.[1][2][3] It is listed in the Geological Conservation Review.[4]

The lowest layer is gravel dating to the beginning of the Pleistocene 2.6 million years ago. At this time the North Sea covered much of south-east England and the site was in an inter-tidal area, but since then the Chiltern Hills have risen 170 metres. Above this gravel layer is sand, and then another layer of gravel laid down some 20,000 years ago. This was the height of the last ice age, when the site was cold tundra like western Siberia today.[3] According to Natural England the site is "controversial" as the new excavation shows gravel of possible marine origin rather than glacial till as previously believed.[1]

The size of the site is unclear. In April 2012 the Planning Inspectorate gave consent for the erection of fencing round the site to allow re-excavation of the site while protecting it against badger damage and protecting the public against accidentally falling into the deep pit. The size was given as 360 square metres (0.036 hectares).[5] The excavation and erection of the fence were carried out shortly afterwards.[6] However, the Natural England (NE) citation gives the area as 0.3 hectares[1] and the NE map shows a larger area of 1.2 hectares.[2]

There is access to the site from Bullbeggars Lane.

The surrounding area is wooded and covered in deep pits called locally 'dells''. These are the remains of working to extract the gravel during World War One to make sandbags of use at the front. [7]

Wikimedia Commons has media related to Little Heath Pit.

References

  1. ^ a b c "Little Heath Pit citation" (PDF). Sites of Special Scientific Interest. Natural England. Retrieved 25 February 2015.
  2. ^ a b "Map of Little Heath Pit". Sites of Special Scientific Interest. Natural England. Retrieved 25 February 2015.
  3. ^ a b Information board on the site
  4. ^ "Little Heath Pit (Quaternary of the Thames)". Joint Nature Conservation Committee. Retrieved 11 January 2016.
  5. ^ Holland, Richard (3 April 2012). "Application Ref: COM 314 Little Heath, Hertfordshire" (PDF). The Planning Inspectorate.
  6. ^ Hartley, Andrew (1 May 2012). "Condition of SSSI Units for Site LITTLE HEATH PIT". Natural England.
  7. ^ Information board placed at the site by Hertfordshire Geological Society.

51°45′48″N 0°31′40″W / 51.7633°N 0.5278°W / 51.7633; -0.5278

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