Geology of Cambridgeshire

The geology of Cambridgeshire in eastern England largely consists of unconsolidated Quaternary sediments such as marine and estuarine alluvium and peat overlying deeply buried Jurassic and Cretaceous age sedimentary rocks.[1]

This article describes the geology of the ceremonial county of Cambridgeshire. It thus includes the present City of Peterborough and the historic county of Huntingdonshire which was brought into the county in 1974.

Jurassic

Limestones, mudstones and sandstones of the Inferior Oolite Group and Great Oolite Group dating from the early to mid Jurassic Period are present at depth beneath western Cambridgeshire. The later Kellaways and Oxford Clay formations and Ampthill Clay formations all assigned to the Ancholme Group of middle to late Jurassic times underlie much of central Cambridgeshire.

Cretaceous

Cretaceous rocks come to the surface in the east of the county and beneath Cambridge itself including the lower and upper Greensand, the Gault Formation and lastly the Chalk Group, youngest element of the local bedrock.

Quaternary

Extensive areas of older glacial till are mapped across parts of the southwest of the county, notably between Peterborough and Royston, south of Newmarket and in isolated patches around March and Ely.[2]

gollark: Putting core features into extensions brings nothing but more complex negotiations and fallbacks, and makes it a bit more annoying to depend on in other features.
gollark: … what 44 things did they do before that?
gollark: This seems like another bad thing to be in an extension.
gollark: Which can arbitrarily be(e) joined?
gollark: Is it possible to have a "channel" like IRC has?

See also

Further reading
  • British Geological Survey 1:50,000 scale geological map series sheets (England and Wales) 187, 188, 204 & 205 and accompanying memoirs.

References
  1. British Geological Survey 1:625,000 scale geological map Bedrock Geology UK South 5th Edn. NERC 2007
  2. British Geological Survey 1:625,000 scale geological map Quaternary Map of the United Kingdom South 1st Edn. 1977
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