OR/13/050 Modelled surfaces/volumes: Difference between revisions

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Latest revision as of 17:55, 16 February 2017

Gow, H, Cripps, C, Thorpe, S, Horabin, C, and Lee, J R. 2013. Model metadata report for the Somerset levels 3D geological model. British Geological Survey Internal Report, OR/13/050.

Below is a list of units that have been modelled as volumes in the Somerset Levels model (BGS lexicon codes in brackets, www.bgs.ac.uk/lexicon).

Superficial deposits:

  • Alluvium (ALV)
  • Tufa (TUFA)
  • Blown sand (BSA)
  • Beach and Tidal Flats, Undifferentiated (BTFU)
  • Peat (PEAT3)
  • Head (HEAD)
  • Tidal Flat Deposits (TFD2)
  • Peat (PEAT2)
  • Tidal Flat Deposits (TFD1)
  • Peat (PEAT1)
  • Sand and Gravel (SGAO)
  • River Terrace Deposits, 1 (RTD1)
  • River Terrace Deposits, Undifferentiated (RTDU)
  • Unknown Drift (UNKND)
  • Burtle Formation (BUB)

Bedrock deposits:

  • Lias Group (LIAS)
  • Triassic Rocks — Mudstones and Siltstones (TRIAS-MDSS)
  • Triassic Rocks — Sandstones, Conglomerate (TRIAS-SCON)
  • Dinantian (DINA)
  • Upper Devonian (UDEV)

These geological units were chosen to best represent the current 1:50 000 scale superficial and 1:625 000 scale bedrock geology in the Somerset Levels basin. For the units TFD1, TFD2, PEAT1, PEAT2, PEAT3 that don’t conform to standard BGS lexicon entries, we assigned them an informal unit name and status. These units all belong to the Somerset Levels Formation as defined by McMillan et al. (2011)[1].

In some locations, sand and peat have been modelled as lenses when they could not be correlated into a particular unit, such as sand channels or small areas of peat. These units only occur within the Quaternary (superficial) succession.

References

  1. ↑ MCMILLAN, A A, HAMBLIN, R J O, and MERRITT, J W. 2011. A lithostratigraphical framework for onshore Quaternary and Neogene (Tertiary) superficial deposits of Great Britain and the Isle of Man. British Geological Survey Research Report RR/10/03.
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