http://data.bgs.ac.uk/ref/Geochronology
BGS Geochronology and Chronostratigraphy
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/Division
BGS Geological Time Divisions e.g. Jurassic , Cambrian or Palaeozoic
http://data.bgs.ac.uk/ref/EarthMaterialClass
The BGS Rock Classification Scheme; classifies all types of earth material or other substance that may be recorded in a geological log or section.
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/RockName
Rock Name Classes e.g. Metamorphic carbonate sediments and meta-carbonate sedimentary rocks or Phosphatic metasediments and metaphosphorites
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/RockComposite
Rock Composite Classes e.g. Andesite and basaltic andesite or Amphibolite, hornblende-schist and metagabbro
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/RockDummy
Rock Dummy Classes : Classify matter or absence of matter, other than earth material e.g. Water , Open hole or Void
http://data.bgs.ac.uk/ref/Lexicon
BGS Lexicon of Named Rock Units
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/NamedRockUnit
A BGS Rock Unit e.g. Helm Member , Ten Feet Coal (Ingleton) or Two Feet Six Coal (South Wales)
http://data.bgs.ac.uk/ref/625KGeologyMap
BGS 1:625,000 Digital Geological Map (DigMapGB)
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/Unit
1:625,000 Bedrock Units e.g. bgsn_digmap20111213000012743_625k
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/Fault
1:625,000 Faultse.g. bgsn_digmap20111213000010005_625k
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/Dyke
1:625,000 Dykes e.g. bgsn_digmap20111213000023987_625k