Lexicon

The Lexicons provide definitions of regional supergroups, groups, formations and members (name, type location, characteristic lithology, age constraints etc). Generally national institutions in respective countries have the task of maintaining such Lexicons, for the UK, the British Geological Survey maintains the Lexicon.

• British Lexicon
• Links to lexicons of Australia, Austria, Canada, Iraq, New Zealand, Pakistan, USA.
• Lexicon of Germany