Glossary of geological terms

An A to Z helping you make sense of the geology of Fforest Fawr UNESCO Global Geopark

You will come across a wide variety of names for different types and ages of rock in the Geopark.  They can be confusing at times but help is at hand! Use this A to Z of geological terms to discover just what is meant by ‘Neath Disturbance’ or ‘Senni Beds’.

Most of the current and former names of rock formations, periods of geological time and other features which occur in books, leaflets and other sources are listed here.

In each case, as an aid to translation, the Welsh word or phrase is given alongside the English.

Click on a letter:

ABCDEFGHI J KL
MN OP QRSTU VW X Y Z

  • Take a look at the geological timescale for an overview of Fforest Fawr through time.
  • You may also find Wikipedia to be a useful source of further information.