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These are some of the oldest rocks in the Dingle Peninsula, being Silurian in date. They consist of mudstones and siltstones with some volcanic material (County Kerry)

A mudstone is a siliciclastic sedimentary rock which has a mixture of silt- and clay-sized particles (at least 1/3 of each).[1] So, a mudstone is a type of mudrock with a more varied grain size than either siltstones or claystones.

Alternatively, some sources say it is a synonym for mudrock.[2]


  1. Blatt H; Middleton G & Murray R. 1980. Origin of sedimentary rocks. 2nd ed, Prentice Hall, Englewood Cliffs, N.J. ISBN 0-13-642702-2
  2. Kearey P. The new Penguin dictionary of geology. London: Penguin Books. p176