Main image on top: A view towards the Morven from upper Glen Loth (Credit: HighlandBrochs.com / AdobeStock)

Definition: Gently undulating land surfaces cut indiscriminately across underlying geology – the end-product of a long period of erosion.

A view of the hills of southern Caithness. The Niveau Pliocene dominates the foreground. The chain of inselbergs represents the refashioned sub-Devonian surface.

Image by Alan Moar

Alain Godard (1965) recognises four cross-cutting erosion surfaces in Caithness:

  • sub-Devonian surfaces
  • the Surfaces intermédiaire and écossaise of mid-Tertiary age
  • the late Tertiary “Niveau Pliocene”, dominating the plain of Caithness.

These surfaces form the main relief elements in the county and remain recognisable despite variable amounts of glacial erosion. Each reflects millions of years of erosion and each has been uplifted and deformed since its formation.

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