Image above: Strath Halladale

Definition: rock hills shaped by the passage of ice to give a smooth up-ice side and a rough, plucked and cliffed surface on the down-ice side. The upstream surface is often marked with striations.

Roches moutonnées are not widely developed in Caithness. The Devonian flagstones of the plain of Caithness give smooth, ribbed slopes, without lee-side cliffs. Much of the area covered by inland ice lies in a zone of limited glacial erosion where the ice was mainly cold based. Ice-moulding tends to occur here only where ice flow was constricted, as on the flanks of Berriedale. In contrast, Strath Halladale discharged a vigorous flow of warm-based ice to the north which also influenced the north-western edge of Caithness. The basement rocks around Reay also display numerous ice-roughened hills. In its extensive development of knock and lochan landscapes, this ground resembles much of Sutherland.

Streamlined bedrock terrain around Clyth, with linear rock ridges displaying lee-side cliffs
Cnoc na Feadaige

Ice-moulded quartzite surfaces above the gorge of the Berriedale Water, downstream of Braemore

Share This Story, Choose Your Platform!