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Glacial striations on a rockface of Cambro-Ordovician micaschist and pegmatite. This photograph was made during construction of the Soulsem dam in the 1970s. The outcrop is now largely destroyed and covered by the Soulsem dam
PhotoID581

Glacial striations on a rockface of Cambro-Ordovician micaschist and pegmatite. This photograph was made during construction of the Soulsem dam in the 1970s. The outcrop is now largely destroyed and covered by the Soulsem dam
PhotoID581

Photograph: Cees Passchier