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Archaean tonalitic gneiss, strongly deformed with remains of mafic dykes, cut by several sets of pegmatite and granite veins, and ductile and brittle shear zones. This outcrop is ideal for teaching structural geology in the field

Archaean tonalitic gneiss, strongly deformed with remains of mafic dykes, cut by several sets of pegmatite and granite veins, and ductile and brittle shear zones. This outcrop is ideal for teaching structural geology in the field

Photograph: Sebastian Schröder and Nils Suhr