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Weakly deformed dark gneiss with an age of 2550Ma, intruded by veins of 2000 Ma granite – both constitute the Halfway gneiss when deformed

Weakly deformed dark gneiss with an age of 2550Ma, intruded by veins of 2000 Ma granite – both constitute the Halfway gneiss when deformed

Photograph: Cees Passchier