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This photograph shows modified boudin structures from Wilson Bluff in the Southern Prince Charles Mountains, East Antarctica. There is an impressive flanking-fold structure situated between the torn mafic boudins, that presumably formed by ductile flow of the overlying host grey gneiss into a low-pressure sink during the boudin separation. Subsequent reworking and shortening is indicated by numerous folded boudin structures in the leucocratic pegmatite material. The timing of the structures is uncertain but the host rock is of Precambrian age. The exposure is southwest facing. PhotoID200

This photograph shows modified boudin structures from Wilson Bluff in the Southern Prince Charles Mountains, East Antarctica. There is an impressive flanking-fold structure situated between the torn mafic boudins, that presumably formed by ductile flow of the overlying host grey gneiss into a low-pressure sink during the boudin separation. Subsequent reworking and shortening is indicated by numerous folded boudin structures in the leucocratic pegmatite material. The timing of the structures is uncertain but the host rock is of Precambrian age. The exposure is southwest facing. PhotoID200

Photograph: Adrian F Corvino

Reference: This is a photograph of the Month in the Journal of Structural geology (JSG 32, 1)