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Linear ptygmatic folded quartz veins. Weekeroo, South Australia.
PhotoID331

Linear ptygmatic folded quartz veins. Weekeroo, South Australia.
PhotoID331

Photograph: Jim Talbot

Reference: Other photos of folds with enveloping surfaces may be seen at: http://myweb.facstaff.wwu.edu/talbot/cdgeol/Structure/Fold/Folds1/Fold_styles.html#ptygmatic