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Pressure solution cleavage. Note the narrow dark bands crossing the sandy mudstone beds. Quartz has been removed from these bands and deposited in quartz veins nearby. The more massive layers have fewer dark solution bands running across them. Ilfracombe Bay, Devon, UK.
PhotoID354

Pressure solution cleavage. Note the narrow dark bands crossing the sandy mudstone beds. Quartz has been removed from these bands and deposited in quartz veins nearby. The more massive layers have fewer dark solution bands running across them. Ilfracombe Bay, Devon, UK.
PhotoID354

Photograph: Jim Talbot

Reference: See more photos at : http://myweb.facstaff.wwu.edu/talbot/cdgeol/Localities/DevonCornwall.html