strata folded rock fold sedimentary geology cliff stone ancient sediment coastal uk vertical geological britain pattern rugged zig zag zigzag s cornwall millook poundstock natural beach jagged erosion boulders formation recumbent chevron carboniferous killas inter-bedded sandstone shale contorted culm slant slanted free pictures free photos free images royalty free free illustrations public domain
aitoff (pixabay.com)
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