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| Fig. 3.20a-d: Surface structures of joints from pelitic rocks of the Mystic River region, MA. a) Joint plane with plumose structure and fringe fracture surfaces. b) Plumose structure on fringe fracture surfaces. c) Cross section of fringe showing echelon fractures. d) Cross section of fringe with echelon fractures and cross fractures. Reproduced from (Woodworth, 1896) with permission from The Museum of Science, Boston. | ||||
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