Stylolitic cleavage and cleavage refraction in Lower Paleozoic carbonate rocks of the Great Valley, Maryland

摘要: Abstract Closely spaced stylolitic cleavage is developed in closures of folds Lower Paleozoic carbonate rocks the Great Valley, west Hagerstown, Maryland. Stylolites which are perpendicular to bedding beds relatively competent microspar refracted into a more penetrative thin layers less competent, dolomitic micrite. Cleavage refraction result shear micrite accommodated slip between by acting as Ramsay and Graham-type zones. The not normally parallel plane (bedding) but may approach parallelism extremely Refraction greywackes slates overlying Martinsburg Formation, if due mechanism proposed for rocks, incompatible with pre-lithification origin slaty cleavage.