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affected Alps already American Appalachians apparently Arbuckle Arbuckle phase Arch Ardmore Basin Arkansas Atoka base basement Basin become beds blocks boulders buried Caney caused central chains chert Coast complex conglomerates considerable contains continued Cretaceous deposits domes east eastern entire equivalent erosion evidence exposed extended facies farther fault feet final flysch folds foredeep foreland formation formed front frontal Geological geosyncline Gulf Hills important indicated Kansas known later less limestone lower major Marathon mass Mexico miles Mississippian movements nappe northern notably occur Oklahoma older Ordovician origin orogeny Ouachita Mountains outcrops overthrusting Paleozoic Pennsylvanian Permian phase Plateau portion possibly pre-Cambrian present probably ranges reached region represented ridges River rocks salt sandstone sediments seems sequence shale similar southeastern southern strata strike structure Tertiary Texas thickness thrust trend unconformity uplift upper Variscan western Wichita Wichita Mountains writer zone