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abundant Arizona base Basin blaok brachiopods Brazer limestone buff Bull calcareous California Carboniferous chert cliffs Coal-measures limestones Coconino sandstone color Colorado Plateaus conglomerate correlation County Creek cross-bedded dark gray deposition Devonian Diamond Peak Diamond Peak quartzite equivalent erosion Eureka district evidence fauna feet thick fine-grained fossiliferous fossils fragments Geology Girty Goodridge formation grained Grand Canyon gray limestone gypsum Hague Hermit shale Inyo Mountains Kaibab limestone Lake Valley limestone layers light gray lime Lindgren lithologio locally Longwell Luna County Madison limestone Magdalena Manzano Group Mississippian age Muddy Mountains Nevada nodules northern Utah oolor ooour orinoid overlying Owenyo Park City pebbles Pennsylvanian Permian Phosphoria formation portion Prof quadrangle quartzite Range Redwall limestone represented rocks rooks sand sandy shale sediments siliceous southeastern Idaho Spring limestone stone stratigraphio Supai formation Survey thin beds thiokness tion Triassio U.S. Geol unconformity upper Mississippian Utah weathering Weber White Pine shale