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Al Introduction 2 Previous investigations 6 Methods 6 Stratigraphy 8 Precambrian crystalline and metamorphic rocks 8 Cambrian rocks 8 Ignacio Quartzite 8 Ordovician and Silurian rocks 13 Devonian rocks 15 Elbert Formation 15 McCracken Sandstone Member 15 Upper member 15 Ouray Limestone 18 Mississippian rocks 18 Leadville Limestone 18 Pennsylvanian rocks 18 Molas Formation 22 Coalbank Hill Member 22 Middle member 22 Upper member 22 Hermosa Group 23 Pinkerton Trail Formation 25 Paradox Formation and equivalent rocks 25 Honaker Trail Formation 28 Pennsylvanian and Permian rocks 28 Rico Formation 28 Page Stratigraphy Continued Permian rocks A30 Cutler Formation, undivided 30 Cutler Group 30 Halgaito Formation 30 Cedar Mesa Sandstone 33 Organ Rock Formation 33 De Chelly Sandstone 33 Triassic rocks 33 Dolores Formation 33 Jurassic rocks 39 Glen Canyon Group 39 Entrada Sandstone 39 Dewey Bridge Member 39 Slick Rock Member 42 Wanakah Formation 42 Todilto Limestone Member and equivalent rocks 42 Beclabito Member and equivalent rocks 42 Horse Mesa Member and equivalent rocks 42 Junction Creek Sandstone 45 Morrison Formation 45 Salt Wash Member 45 Recapture Member 45 Westwater Canyon Member 49 Brushy Basin Member 49 Geologic history 49 Summary 53 References cited 53

u.s. geological survey professional papers/u.s. geological survey professional paper

Geologic framework of pre-Cretaceous rocks in the Southern Ute Indian Reservation and adjacent areas, southwestern Colorado and northwestern New Mexico