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. Introduction  . Purpose of study  . Regional setting  . Physiography  . Structural geology  . Rocks  . Nature of Cambrian and Ordovician outcrops and subsurface data  . Previous work  . Present work  . Initial office work  . Fieldwork  . Laboratory work  . Compilation  . Acknowledgments  . Rock-stratigraphic units  . Precambrian rocks  . Character and distribution  . Relief at the top of the Precambrian  . Cambrian and Lower Ordovician rock units  . Western part of study region  . Bolsa Quartzite  . Abrigo Formation  . Lower member  . Middle member  . Upper sandy member  . Copper Queen Member  . El Paso Limestone  . Eastern part of study region  . Bliss Sandstone  . El Paso Group  . Previous nomenclature  . Nomenclature used in this report.  . Hitt Canyon Formation  . McKelligon Limestone  . Padre Formation  . Central part of study region  . Coronado Sandstone  . El Paso Limestone  . Page

Cambrian and Ordovician rocks of southern Arizona and New Mexico and westernmost Texas