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__ Previous work _ Present studies Page 1 1 2 3 Acknowledgments  3 Physical stratigraphy of upper Proterozoic and Cambrian rocks  5 El Arpa Formation  7 Caborca Formation. 10 Clemente Formation. 10 Pitiquito Quartzite  11 Gamuza Formation- 12 Papalote Formation  14 Tecolote Quartzite  15 La Cienega Formation  15 Puerto Blanco Formation- 15 Proveedora Quartzite  16 Page Physical stratigraphy of upper Proterozoic and Cambrian rocks Continued  17 Buelna Formation  17 Cerro Prieto Formation  17 Arrojos Formation  17 Tren Formation  17 Biostratigraphy _  17 Paleocurrent studies  22 Regional correlations  25 Southern Great Basin  25 San Bernardino Mountains  28 Sierra Agua Verde  29 Tectonic and paleogeographic setting  30 Model A. 30 Model B 31 Model C..__ 32 References cited  33

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

Upper Proterozoic and Cambrian rocks in the Caborca region, Sonora, Mexico; physical stratigraphy, biostratigraphy, paleocurrent studies, and regional relations