Table DR-1. Representative geologic studies in the Sierra Madre Occidental

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1 DR

2 Data repository of Aguirre-Díaz, G.J. and Labarthe-Hernández, G. Fissure-source origin for voluminous ignimbrites of the Sierra Madre Occidental and its relationship with Basin and Range faulting Table DR-1. Representative geologic studies in the Sierra Madre Occidental Chihuahua- Hermosillo transect: Alba and Chavez, 1974 Bagby et al., 1981 Bockoven, 1981 Cameron and Cameron, 1986 Cameron et al., 1980 Capps, 1981 Cárdenas, 1983 Clark et al., 1980 Clark et al., 1982 Cochemé, J.J. and Demant, 1991 (8) Duex, 1983 Goodell, 1981 Henry and Price, 1984 (1) Keller et al., 1982 Mauger, 1981 Mauger, 1983a Mauger, 1983b Mauger, 1983c Mauger and Dayvault, 1983 (4) McDowell and Mauger, 1994 McDowell et al., 1989 McDowell et al., 1999 McDowell et al., 2001 Megaw, 1981 (2) Megaw and McDowell, 1983 Mora-Alvarez and McDowell, 2000 Roldán-Quintana, 2002 Schafiqullah et al., 1980 Spruill, 1976 Stimac and Wark, 1983 Swanson and McDowell, 1984 (3,4,5,6,7) Swanson and McDowell, 1985 (5,6) Valencia-Moreno et al., 2001 Wark et al., 1990 (6) Durango-Mazatlán transect: Aranda-Gómez et al., 1997 Aranda-Gómez et al., 2000 Clark et al., 1980 Clark et al, 1982 Damon et al., 1981 Henry and Fredrikson, 1987 McDowell and Keizer, 1977 McDowell and Clabaugh, 1979 (9,10) Nemeth, 1976 Schafiqullah et al., 1980 Swanson and McDowell, 1984 (9,10,11) Swanson et al., 1978 (9) Valencia-Moreno et al., 2001 Nazas-El Rodeo area: Aguirre-Díaz and McDowell, 1991 Aguirre-Díaz and McDowell, 1993 Clark et al., 1980 Clemons and McLeroy, 1966 Damon et al., 1981 Enciso-De La Vega, 1963 Luhr et al., 2001 McLeroy and Clemons, 1965 Pantoja-Alor, J., 1963 Pantoja-Alor et al., 1967 Reyes-Cortés, 1985 Roldán-Quintana, 1968 Schafiqullah et al., 1980 Zacatecas-Tepic transect: Aguirre-Díaz et al., 1997 (12) Clark et al., 1980 Clark et al., 1981 Clark et al., 1982 Damon and Nieto- Obregón, 1979 Damon et al., 1981 Lyons, 1988 Nieto-Obregón et al., 1981 Nieto-Samaniego et al., 1998 Schafiqullah et al., 1980 Scheubel et al., 1988 Valencia-Moreno et al., 2001 Webber et al., 1994 (13,14) Guanajuato area: Aranda-Gómez and McDowell, 1998 Aranda-Gómez et al., 2003 (15) Aranda-Gómez et al., 2000 Ban et al., 1994 Cerca-Martínez et al., 2000 Echegoyén, 1970 Edwards, 1955 Gross, 1975 Martínez-Reyes, 1992 Nieto-Samaniego et al., 1996 Quintero-Legorreta, 1992 Randall et al., 1994 (15) Zimmermann et al., 1990 San Luis Potosí area: Aguillón-Robles et al., 1996 Labarthe-H. and De La Huerta-C., 1998 Labarthe-H. and Jiménez-López, 1992 Labarthe-H. and Jiménez-López, 1993 Labarthe-H. and Tristán-G., 1998 Labarthe-H. and Tristán-G., 1980a Labarthe-H. and Tristán-G., 1980b Labarthe et al., 1982 Nieto-Samaniego et al., 1998 Tristán-G., 1986 Tristán-G. and Labarthe-H., 1979 Superscript numbers refer to calderas shown in Figure 1 of article.

3 References cited in Table DR-1 Alba, L. A. and Chavez, R., 1974, K-Ar ages of volcanic rocks from central Sierra Peña Blanca, Chihuahua, Mexico: Isochron West, v. 10, p Aguillón-Robles, A., Rodríguez-Ríos, R., Leroy, J.L., Aranda-Gómez, J.J., and Marín-Solís, J.D., 1996, Geología y Características del Centro Volcánico de Pinos, Zac: Instituto Nacional de Geoquímica, A.C., México, Actas INAGEQ, v. 2, No. 1, p Aguirre-Díaz, G.J. and McDowell, F.W., 1991, The volcanic section at Nazas, Durango, Mexico, and the possibility of widespread Eocene volcanism within the Sierra Madre Occidental: Journal of Geophysical Research, v. 96, p. 13,373-13,388. Aguirre-Díaz, G. J. and McDowell, F.W., 1993, Nature and Timing of faulting and syn-extensional magmatism in the southern Basin and Range, central-eastern Durango, Mexico: Bulletin of the Geological Society of America, v..105, p Aguirre-Díaz, G.J., Ferrari, L., Rosas-Elguera, J., Urrutia-Fucugauchi, J.,1997, The Sierra Madre Occidental Southern Transect. B&R grabens and a new caldera. General Assembly IAVCEI, Puerto Vallarta Abstracts volume, p. 13. Aranda-Gómez, J. J. and McDowell, F. W., 1998, Paleogene extension in the southern Basin and Range province of México: Syndepositional tilting of Eocene red beds and Oligocene volcanic rocks in the Guanajuato Mining District: International Geology Review, v. 40, p Aranda-Gómez, J.J., Godchaux, M.M., Aguirre-Díaz, G.J., Bonnichsen, B., and Martínez-Reyes, J., 2003, Three superimposed volcanic arcs in the southern Cordillera -From the early Cretaceous to the Miocene, Guanajuato, Mexico: in Geologic transects across Cordilleran Mexico, Guidebook for field trips of the 99th Annual Meeting of the Cordilleran Section of the Geological Society of America, Mexico, D.F., April 5-8, 2003, Universidad Nacional Autónoma de México, Instituto de Geología, Publicación Especial 1, Field trip 6, p Aranda-Gómez, J.J., Henry, C.D., Luhr, J.F., and McDowell, F.W., 1997, Cenozoic volcanism and tectonics in NW Mexico a transect across the Sierra Madre Occidental volcanic field and observations on extension-related magmatism in the southern Basin and Range and Gulf of California tectonic provinces, in Aguirre-Díaz, G.J., Aranda-Gómez, J.J., Carrasco-Núñez, G., Ferrari, L., eds., Magmatism and Tectonics of central and northwestern Mexico - A selection of the 1997 IAVCEI General Assemply excursions: México, D.F., Universidad Nacional Autónoma de México, Instituto de Geología, Excursión 11, p

4 Aranda-Gómez, J.J., Henry, C.D., and Luhr, J.F., 2000, Evolución tectonomagmática post-paleocénica de la Sierra Madre Occidental y de la porción meridional de la provincia tectónica de Cuencas y Sierras, Mexico: Boletín de la Sociedad Geológica Mexicana, v. LIII, p Ban, M., Hasenaka, T., Delgado-Granados, H., and Takaoka, N., 1994, K-Ar ages of lavas from shield volcanoes in the Michoacán-Guanajuato Volcanic Field: Geofísica Internacional, vol. 3, p Bagby, W. C., Cameron, K. L., and Cameron, M., 1981, Contrasting evolution of calc-alkalic volcanic and plutonic rocks of western Chihuahua, Mexico: J. Geophys. Res., v. 86, p Bockoven, N. T., 1981, Tertiary stratigraphy of the Sierra Del Gallego area of Chihuahua with comparisons to the Peña Blanca uranium district: in Uranium in volcanic and volcaniclastic rocks, Goodell, P.C. and Waters, A.C., eds., AAPG Studies in Geology No. 13, p Cameron, K.L. and Cameron, M., 1986, Geochemistry of quartz-normative igneous rocks from the Chinati Mountains and Terlingua areas, west Texas: A comparison with Cenozoic volcanic rocks from Chihuahua and Baja California Sur, Mexico: in Igneous geology of Trans-Pecos Texas, Price, J. G., Henry, C. D., Parker, D. F., and Barker, D.S., eds., Univ. Texas, Austin, Bureau of Economic Geology, Guidebook 23, p Cameron, K.L., Cameron, M., Bagby, W., Moll, J. E., and Drake, R., 1980, Petrologic characteristics of mid-tertiary volcanic suites, Chihuahua, Mexico: Geology, v. 8, p Capps, R.C., 1981, Geology of the Rancho El Papalote area, Chihuahua, Mexico: in Uranium in volcanic and volcaniclastic rocks, Goodell, P.C. and Waters, A.C., eds., AAPG Studies in Geology No. 13, p Cárdenas, D. F., 1983, Volcanic stratigraphy and uranium deposits of central Sierra Peña Blanca, Chihuahua, Mexico: in Geology and mineral resources of north-central Chihuahua, Clark, K.F. and Goodell, P.C. eds., El Paso Geological Society Guidebook, 1983 Field Conference, p Cerca-Martínez, M., Aguirre-Díaz, G.J., López-Martínez, M., 2000, The geologic evolution of southern Sierra de Guanajuato, Mexico: A documented example of the transition from the Sierra Madre Occidental to the Mexican Volcanic Belt. International Geology Review, Vol. 12 (2): Clark, K.F., Damon, P.F., Schutter, S.R., and Shaffiqullah, M., 1980, Magmatismo en el norte de México en relación a los yacimientos metalíferos: Geomimet No. 106, p Clark, K.F., Damon, P.E., Shafiqullah, M., Ponce S., B.J., Cárdenas F., D., 1981, Sección geológicaestructural a traves de la parte sur de la Sierra Madre Occidental, entre Fresnillo y la costa de Nayarit: Asociación de Ingenieros de Minas Metalurgistas y Geólogos de México, Memoria, XIV Convención Nacional, p Clark, K.F., Foster, C.T., and Damon, P.E., 1982, Cenozoic mineral deposits and subduction-related magmatic arcs in Mexico: Geol. Soc. Amer. Bull. v. 93, p

5 Clemons, R.E. and McLeroy, D.F., 1966, Resumen de la geología de la Hoja Torreón: Univ. Nal. Aut. Mex., Instituto de Geología, Carta Geológica de México, Hoja Torreón 13R-1 (1), 1: Cochemé, J.J., and Demant, A., 1991, Geology of the Yécora area, northern Sierra Madre Occidental, Mexico, in Pérez-Segura, E., and Jacques-Ayala, C., eds., Studies of Sonoran geology: Geol. Soc. Amer. Special Paper 254, p Damon, P.E. and Nieto-Obregón, J., 1979, Un plegamiento neogénico en Nayarit y Jalisco, y evolución geomórfica del Rio Grande de Santiago. Reporte en progreso. Asociación de Ingenieros de Minas Metalurgistas y Geólogos de México, Memoria, XII Convención Nacional, p Damon, P.E., Shafiqullah, M., and Clark, K.F., 1981, Age trends of igneous activity in relation to metallogenesis in the southern Cordillera: in Relations of tectonics to ore deposits in the southern Cordillera, Arizona Geol. Soc. Digest, v. 14, p Duex, T.W., 1983, Geology of the Cuauhtemoc area, central Chihuahua, Mexico, in Geology and mineral resources of north-central Chihuahua, Clark, K.F. and Goodell, P.C. eds., El Paso Geological Society Guidebook, 1983 Field Conference, p Echegoyén, J., Romero-Martínez, S., and Velázquez-Silva, S., 1970, Geología y yacimientos minerales de la parte central del distrito minero de Guanajuato: Boletín Consejo de Recursos Minerales no Renovables, v. 75, 35 p. Edwards, D. J., 1955, Studies of some early Tertiary red conglomerates of central Mexico: U.S.Geol. Survey, Professional Paper 264-H, p Enciso-De La Vega, S., 1963, Resumen de la geología de la Hoja Nazas, estado de Durango: Univ. Nal. Aut. Mex., Instituto de Geología, Carta Geológica de México, Hoja Nazas 13-k (6), 1: Gastil, R. G., Krummenacher, D., and Jensky, W.E., 1979, Reconnaissance geology of west-central Nayarit, Mexico: Geological Society of America, Text to accompany Map and Chart Series Map MC-24, 8 p. Goodell, P.C., 1981, Geology of the Peña Blanca uranium deposits, Chihuahua, Mexico: in Uranium in volcanic and volcaniclastic rocks, Goodell, P.C. and Waters, A.C., eds., AAPG Studies in Geology No. 13, p Gross, W.H., 1975, New ore discovery and source of silver-gold veins, Guanajuato, Mexico, Economic Geology, v.70, p Henry, C. D. and Fredrikson, G., 1987, Geology of part of southern Sinaloa, Mexico adjacent to the Gulf of California, Geol. Soc. Am. Map and Chart Ser., MCH063, 14 p. Henry, C.D. and Price, J.G., 1984, Variations in caldera development in the Tertiary volcanic field of Trans- Pecos, Texas: Journal of Geophysical Research, v. 89, p Keller,P.C., Bockoven, N.T., and McDowell, F.W., 1982, Tertiary volcanic history of the Sierra del Gallego area, Chihuahua, Mexico: Geol. Soc. Amer. Bull., v. 93, p

6 Labarthe-Hernández, G. and De la Huerta-Cobos, M.A., 1998, Geología del semi-graben de Bledos, San Luis Potosí, México, Esc: 1:20,000: Universidad Autónoma de San Luis Potosí, Instituto de Geología, Folleto Técnico No. 124, 33 p. Labarthe-Hernández, G. and Jiménez-López, L.S., 1992, Características físicas y estructura de lavas e ignimbritas riolíticas en la Sierra de San Miguelito, S.L.P: Universidad Autónoma de San Luis Potosí, Instituto de Geología, Folleto Técnico No. 114, 31 p. Labarthe-Hernández, G. and Jiménez-López, L.S., 1993, Geología del domo Cerro Grande, Sierra de San Miguelito, S.L.P.: Universidad Autónoma de San Luis Potosí, Instituto de Geología Folleto Técnico No. 117, 22 p. Labarthe-Hernández, G. and Tristán-González, M., 1978, Cartografía geológica Hoja San Luis Potosí: Universidad Autónoma de San Luis Potosí, Instituto de Geología y Metalurgia, Folleto Técnico No. 69, 41 p. Labarthe-Hernández, G. and Tristán-González, M., 1980a, Cartografía Geológica, Hoja Santa María del Río, S.L.P.: Universidad Autónoma de San Luis Potosí, Instituto de Geología y Metalurgia, Folleto Técnico No. 67, 32 p. Labarthe-Hernández, G. and Tristán-González, M., 1980b, Cartografía Geológica Hoja San Francisco, S.L.P.: Universidad Autónoma de San Luis Potosí, Instituto de Geología y Metalurgia, Folleto Técnico No. 69, 28 p. Labarthe-Hernández, G., Tristán-González, M., and Aranda-Gómez, J. J., 1982, Revisión estratigráfica del Cenozoico de la parte central del estado de San Luis Potosí: Instituto de Geología y Metalurgía de la Universidad de San Luis Potosí, México, Folleto Técnico No. 85, 208 p. Luhr, J.F., Henry, C.D., Housh, T.B., Aranda-Gómez, J.J., McIntosh, W.C., 2001, Early extension and associated mafic alkalic volcanism from the southern Basin and Range province: Geology and petrology of the Rodeo and Nazas volcanic fields, Durango, Mexico: Geol. Soc. Amer. Bull., v. 113, p Lyons, J.I., 1988, Geology and ore deposits of the Bolaños silver district, Jalisco, Mexico: Economic Geology, vol. 83, p Martínez-Reyes, J., 1992, Mapa geológico de la Sierra de Guanajuato con resumen de la geología de la Sierra de Guanajuato: Universidad Nacional Autónoma de México, Instituto de Geología, Cartas geológicas y mineras 8, escala 1:100,000. Mauger, R.L.,1981, Geology and petrology of the central part of the Calera-Del Nido block, Chihuahua, Mexico: in Uranium in volcanic and volcaniclastic rocks, Goodell, P.C. and Waters, A.C., eds., AAPG Studies in Geology No. 13, p

7 Mauger, R.L., 1983a, The geology and volcanic stratigraphy of the Sierra Sacramento block near Chihuahua City, Chihuahua, Mexico: in Geology and mineral resources of north-central Chihuahua, Clark, K.F. and Goodell, P.C., eds., El Paso Geological Society Guidebook, 1983 Field Conference, p Mauger, R.L., 1983b, Geologic map of the Majalca-Punta De Agua area, central Chihuahua, Mexico, in Geology and mineral resources of north-central Chihuahua, Clark, K.F. and Goodell, P.C., eds., El Paso Geological Society Guidebook, 1983 Field Conference, p Mauger, R.L., 1983c, A geologic study of the Providencia-El Nido area, northeast flank of SIerra El Nido, central Chihuahua, Mexico: in Geology and mineral resources of north-central Chihuahua, Clark, K.F. and Goodell, P.C., eds., El Paso Geological Society Guidebook, 1983 Field Conference, p Mauger, R. L. and Dayvault, R. D., 1983, The Tertiary volcanic rocks in lower Santa Clara canyon, central Chihuahua, Mexico: in Geology and Mineral Resources of North-Central Chihuahua, edited by K. F. Clark and P. C. Goodell, pp , El Paso Geological Society, El Paso, Tex. McDowell, F. W. and Clabaugh, S. E., 1979, Ignimbrites of the Sierra Madre Occidental and their relation to the tectonic history of western Mexico: in Ash-Flow Tuffs, edited by C. E. Chapin and W. E. Elston, Spec. Pap. Geol. Soc. Am., vol. 180, p McDowell, F. W. and Keizer, R. P., 1977, Timing of mid-tertiary volcanism in the Sierra Madre Occidental between Durango city and Mazatlán, Mexico: Geol. Soc. Am. Bull., vol. 88, p McDowell, F. W. and Mauger, R.L., 1994, K-Ar and U-Pb zircon chronology of Late Cretaceous and Tertiary magmatism in central Chihuahua state, Mexico: Geol. Soc. Amer. Bull., vol. 106, p McDowell, F.W., Housh, T.B., and Wark, D.A., 1999, Nature of the crust beneath west-central Chihuahua, Mexico, based upon Sr, Nd, and Pb isotopic compositions at the Tomóchic volcanic center: Geol. Soc. Amer. Bull., vol. 111, p McDowell, F. W., Mauger, R. L. and Walker, N. W., 1989, Geochronology of Cretaceous-Tertiary magmatic activity in central Chihuahua, Mexico, Continental Magmatism: Bull. New Mexico Bur. Mines Miner. Resour., 131, 181. McDowell, F.W., Roldán-Quintana, J., and Connelly, J. N., 2001, Duration of Late Cretaceous-Early Tertiary magmatism in east-central Sonora, Mexico: Geol. Soc. Amer. Bull., vol. 113, p McLeroy, D.F. and Clemons, R.E., 1965, Resumen de la geología de la Hoja Pedriceñas, estados de Durango y Coahuila: Univ. Nal. Aut. Mex., Instituto de Geología, Carta Geológica de México, Hoja Pedriceñas 13R-1 (4), 1: Megaw, P. K. M., 1981, Volcanic rocks of the Sierra Pastorias caldera area, Chihuahua, Mexico, in Volcanic and Volcaniclastic Rocks, edited by P. C. Goodell and A. C. Waters, AAPG Stud. Geol., vol. 13, p

8 Megaw, P. K. M., and McDowell, F. W., 1983, Geology and geochronology of volcanic rocks of the Sierra Pastorias area, Chihuahua, Mexico: in Geology and Mineral Resources of North-Central Chihuahua, edited by K. F. Clark and P. C. Goodell, El Paso Geological Society Guidebook, El Paso, Texas, p Mora-Álvarez, G. and McDowell, F.W., 2000, Miocene volcanism during late subduction and early rifting in the Sierra Santa Ursula of western Sonora, Mexico. In Delgado-Granados, H., Stock, J., Aguirre- Díaz, G.J., eds., "Cenozoic Tectonics and Volcanism of Mexico", Geological Society of America Special Paper 334, p Nemeth, K. E., 1976, Petrography of the lower volcanic group Tayoltita-San Dimas district, Durango, Mexico, M.A. thesis, Univ. of Tex. at Austin, 141 p. Nieto-Obregón, J., Delgado-Argote, L.A:, Damon, P. E., 1981, Relaciones petrológicas y geocronológicas del magmatismo de la Sierra Madre Occidental y el Eje Neovolcánico en Nayarit, Jalisco y Zacatecas: Asociación de Ingenieros de Minas Metalurgistas y Geólogos de México, Memoria, XIV Convención Nacional, p Nieto-Samaniego A. F., Ferrari, L., Alaniz-Alvarez, S. A., Labarthe-Hernández, G., and Rosas-Elguera, J., 1998, Variation of Cenozoic extension and volcanism across the southern Sierra Madre Occidental volcanic province, México: Geolological Society of America Bulletin, v. 111, p Nieto-Samaniego, A.F., Macías-Romo, C., and Alaniz-Alvarez, S.A., 1996, Nuevas edades isotópicas de la cubierta volcánica cenozoica de la parte meridional de la Mesa Central, México: Universidad Nacional Autónoma de México, Instituto de Geología, Revista Mexicana de Ciencias Geológicas, v. 13, núm. 1, p Quintero-Legorreta, O., 1992, Geología de la Región de Comanja, estados de Guanajuato y Jalisco: Universidad Nacional de México, Instituto de Geología, Revista, v. 10, núm. 1, p Pantoja-Alor, J., 1963, Hoja San Pedro del Gallo. Resumen de la geología de la Hoja San Pedro del Gallo, estado de Durango: Univ. Nal. Aut. Mex., Instituto de Geología, Carta Geológica de México, Hoja San Pedro del Gallo 13R-k (3), 1: Pantoja-Alor, J., Orta-Rincón, C., Solorio, J. G. and Fries, C. Jr., 1967, Edad de tres rocas intrusivas de la parte centro-septentrional de México, Bol. Inst. Geol. Univ. Nac. Aut. Méx., 82, Randall, J.A., Saldaña, E. and Clark, K.F., 1994, Exploration in a Volcano-Plutonic Center at Guanajuato, Mexico, Econ. Geol., v. 89, p Reyes-Cortés, I. A., 1985, Geology and uraniferous mineralization in the Sierra de Coneto, Durango, Mexico [M.A. thesis]: El Paso, Univ. Texas, 245 p. Roldán-Quintana, J.S:F:, 1968, Estudio geológico de reconocimiento de la región de Peñón Blanco, Estado de Durango: Boletín Sociedad Geológica Mexicana, v. 31, p

9 Roldán-Quintana, J.S.F., 2002, Caracterización geológico-geoquímica y evolución del arco magmático Mesozoico-Terciario entre San Carlos y Maycoba, sur de Sonora: Tesis Doctoral, Universidad Nacional Autónoma de México, Instituto de Geología, Posgrado en Ciencias de la Tierra, México, D.F., 185 p. Scheubel, F.R., Clark, K.F., and Porter, E.W:, 1988, Geology, tectonic environment, and structural controls in the San Martín de Bolaños district, Jalisco, Mexico: Economic Geology, vol. 83, p Shafiqullah, M., Damon, P.E., Lynch, D.J., Reynolds, S.J., Rehrig, W.A., and Raymond, R.H., 1980, K-Ar geochronology and geologic history of southwestern Arizona and adjacent areas: in Studies in western Arizona, Jenney, J.P. and Stone, C., eds., Arizona Geol. Soc. Digest, v. 12, p Spruill, R.K., 1976, The volcanic geology of the Rancho Peñas Azules area, Chihuahua, Mexico [M.S. thesis]: Greenville, North Carolina, East Carolina Univ., 99 p. Stimac, J. and Wark, D.A., 1983, Geology of the Cusihuiriachic-Buenos Aires area, Chihuahua, Mexico: in Geology and mineral resources of north-central Chihuahua, Clark, K.F. and Goodell, P.C. eds., El Paso Geological Society Guidebook, 1983 Field Conference, p Swanson, E. R., and McDowell, F. W., 1984, Calderas of the Sierra Madre Occidental volcanic field western Mexico: J. Geophys. Res., vol. 89, p Swanson, E. R., and McDowell, F. W., 1985, Geology and geochronology of the Tomochic caldera, Chihuahua, Mexico: Geol. Soc. Amer. Bull., vol. 96, p Swanson, E. R., Keizer, R. P., Lyons, J. I. and Clabaugh, S. E., 1978, Tertiary volcanism and caldera development near Durango City, Sierra Madre Occidental, Mexico: Geol. Soc. Am. Bull., vol. 89, p Tristán-González, M., 1986, Estratigrafía y Tectónica del Graben de Villa de Reyes, en los estados de San Luis Potosí y Guanajuato, Universidad Autónoma de San Luis Potosí, Instituto de Geología y Metalurgia, Folleto Técnico No. 107, 91 p. Tristán-González, M. and Labarthe-Hernández, G., 1979, Cartografía Geológica Hoja Tepetate, S.L.P., Universidad Autónoma de San Luis Potosí, Instituto de Geología y Metalurgia, Folleto Técnico No. 66, 31 p. Valencia-Moreno, M., Ruiz, J., Barton, M.D., Patchett, J.P., Zürcher, L., Hodkinson, D.G., Roldán- Quintana, J., 2001, A chemical and isotopic study of the Laramide granitic belt of northwestern Mexico: Identification of the southern edge of the North American Precambrian basement: Geol. Soc. Amer. Bull., vol. 113, p Wark, D. A., Kempter, K. A. and McDowell, F. W., 1990, Evolution of waning subduction-related magmatism, northern Sierra Madre Occidental, Mexico: Geol. Soc. Am. Bull., vol. 102, p

10 Webber, K.L., Fernández, L.A., and Simmons, W.B., 1994, Geochemistry and mineralogy of the Eocene- Oligocene volcanic sequence, southern Sierra Madre Occidental, Juchipila, Zacatecas, Mexico: Geofísica Internacional, vol. 33, p Zimmermann, J.L., Stein, G., Lapierre, H., Vidal, R., Campa, M.F. y Monod, O., 1990, Données géochronologiques nouvelles sur les granites laramiens du centro et l ouest du Mexique (Guerrero et Guanajuato): Société Géologique de France, Reunion des Sciences de la Terre, 13, Grenoble, France, p. 127.

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