Vol. 13 No. 2 (1996)

Cintura Formation - an Early Cretaceous deltaic system in northeastern Sonora, Mexico

Francisco Javier Grijalva-Noriega

129-139

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Quitovac Faultresult of a transpressive event of the Mojave-Sonora Megashear

Gerardo Caudillo-Sosa, Luis Fernando Oviedo-Lucero, José Luis Rodríguez-Castañeda

140-151

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Stratigraphic and petrologic characteristics and extinction of the Miocene andesitic belt in the Loreto-Las Parras region, Baja California Sur, Mexico

Biagio Bigioggero, Pedro Corona-Chávez, Annalisa Tunesi

152-173

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Geology of the Palo Huérfano volcano, Guanajuato, Mexico

José Antonio Pérez-Venzor, José Jorge Aranda-Gómez, Fred McDowell, José Gregorio Solorio-Munguía

174-183

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Eocene Ar40-Ar39 age data of supposed Cretaceous volcanics (Rhyolite Tuff formation) in northeastern Sonora, Mexico

Spencer G. Lucas, William C. McIntosh, Carlos Manuel González-León

184-187

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Sedimentary zeolites in the Sierra Madre del Sur and Sierra Madre Occidental, Mexico

Liberto del Pablo-Galán, María de Lourdes Chávez-García, Misael Cruz-Sánchez

188-200

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Review of Macropterygiwn Schimper ("Cycadophyta", presumed Bennettitales) and a new species from the Upper Triassic of Sonora, northwestern Mexico

Reinhard Weber

201-220

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Influence of soil management practices and substrate availability on microbial biomass and its activities in some haplic Luvisols

Jürgen K. Friedel

221-227

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Duripans in subtropical and temperate subhumid climate in the Trans-Mexico Volcanic Belt

David Flores-Román, Jorge René Alcalá-Martínez, Arelia González-Velázquez, Jorge Enrique Gama-Castro

228-239

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Geomorphology of the Sierra de Guadalupe (to the north of Mexico City) and its relation with natural risks

José Lugo-Hubp, Araceli Salinas-Montes

240-261

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Circular and linear structures in the Guanajuato minino district, Mexico, and their significance in the mining prospection

Luis F. Vassallo, Juventino Martínez-Reyes, Jean Pierre París

252-257

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FE DE ERRATAS

José Luis Rodríguez Castañeda

258-258

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Regular Papers

Erratum