Review of Paleozoic stratigraphy of México and its role in the Gondwana-Laurentia connections

The Grenville-age basement of the Andes

“…The Arequipa and Oaxaquia terranes share a common highgrade metamorphic basement of Grenville age and similar unique Gondwanan trilobites as described by Moya et al (1993), OrtegaGutiérrez et al (1995), Sánchez-Zavala et al (1999), which are different from the typical Laurentian fauna. Besides, the geological evolution of Oaxaquia and Arequipa presents many common events as the age of the main arc magmatism, the presence of Grenvillian anorthosites, the peak of metamorphism, the isotopic composition, and the early Paleozoic cover (Ramos, 2009;Keppie and Ortega-Gutiérrez, 2010).…”

Detrital zircon provenance of Cambrian–Ordovician and Carboniferous strata of the Oaxaca terrane, southern Mexico

“…4) (Pantoja-Alor, 1970). The lower Paleozoic strata contain faunal assemblages of Gondwanan affinity (Pantoja-Alor and Robison, 1967;Robison and Pantoja-Alor, 1968), and are interpreted as shallow marine deposits (Centeno-García et al, 1997; Flores de Dios Gonzalez et al, 1998;Sanchez-Zavala et al, 1999). The Cambrian through Pennsylvanian units are overlain unconformably by the less-deformed Yododene Formation of uncertain post-Permian to pre-Cretaceous age (McCabe et al, 1988;Ballard et al, 1989;Flores de Dios Gonzalez et al, 1998).…”

“…4). These sediments are also considered shallow marine (Centeno-García et al, 1997;Sanchez-Zavala et al, 1999), possibly deposited by low-density turbidity currents in a fan-delta system (Flores de Dios Gonzalez et al, 1998). Our sample was collected from a medium-grained sand lens near the Fig.…”

“…Strata of the Santiago Formation accumulated either in shallow marine environments(Centeno-García et al, 1997;Sanchez-Zavala et al, 1999) or in deeper basin or shelf-slope environments (Flores de Dios Gonzalez et al…”

Early Permian conifer remains from Central Mexico and reevaluation of Paleozoic conifer morphotaxa

“…Therefore, the new Mexican material, from Calnali, offers an opportunity to reevaluate and update current approaches for describing and naming Paleozoic conifer morphotaxa. Furthermore, the discovery of walchian conifers, in central Mexico, may serve to test hypothesis on the origin and accretion of Mexican terrenes and blocks at the end of the Paleozoic, as previously discussed by other authors (OrtegaGutierrez et al, 1995;Sánchez-Zavala et al, 1999;Vachard et al, 2000;Centeno-García, 2005).…”