Meso-America

Salvador, Amos; Westermann, Gerd E. G.; Olóriz, Federico; Gordon, Morgann; Gursky, Hans-Jürgen

doi:10.1017/cbo9780511529375.007

Cited by 6 publications

(7 citation statements)

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“…This endemism appears coincident with local paleogeography. Block tectonics and sea level fluctuations during the Late Jurassic in northeastern Mexico caused an irregular sea floor topography and variable restrictions or subdivision of basins, coherent with observed endemism of marine invertebrates until the middle Berriasian (e.g., Salvador et al, 1993;Adatte et al, 1994Adatte et al, , 1996Goldhammer, 1999;Goldhammer and Johnston, 2001;Gasparini and Iturralde-Vinent, 2006). Hence, CPC 238 possibly invalidates the apparent endemism of Mexican marine reptiles in general.…”

Section: Ophthalmosaurusmentioning

confidence: 63%

“…Marine transgression in Mexico began during the Callovian, as evidenced by the evaporites of the Minas Viejas Fm. However, microfossils and invertebrate assemblages indicate that the Mexican Gulf remained isolated from both the European Archipelago and the Pacific, at least temporarily, until the middle Berriasian; the Florida uplift and southward movement of Yucatan were proposed as possibly forming a barrier (Salvador et al, 1993;Adatte et al, 1994Adatte et al, , 1996Goldhammer, 1999;Goldhammer and Johnston, 2001;Gasparini and Iturralde-Vinent, 2006). After almost a decade of field work and examination of collections, the Late Jurassic marine reptile assemblage of north-east Mexico confirms the conclusions drawn from microfossils and invertebrates.…”

Section: Introductionmentioning

confidence: 99%

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First record ofOphthalmosaurus(Reptilia: Ichthyosauria) from the Tithonian (Upper Jurassic) of Mexico

Buchy

2010

J. Paleontol.

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From the Middle Jurassic on, the Tethys basin opened westward; the existence of a Carribean corridor linking the European and Pacific realms now appears well supported by comparison of marine reptile assemblages (e.g., Gasparini and Fernández, 1997, 2005; Gasparini et al., 2000; Fernández and Iturralde-Vinent, 2000; Gasparini and Iturralde-Vinent, 2001, 2006; Gasparini et al., 2002). Marine transgression in Mexico began during the Callovian, as evidenced by the evaporites of the Minas Viejas Fm. However, microfossils and invertebrate assemblages indicate that the Mexican Gulf remained isolated from both the European Archipelago and the Pacific, at least temporarily, until the middle Berriasian; the Florida uplift and southward movement of Yucatan were proposed as possibly forming a barrier (Salvador et al., 1993; Adatte et al., 1994, 1996; Goldhammer, 1999; Goldhammer and Johnston, 2001; Gasparini and Iturralde-Vinent, 2006). After almost a decade of field work and examination of collections, the Late Jurassic marine reptile assemblage of north-east Mexico confirms the conclusions drawn from microfossils and invertebrates. Poorly diagnostic ichthyosaur remains, with various thalattosuchians, numerically dominate the assemblage. Sauropterygians are rare, mainly represented by large pliosaurids of unclear affinities, a few vertebrae attributed to elasmosaurids, and a unique cryptoclidid. Turtles are yet to be reported (Frey et al., 2002; Buchy et al., 2003, 2005b, 2006a–d; Buchy, 2007, 2008a, b; material currently under study).

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Section: Ophthalmosaurusmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

First record ofOphthalmosaurus(Reptilia: Ichthyosauria) from the Tithonian (Upper Jurassic) of Mexico

Buchy

2010

J. Paleontol.

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“…Estos depósitos posiblemente corresponden a la desembocadura de corrientes fluviales mayores (Reyes y Rodríguez, 1991; Barboza-Gudiño y Zavala-Monsivais, 2013). La presencia de este segundo ciclo sedimentario en la vertiente del paleo-Pacífico consiste de facies marinas de ambiente profundo (Salvador et al, 1992(Salvador et al, , 2005. De acuerdo con estas observaciones es probable que la unidad 1 (predominante volcánica), de la Formación Gran Tesoro, sea del Jurásico Inferior, mientras que la unidad 2 (predominante marina) corresponda a un depósito Triásico, pero esta hipótesis requiere datos adicionales.…”

Section: Sucesiones Del Triásico Superior Y Jurásico De Méxicounclassified

Las formaciones Gran Tesoro y Nazas: evolución de las secuencias Triásico Superior-Jurásico Inferior en México y su significado tectogenético

Antuñano¹,

García²,

Sánchez³

2014

BSGM

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507 ResumenEste artículo es una integración e interpretación de datos, cuyos objetivos consisten en redefinir formalmente a la Formación Gran Tesoro y revisar la estratigrafía de la Formación Nazas, correlacionar ambos depósitos con otras sucesiones estratigráficas situadas en similar intervalo de tiempo geológico y vincular estos depósitos a un evento geodinámico regional. La Formación Gran Tesoro es una sucesión de pizarra y filita, que conserva texturas del protolito formado por rocas ígneas, sedimentarias clásticas y carbonatadas, con olistolitos que tienen fósiles del Paleozoico, por ello se consideró que esta formación tenía esa edad. La presencia de Classopollis cf. C. classoides Pflug, Classopollis cf. C. kieseri Reyre y Micrhystridium lymensis var. lymensis Wall, revela que la Formación Gran Tesoro es un depósito Mesozoico, más joven que lo previsto anteriormente. Originalmente la Formación Gran Tesoro incluyó una facies esquistosa, pero en este trabajo se segrega al esquisto de la formación por las siguientes razones: 1) Por ser de edades diferentes, el esquisto con edad isotópica de 326 ± 26 Ma (Misisípico) y la pizarra y filita de edad Mesozoica; 2) porque sus grados de metamorfismo revelan historias geológicas diferentes; 3) las relaciones de contacto entre el esquisto y las pizarra y filita son tectónicas. En este artículo se da formalidad mnemónica apropiada al Esquisto Pescaditos y a la Formación Gran Tesoro de acuerdo al Código de Nomenclatura Estratigráfica.La Formación Nazas, en el área de Villa Juárez, Durango, presenta dos miembros con capas depositadas en ambiente continental. En el miembro inferior predominan derrames volcánicos con cuerpos hipabisales intercalados entre limolitas, mientras que el miembro superior se compone de areniscas y limolitas que descansan en discordancia angular sobre el miembro inferior. La cima de la Formación Nazas subyace en discordancia angular a la Formación La Joya, y ésta pasa a su vez en transición hacia la Formación La Gloria (Oxfordiano).Las formaciones Gran Tesoro y Nazas forman parte de una secuencia sedimentaria (strictus sensus), limitada en su cima por una discordancia angular, similar a otras secciones estratigráficas de edad Triásico Superior y Jurásico Inferior observadas en México, secciones que han sido deformadas por un evento tectónico poco estudiado; sin embargo, el análisis regional de las relaciones estratigráficas de estas secciones sedimentarias en dicho intervalo geológico, nos conduce a proponer el nombre de Tectogenia Americana, para una deformación post-paleozoica y pre-Oxfordiano, independiente del lapso temporal de las orogenias Nevadiana y Laramide, ambas más jóvenes en edad.Palabras clave: Gran Tesoro, Nazas, Triásico Superior -Jurásico Inferior, Tectogenia Americana, México. Abstract This article is an integration and interpretation of data that has the objectives to formally redefine the Gran Tesoro

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“…Outcrop localities and wells, shown by Figure 2, where Upper Jurassic marine rocks are absent will not be described; in each case Lower Cretaceous rocks are in sedimentary contact with pre-Jurassic rocks. Salvador et al (1992) cited Beauvais and Stump (1976) who described an 1,800-1,900 m thick section of marine rocks composed of interbedded arkosic to lithic sandstones, shales and calcareous shales, and tuffaceous beds at Pozo Serna. According Salvador et al (1992) the section contains a rich fauna indicating a late Oxfordian to early Kimmeridgian age; they noted that, "the rare "Pseudocadaceras," a Boreal Callovian genus, is also listed" (by Stump).…”

Section: Occurrencesmentioning

confidence: 99%

Tectonic history of the Chihuahua trough, Mexico and adjacent USA, Part II: Mesozoic and Cenozoic

Haenggi¹

2002

BSGM

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The Chihuahua trough is a right-lateral pull-apart basin that began to form ~159 to ~156 Ma (Oxfordian) during a period of relative counterclockwise rotation of the North American plate. Jurassic seas were well established by latest Oxfordian time and there was little change in basin configuration throughout the remainder of Late Jurassic, Neocomian and Aptian time. Elements of a broad zone of intersecting pre-existing northwest-trending and north-trending lineaments, along the southwest border of the North American craton, provide the fabric for development of the pullapart basin between the Diablo and Aldama platforms. During Tithonian and Neocomian time sedimentation eventually outpaced tectonic subsidence and, as an ensuing "regressive" event commenced, the eastern area of the Chihuahua trough was the locus of extensive evaporite (including halite) deposition. Near the end of Aptian time, during deposition of the Cuchillo and equivalent formations, faulting along the margins of the Chihuahua trough ceased and the seas began to transgress onto adjacent platform areas. By middle Albian time seas had advanced onto previously emergent areas and the Chihuahua trough became a site of shallow-water carbonate deposition that prevailed, with minor interruptions, until early Cenomanian time. The Ojinaga Formation (early Cenomanian -Santonian?) records a marine clastic influx into the Chihuahua trough, coeval with Upper Cretaceous clastic wedges in the Western Interior Cretaceous Seaway of the United States. Retreat of the Cretaceous sea is reflected in the transition from marine to non-marine beds in the Santonian San Carlos Formation and overlying non-marine El Picacho Formation.During the Laramide orogeny (84 to 43 Ma) the Chihuahua trough was inverted to form the Chihuahua tectonic belt. Laramide deformation is the result of left-lateral transpressional tectonics involving renewed movement along the pre-existing fabric that controlled the location of the Jurassic-Aptian basin. In the evaporite basin portion of the trough (eastern area) reactivation of basin-boundary-faults as Laramide reverse faults, with possible left-lateral components of motion, accompanied by development of gentle "ancestral" folds, was followed by amplification of folds in postevaporite rocks caused by flow of evaporites toward the crests of anticlines. As deformation progressed, structural development involved thrust faulting (principally toward the Diablo Platform) and diapiric injection of evaporites along the margins of the evaporite basin. In the northwestern area of the trough, structure reflects northeast-southwestoriented compression and includes relatively minor southwest-directed thrusting toward and onto the Jurassic Aldama platform. Paleozoic formations are involved in the thrusts and all thrusting can be interpreted as a consequence of faulted basement rather than regional-scale décollement.Post-Laramide tectonic activity includes a continuation of evaporite tectonism, scattered igneous intrusion, minor volcanism, gravity ...

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Meso-America

Cited by 6 publications

References 0 publications

First record ofOphthalmosaurus(Reptilia: Ichthyosauria) from the Tithonian (Upper Jurassic) of Mexico

First record ofOphthalmosaurus(Reptilia: Ichthyosauria) from the Tithonian (Upper Jurassic) of Mexico

Las formaciones Gran Tesoro y Nazas: evolución de las secuencias Triásico Superior-Jurásico Inferior en México y su significado tectogenético

Tectonic history of the Chihuahua trough, Mexico and adjacent USA, Part II: Mesozoic and Cenozoic

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