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546,196 artículos
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Año:
2019
ISSN:
2007-2902, 1026-8774
Applegate, Shelton Pleasants
Universidad Nacional Autónoma de México
Resumen
A new genus and species of pycnodont, Tepexichthys aranguthyorum gen. et sp. nov., is described from the Tlayúa quarries, near Tepexi de Rodríguez, Puebla… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Martínez-Hernández, Enrique
Universidad Nacional Autónoma de México
Resumen
The Ixtapa Formation is volcaniclastic, unit which has been dated from middle Miocene to late Miocene… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Jacques-Ayala, César
Universidad Nacional Autónoma de México
Resumen
The Lower Cretaceous Glance Conglomerate and Morita Formation are well exposed in the sierra El Chanate, about 20 km northeast of Caborca, northwestern Sonora, México… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Carranza-Castañeda, Oscar; Walton, Anne H.
Universidad Nacional Autónoma de México
Resumen
The rodent assemblage of the late Hemphillian El Ocote local in central Mexico resembles that of the Yepómera fauna of northern Mexico, but the El Ocote fauna lacks such northern genera as Copemys… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Cevallos-Ferriz, Sergio R.S.; Weber, Reinhard
Universidad Nacional Autónoma de México
Resumen
A silicified Wood collected from Maastrichtian sediments of the Olmos Formation, near Agujitas, State of Coahuila, has anatomical characteristics similar to those from the wood of the phyllantoid group (Euphorbiaceae)… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Enciso-De la Vega, Salvador
Universidad Nacional Autónoma de México
Resumen
The Cenozoic stratigraphic record of the Basin of Mexico consists of a wide variety of rocks types, ranging in age from Miocene to Quaternary. Most of them are volcanic, volcaniclastic and clastic rocks, such as lava flows, tuff, volcanic ash, lahar, lapilli deposits, lacustrine sediments, alluvium and pyroclastic rocks… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Carranza-Castañeda, Oscar
Universidad Nacional Autónoma de México
Resumen
Se describe la fauna de una localidad nueva dominada Rinconada, situada a 16 km al noreste de la ciudad de San Miguel de Allende, en el Estado de Guanajuato… Para continuar descargue el artículo completo en PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
González-León, Carlos
Universidad Nacional Autónoma de México
Resumen
A 2,500 m thick section of Lower Cretaceous sedimentary rocks from the Lampazos region, east-central Sonora, is described. It was divided, for descriptive purposes, into seven informal formations, which, from base to top, are El Aliso, Agua Salada, Lampazos, Espinazo del Diablo, Los Picachos and its equivalent Nogal and La Mesa formations. Thin to medium bedded, with minor amount of shale and fine-grained sandstone, are characteristics of the El Aliso, Lampazos, Los Picachos and the member 1 of the Nogal formations, and their depositional environment is interpreted as restricted shallow marine (according to Rose, 1978). The main lithology from the lower half of the Agua Salada formation is well bedded, wavy black radiolarian chert containing ammonites (Parahoplites sp.), while black shale with nodular and thin bedded chert predominates in its upper half. Due to the presence of Dufrenoyia justinae and Hypacanthoplites sp., a late Aptian (Gargasian) age is considered for this unit. Download full text.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Ferrusquía-Villafranca, Ismael; Comas-Rodríguez, Oscar
Universidad Nacional Autónoma de México
Resumen
The Papalutla reptiliofaunule, Neocomian of the Huajuapan de León Municipality, Oaxacan Mixteca Region, Mexico, is described; it proceeds from an unnamed formation consisting of marly silty limestone bearing fish, reptiles and ammonites; the age of the formation and of the fauna was determined on the basis of the latter fossils. The reptiliofaunule consists of Thalattosuchia Fam., Gen. et sp. indet. (Archosauria-Crocodylia), represented by three dorsal vertebrae that would be the first record of this infraorder in Middle America, as well as the oldest and southernmost record of the Order Crocodylia in Mexico, and of Gen. nov. aff. Pliosaurus sp. (Sauropterygia-Plesiosauria), represented by a toothed rostral fragment and a cervical vertebral centrum that seems to be the first certain Early Cretaceous record of the Family Pliosauridae in the American Continent, a fact in itself very significant. Dowload full text.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Vega-Vera, Francisco Javier; Mitre-Salazar, Luis Miguel; Martínez-Hernández, Enrique
Universidad Nacional Autónoma de México
Resumen
This contribution on the stratigraphy of Difunta Group in northeastern Mexico consists chiefly of a description of Paleocene and Eocene beds in the La Popa basin… In order to continue, download the full paper in PDF.
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