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546,196 artículos
Año:
2019
ISSN:
2007-2902, 1026-8774
Carreño, Ana Luisa
Universidad Nacional Autónoma de México
Resumen
By means of point sampling method in the Tampico-Misantla sub-province, the analysis of the ostracod microfauna was carried out, in order to place this fauna within a stratigraphic and paleoecological context… In order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
González-León, Carlos
Universidad Nacional Autónoma de México
Resumen
In the northern foothills of the Sierra del Alamo, northwestern Sonora, the Middle Permian (Guadalipian) Monos Formation is cropping out; it is constituted by 300 m of shale and argillaceous limestone in its lower part, and by 200 m of fossiliferous limestone in its upper part… In order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Ferrusquía-Villafranca, Ismael; Torres-Roldán, Víctor
Universidad Nacional Autónoma de México
Resumen
In this paper, the paleomastozoologic record of the Baja California Peninsula is examined. It has been found to be scarce, but significant, and potentially of great importance for the understanding of the geological and paleontological evolution of the región, as well as useful in the biochronologic calibration of marine and continental faunas… In order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Buitrón, Blanca Estela; Barceló-Duarte, Jaime
Universidad Nacional Autónoma de México
Resumen
The Cretaceous sedimentary rocks cropping out in the San Juan Raya region, located some 40 km southwest of Tehuacán in the State of Puebla, include the Zapotitlán (Barremian)…. In order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Celis-Gutiérrez, Socorro
Universidad Nacional Autónoma de México
Resumen
Le présent travail a eu pour objet de contribuier à la connaissance des foraminifères quaternaires du Mexique… Pour continuer, télécharger l’article complet en PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Flores-Delgadillo, Lourdes
Universidad Nacional Autónoma de México
Resumen
A field study was carried out to prove the effect of phosphoric fertilization combined whit cattle and fowl manure on an association of grasses and clovers. The object was to determine the optimum productivity of these fodder plants within the regional edaphic and climatic conditions… In order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Gaona-Vizcayno, Salvador; Gordillo-de Anda, Tuchée; Villasuso-Pino, Miguel
Universidad Nacional Autónoma de México
Resumen
The Yucatán Península has several karst maniffestations. One of these, called cenote, cannot be explained by the traditional theory… In order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Mooser, Oswaldo
Universidad Nacional Autónoma de México
Resumen
Remains of fossil turtles of middle Pleistocene age from two ravines southeast of the City of Aguascalientes, State of Aguascalientes, Mexico, include an extant subspecies… In order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Mahood, Gail A.
Universidad Nacional Autónoma de México
Resumen
El complejo volcánico La Primavera, del Pleistoceno superior, que constituye la Sierra La Primavera al poniente de Guadalajara, consiste de lavas comendíticas (riolítico-peralcalinas), derrames piroclásticos, pómez, y de depósitos lacustres y fluviales asociados. Los domos y derrames, que se formaron a lo largo de dos zonas arqueadas están divididos en dos unidades cartografiables en base de su forma topográfica y su contenido de fenocristales. Estas dos unidades, la porfídica y la afírica, se distinguen también por sus características químicas de elementos traza y edades de K-Ar.
Las lavas más antiguas contienen 5-15 por ciento de fenocristales (sanidino sódico ≥ cuarzo >> ferrohedenbergita > fayalita > ilmenita), y se caracterizan por una peralcalinidad mayor que las lavas afíricas más recientes. La erupción de las lavas más antiguas comenzó hace 100,000 años aproximadamente, a lo largo de una zona de fractura con dirección hacia el norte, formando domos con diámetro de 1 a 4 km. La erupción de las últimas lavas porfídicas se efectuó hace 60-80,000 años aproximadamente.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Villegas-Soto, Mariano; Reyna-Trujillo, Teresa; Gómez-Tagle-Rojas, Alberto
Universidad Nacional Autónoma de México
Resumen
The area under study is in the Municipality of Tehuitzingo of the State of Puebla. The climate is warm with average annual temperature that ranges between 22°-26° C. The rainy season is in the summer and the average annual precipitation is 840 mm. The natural vegetation comprises deciduous plants and cacti. In the citrus and mango orchards there is noticeable chlorosis, which prompted to investigate the causes of tlus deficiency.
The soils can be classified within 5 series and 6 types, all of them are of alkaline nature, with low amounts of organic matter, little soluble salts and low fertility. The water for irrigation has high contents of soluble salts; therefore, it can be used only under very specific circunstances.
According to the information obtained in this study, it can be inferred that the soils need drainage as well as chemical compounds (gypsum, iron salts and chelates) in order to improve them. Also, it is neccesary to use rootstocks that can be propagated by vegetative means, which have been previously selected for saline conditions.
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