ISSN: 2310-2799
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546,196 artículos
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Año:
2019
ISSN:
2007-2902, 1026-8774
Moreno-Ruiz, José Luis; Carreña, Ana Luisa
Universidad Nacional Autónoma de México
Resumen
In the Vizcaíno Basin, near the Bahía Asunción village, Baja California Sur, unconformably over the Valle Formation, an unnamed sedimentary Neogene sequence crops out. This sequence consists of phosphatic sandstone overlain by diatomite, which is in turn unconformably overlain by calcareous sandstone and conglomerate. At the locality Diatomite Valley, whose name is informally applied herein to the diatomaceous unit, index diatom species allow the assignment of these outcrops to an early late Miocene age, equivalent to the Subzone d of Denticulopsis hustedtii-Denticulopsis lauta Zone, of about 8.9 to 8.4 Ma...In order to continue, download full text in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Perrilliat, María del Carmen
Universidad Nacional Autónoma de México
Resumen
A new species of the genus Pycnodonte Fischer de Waldheini; 1835, of the Family Gryphaeidae and six other species of bivalves are described from the Tuxpan Formation of middle Miocene age of the northern part of the State of Veracruz. The new species is compared with the known species of the genus of the Tertiary Caribbean Molluscan Faunal Province. The geographic distribution of this genus is extended, as well as that of other six bivalve middle Miocene species of the Tuxpan Formation... In order to continue, download full text in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Mainelli, Michele
Universidad Nacional Autónoma de México
Resumen
A new species (Apricardia manuelae) in described from the carbonate neritic facies of the lower Turonian in the northeastern Mate Massif, located at the southern part of the Apennines of Italy… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
García-Barrera, Pedro
Universidad Nacional Autónoma de México
Resumen
Toucasia hancockensis Whintney was found in a new locality of early of Albian age in southwestern Mexico. This species was first described in the Glen Rose Limestone of Bandera County, Texas, U.S.A… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Palacio-Prieto, José Luis; Siebe-Grabach, Christina
Universidad Nacional Autónoma de México
Resumen
Based on the study of spatial variability, the cartography of six chemical soil parameters-boron, pH, electric conductivity, organic matter and chloride-in the Irrigation District 03, of Tula, State of Hidalgo, was prepared through interpolation using kriging. Cartography referring to total carbonates, soil depth, percentage of sand, silt and clay using a weighted moving average interpolation procedure was also prepared. Maps showing soil textural classes and areas differentiated according to time under irrigation and irrigation water quality were obtained, by processing data using a geographical information system. All maps refer to results on a regional basis. Recommendations for the use of geostatistical techniques in future studies are proposed... In order to continue, download full text in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Reynoso-Rosales, Víctor Hugo; Montellano-Ballesteros, Marisol
Universidad Nacional Autónoma de México
Resumen
In regard of similarities between dental sizes and patterns, Mooser and Dalquest in 1975 reduced to seven the 11 equid species suggested by Mooser in 1958 in the Cedazo local fauna. According to the improbable coexistence of so many equids in a single tanatocenosis, fossil material from these deposits was reexamined in a quantitative approach. Working with the hypothesis that the simultaneous presence of two or more equid species is only possible if at least one anatomical character is morphologically displaced. A frequency distribution analysis on the size curves-represented by antero-posterior diameters of cheek teeth-and of other quantitative dental characters considered of taxonomic importance-ratio of transverse and antero-posterior diameters and ratio of the length of protocone and antero-posterior diameter-suggest that the sample is homogeneous... In order to continue, download full text in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Sirkin, Les; Pedrín-Avilés, Sergio; Padilla-Arredondo, Gustavo; Díaz-Rivera, Ernesto
Universidad Nacional Autónoma de México
Resumen
Research has emphasized pollen and radiocarbon analyses of core samples from coastal mangroves and lagoons and two upland wetlands and dating of raised marine terraces. Mangroves north of La Paz are underlain by up to 4.25 m of peat and lagoonal sediments, deposited over a mid-Wisconsinan coral platform (ca. 25,000 yr BP). Pollen spectra show red mangrove and NAP dominance and suggest relative sea-level rise 9,000 years ago. Significant increases in thorn forest, red and white mangrove, grass and cheno-ams take place after 8,000 yr BP. A progradational event around 4,000 yr BP may be the result of crustal uplift. Subsequently, increases in white and black mangroves and NAP, and decreases in red mangrove suggest development of paludal conditions... In order to continue, download full text in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Pons, José María; Reali, Sandro; Sartorio, Dario
Universidad Nacional Autónoma de México
Resumen
Hippuritella sharwaynensis sp. nov. is described from the Maastrichtian (Sharwayn Formation) of Yemen; this species also occurs in the lower part of the Auradu limestones in northern Somalia, from where two badly preserved specimens were odentified as Hippuritella sp. gr. Toucasi (d´Orbigny) by the first autor… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Philip, Jean M.; Platel, Jean Pierre
Universidad Nacional Autónoma de México
Resumen
A cartographic and stratigraphic study of the Upper Cretaceous series surrounding the Haushi-Huqf massif (easter Oman) has allowed to subdivide it into lithostratigraphic formations and to refine their chronostratigraphic age… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Steuber, Thomas
Universidad Nacional Autónoma de México
Resumen
The carbon and oxygen isotopic composition was analysed several shells of Vaccinites cornuvaccinum (Bronn) from late Santonian-Campanian transgressive deposits of Beotia (central Greece) … in order to continue, download the full paper in PDF.
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