Person: Pieren Pidal, Agustín Pedro
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First Name
Agustín Pedro
Last Name
Pieren Pidal
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Geológicas
Department
Geodinámica, Estratigrafía y Paleontología
Area
Estratigrafía
Identifiers
8 results
Search Results
Now showing 1 - 8 of 8
Item Presencia y caracterización del "Alcudiense superior" (Vendiense) en el entronque de La Serena y El Valle de Alcudia (Este de la Provincia de Badajoz)(II Congreso Geológico de España, Granada 1988., 1988) Pieren Pidal, Agustín Pedro; Herranz Araújo, PedroUpper Alcudian series are studied in a new location in westernmost Alcudia Valley (Badajoz). Basal angular unconformity, inner disconformities, and the presence of dolos tones and ichnofossils suggesting the stratigraphic environment of these facies, are described. The paleogeograhic implications, as well as the magnitude of the intra-alcudian, sardic and taconic phases in this area are discussed. Finally the Upper Alcudian series are compared with known Upper Alcudian of neighbor areas.Item The Lusitanian-Marianic area as a new zone of the Hesperian massif. Stratigraphic arguments(Journal of conference abstracts, 1999) Herranz Araújo, Pedro; Pieren Pidal, Agustín Pedro; San José, M.Á. deItem Estratigrafia y estructura de los materiales permotriásicos del sector Gijón-La Collada (Asturias)(Cuadernos de geología ibérica, 1995) Pieren Pidal, Agustín Pedro; Areces, J.L.; Toraño, J.; Martínez García, ErnestoUna campaña de investigación geológico-minera del yacimiento carbonífero de «Mina La Camocha» ha aportado nuevos y abundantes datos del Pérmico de la Orla Cantábrica. Al no aflorar en ningún punto el Carbonífero investigado con fines mineros, se realizó una campaña de exploración profunda que contó con lineas sísmicas, sondeos geológico-mineros de superficie e interior y sondeos de investigación hidrogeológica. Todos ellos han permitido reconocer en varios puntos la cobertera permotriásica completa, aportando numerosas precisiones y la discriminación de unidades que generalmente no afloran. Se distinguen y caracterizan ocho unidades litoestratigráficas locales con rango de miembro, que se datan mediante correlación regional. En las unidades basales se observan importantes cambios de facies y de potencia relacionados con la configuración geodinámica inicial de la cuenca. Se propone un modelo de evolución ambiental de ésta. La investigación realizada permite situar y acotar en edad las principales fallas que en determinados momentos han condicionado la sedimentación, distinguiéndose fallas alpinas y tardihercinicas. Del estudio de estos materiales considerados pérmicos, ha resultado un mejor conocimiento de la Formación Caravia (»Saxoniense») en la subcuenca de Gijón-Villaviciosa.Item The Upper Alcunian from the Alcudia Anticline revisited. (Ciudad Real, Central Spain)(Journal of conference abstracts, 1999) Pieren Pidal, Agustín Pedro; García Hidalgo, J.F.Item Asociaciones palinológicas del tránsito Rhaetiense-Hettangiense en Asturias (España)(Geotemas, 2005) Barrón López, Eduardo; Gómez Fernández, Juan José; Goy Goy, Antonio; Pieren Pidal, Agustín PedroThe palynological study of 49 successive samples collected from the Vilorteo and Cantavieyo Diamond Drill Holes, drilled in the La Camocha Mine area, near Gijón (Asturias), allowed the characterization of three palynological assemblages. The oldest assemblage (PA 1) is characteristic of the Rhaetian. A precise age for the middle assemblage (PA2) cannot be assigned, due to the scarce productivity of the samples. The youngest assemblage (PA3) is characteristic of the Hettangian. Consequently the Triassic-Jurassic boundary (TJB) is located within the upper part of the carbonate succession of the Solís Mb. Two pa/ynozones, Rhaetipollis germanicus one and Krausselisporites reissingeri Zone, have been established. Their boundary nearly coincides with the TJB. A quantitative analysis reveals an increase in the proportion of hygrophilous and warmer taxa near the TJB, compatible with a global climatic change probably related with the end-Triassic mass extinction.Item A ~565 Ma old glaciation in the Ediacaran of peri‑Gondwanan West Africa(International Journal of Earth Sciences, 2018) Pieren Pidal, Agustín Pedro; Linneman, Ulf; Hofmann, Mandy; Drost, Kerstin; Quesada Ochoa, Cecilio; Gerdes, Axel; Marko, Linda; Gärtner, Andreas; Zieger, Johannes; Ulrich, Jens; Krause, Rita; Vickers-Rich, Patricia; Horak, JanaIn the Cadomian orogen of the NE Bohemian Massif and of SW Iberia, a post-Gaskiers glacial event dated at c. 565 Ma has been detected. Such Ediacaran-aged glaciomarine deposits occur in the Weesenstein and Clanzschwitz groups of the Saxo-Thuringian zone (Bohemia) and in the Lower Alcudian group of the southern Central Iberian zone (Iberia). Both areas are parts of Cadomia situated in the Western and Central European Variscides. Glaciomarine sedimentary rocks are characterized by such features as dropstones, flat iron-shaped pebbles (“Bügeleisen-Geschiebe”), facetted pebbles, dreikanters, and zircon grains affected by ice abrasion. For age and provenance determination, LA–ICP–MS U–Pb ages (n = 1124) and Hf isotope (n = 446) analyses were performed. The maximum age of the glaciomarine deposits within a Cadomian back-arc basin based on U–Pb analytics resulted in the youngest detrital zircon populations showing ages of 562–565 Ma and of c. 566–576 Ma old zircon derived from granitoid pebbles within the diamictites. The youngest age recorded was 538–540 Ma based on zircon from the plutons which had intruded the previously deformed Ediacaran metasedimentary rocks. Previously described glaciomarine diamictites of Cadomia (Weesenstein, Clanzschwitz, and Orellana diamictites) are most definitely younger than the c. 579–581 Ma Gaskiers glaciation in Newfoundland (Gaskiers) and in SE New England (Squantum). We propose the term Weesenstein–Orellana glaciation for this new Ediacaran glacial event, named after the most relevant regions of exposure. Palaeogeographically, these glaciomarine diamictites and related sedimentary deposits lie on the periphery of the West African Craton (western peri-Gondwana), and evidence has been provided by detrital zircon U–Pb ages and their Hf isotope composition. Correlation with similar glaciomarine deposits in the Anti-Atlas (Bou Azzer) and Saudi Arabia suggests a continued distribution of post-Gaskiers glacial deposits along the Gondwana margin of Northern Africa. The Weesenstein–Orellana glaciation correlates in part with the Shuram–Wonoka δ13C anomaly.Item Faunal dynamics between Iberia and Bohemia during the Oretanian and Dobrotivian (late Middle-earliest Upper Ordovician), and biogeographic relations with Avalonia and Baltica.(Acta Universitatis Carolinae. Geologica, 1999) Gutiérrez Marco, Juan Carlos; Rábano, Isabel; Sarmiento Chiesa, Graciela Noemí; Aceñolaza, Guillermo F.; San José, M.Á. de; Pieren Pidal, Agustín Pedro; Herranz Araújo, Pedro; Couto, Helena M.; Piçarra, José ManuelItem Public dissemination of knowledge regarding Ordovician geologicaland palaeontological heritage inprotected natural areas of Iberia(Acta palaeontologica sinica, 2007) Gutiérrez Marco, Juan Carlos; Rábano, Isabel; Sá, Artur A.; San José, M.Á. de; Pieren Pidal, Agustín Pedro; Sarmiento Chiesa, Graciela Noemí; Piçarra, José Manuel; Durán, Juan J.; Baeza, Eleuterio; Lorenzo Álvarez, Saturnino