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Browsing Geogaceta -- Nº 22, (1997) by Issue Date
Now showing items 1-20 of 56
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El tránsito Cretácico-Terciario en Beloc, Haití: registro micropaleontológico e implicaciones bioestratigráficas
(Sociedad Geológica de España, 1997)The section studied is located immediately south of the village of Beloc, in the Southern Peninsula of Haiti. Rock sequences of that locality have the distinctive stratigrapbic characteristic of yielding a series that spans ... -
Ramp calcarenite sheet depositional system as a recorder of sea-level fluctuations (Late Albian, Alsasua, Spain)
(Sociedad Geológica de España, 1997)The Albian Aitziber calcarenites (Alsasua, Navarra) are analysed on the basis of their overall geometry, types of limiting boundaries, internal composition, facies, sedimentary structures and paleogeographical context. An ... -
Mineralogía de arenas y edad en una secuencia de superficies entre el río Tajo y los Montes de Toledo
(Sociedad Geológica de España, 1997)We study the heavy minerals in the fine sand from Bt horizons of soils developed in a serie of surfaces related to the Tajo river and Los Montes de Toledo. We found a sequence in the weathering degree of the detrital ... -
Moluscos bivalvos de las facies cuarcíticas del Ordovícico Inferior centroibérico
(Sociedad Geológica de España, 1997)Some scarce and bad preserved bivalves have been described from few localities lying at the upper part of the Armorican quartzite facies in Central Spain. Middle Arenig faunas include two palaeotaxodont forms (Praenucula ... -
Las areniscas de la Formación de Gordexola (Albiense, flanco sur del Anticlinorio de Bilbao, Vizcaya) I: Composición y procedencia
(Sociedad Geológica de España, 1997)The sandstones of the Gordexola Formation have been petrologically and geochemically studied. The averageofQ(= 57%), FdK+Plag(= 6%) and rock fragments (= 4%) in sandstones was plotted against the Dickinson et al. (1983) ... -
Estudio textural y mineralógico de rizocreciones en los suelos terciarios de la cuenca del río Amarguillo (Toledo)
(Sociedad Geológica de España, 1997)The paleosoils of the Miocene from the Amarguillo river basin show an important development of edaphic features. These are principally argillaceous fillings of old root casts. These rizocretions show several different ... -
Evolución y diagénesis de una caliza oolítica (Formación Drum, Carbonífero, Kansas, EEUU)
(Sociedad Geológica de España, 1997)The Drum limestone is an algal build-up and oolite complex formed as a E-W belt at the shelf edge of the Pennsylvanian northamerican mid continent. The Drum formation lies on an erosive surface and formed in two depositional ... -
Asociaciones de foraminíferos bentónicos cuaternarios de la plataforma del río Maroni (Guayana francesa): contribución paleogeográfica
(Sociedad Geológica de España, 1997)The distribution of benthic foraminiferal microfauna recovered from two cores on the Maroni continental shelf (French Guiana) has been studied. 1 00 species and two types of foraminiferal assemblages have been identified ... -
La discordancia de Moyuela (Zaragoza): precisiones sobre la tectónica extensional en el límite Oxfordiense-Kimmeridgiense en la Cuenca Ibérica
(Sociedad Geológica de España, 1997)An angular unconformity has been found at the lower part of the Sot de Chera Fm. near the village of Moyuela (Northern Iberian Chain, NE Spain). This unconformity develops during a tectonic extension at the turn of the ... -
Estructura del sector norte de la Cuenca de Almazán (Cordillera Ibérica)
(Sociedad Geológica de España, 1997)The Tertiary compressional structure of the northern sector of the Almazan basin is defined by several E-W to NW-SE trending folds. These folds extend from the northern and eastern basin borders to the central part. ... -
Barita de neoformación en la Arenisca de Villamayor (Salamanca). Estudio preliminar
(Sociedad Geológica de España, 1997)The barite studied in the Villamayor sandstone is located in old rhizoliths related to subvertical fractures which affect these subarcosic deposits. These zones are actually in great circulation within underground waters ... -
Análisis preliminar de los ostrácodos del Mioceno Inferior de las Bardenas Reales de Navarra (Cuenca del Ebro)
(Sociedad Geológica de España, 1997)The outcrops of the Tudela Formation, Lower Miocene (Ramblian), in the Bardenas Reales of Navarra (western area of the Ebro Basin) are very rich on vertebrate remains (fishes, amphibians, reptiles, birds and mammals), ... -
Las estructuras paleokársticas del Monte Baio (Araba/Alava): su relevancia para una evaluación cuantitativa del descenso del nivel marino del Paleoceno medio
(Sociedad Geológica de España, 1997)During the period of sub-aerial exposure subsequent to the mid-Paleocene sea level fall, a set of paleokarstic features were generated in upper Danian lagoonal limestones of the Alava province. The most interesting of them ... -
Características de la llanura intermareal asociada al canal de Mira (dominio interno del complejo isla-barrera de Aveiro, Portugal)
(Sociedad Geológica de España, 1997)The Mira channel, located in the inner domain of the Aveiro barrier-island complex, is subdivided in three sections: head, intermediate and mouth, according to their morphological and sedimentary features. Their study shows ... -
Asociaciones de foraminíferos y ostrácodos en el Cenomaniense de Leioa (Cuenca Vasca)
(Sociedad Geológica de España, 1997)The Leioa section is representative of deep Cenomanian sedimentation from the western area of the Basque Basin. Detailed analysis of the microfaunas of foraminifers (planktonic and benthic) and ostracodes, taking into ... -
Arquitectura sedimentaria y estratigrafía secuencial del Cenomaniense superior-Cenomaniense terminal. Cordillera Ibérica Central
(Sociedad Geológica de España, 1997)The D.S. «Cabrejas del Pinar» is recorded during upper Cenomanian-uppermost Cenomanian. The low system tract is not recorded. No clear evidences for the high system tracts and similar facies on the field between two ... -
El estrangulamiento en enero de 1970 del meandro del castillo de Aldovea en el río Henares
(Sociedad Geológica de España, 1997)The meandering planform evolution between 1877 and 1 995 AD of the Castillo de Aldovea meander, at the lower reach of the Henares river, was studed. Topographic maps (form 1877 to 1995) and a series of aerial photographs ... -
Variaciones de la anisotropia de la susceptibilidad magnética en turbiditas albienses de la Cuenca Vasco-Cantábrica
(Sociedad Geológica de España, 1997)The first results extracted from the study of the Anisotropy of magnetic susceptibility (ASM) from 33 turbidites allocated in Basque-Cantabrian basin show the validity of the ASM as a rock fabric analysis tool to determine ... -
Las asociaciones de foraminíferos bentónicos de la serie margo-diatomítica de Sidi Haj Youssef (Boudinar, Marruecos nord-oriental)
(Sociedad Geológica de España, 1997)The Messinian section of Sidi Haj Youssef (Boudinar basin- NE. Morocco) with alterancy of marl and diatomitic levels, is very rich in benthonic foraminifera and wich are represented by 102 species. The quantitative studies ... -
Contransting shallowing versus deepening upward cycles and their position in a carbonate ramp (Lower Cretaceous, Gorbea, Bizkaia)
(Sociedad Geológica de España, 1997)Contrasting deepening versus shallowing upward cycles formed in different depositional settings of a carbonate ramp: shallowing upward cycles characterize the inner ramp, whereas deepening upward cycles characterize the ...
