Estudios Geologicos-Madrid最新文献

{"title":"Estudio de los caballos del yacimiento de Quibas, Pleistoceno Inferior final (Abanilla, Murcia, España)","authors":"P. Piñero, M. T. Alberdi","doi":"10.3989/EGEOL.41863.348","DOIUrl":"https://doi.org/10.3989/EGEOL.41863.348","url":null,"abstract":"In this paper, over 60 fossil horse remains from the latest early Pleistocene karstic site of Quibas (Abanilla, Murcia, Spain) are described. Their taxonomy and morphology, evolutionary stage, and paleoecological determining factors are studied. The multivariate analysis through comparison with different forms that occur in other Spanish and European localities shows that the majority of the fossils match the medium-sized species Equus altidens . This species represents the last form in the stenonoid lineage. In Spain, E. altidens is related to warm or warm-temperate climate, in woodlands or savanna-mosaic habitats. Equus suessenbornensis is also sparsely represented, first cited in the site of Quibas.","PeriodicalId":50496,"journal":{"name":"Estudios Geologicos-Madrid","volume":"82 1","pages":"034"},"PeriodicalIF":0.7,"publicationDate":"2015-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74188818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Registro de Carcharocles megalodon en el sector oriental de la Cuenca del Guadalquivir (Mioceno superior, Sur de España)","authors":"Matías Reolid, J. M. Molina","doi":"10.3989/EGEOL.41828.342","DOIUrl":"https://doi.org/10.3989/EGEOL.41828.342","url":null,"abstract":"Tortonian diatomites of the San Felix Quarry (Porcuna), in the Eastern Guadalquivir Basin, have given isolated marine vertebrate remains that include a large shark tooth (123.96 mm from apex to the baseline of the root). The large size of the crown height (92.2 mm), the triangular shape, the broad serrated crown, the convex lingual face and flat labial face, and the robust, thick angled root determine that this specimen corresponds to Carcharocles megalodon . The symmetry with low slant shows it to be an upper anterior tooth. The total length estimated from the tooth crown height is calculated by means of different methods, and comparison is made with Carcharodon carcharias . The final inferred total length of around 11 m classifies this specimen in the upper size range of the known C. megalodon specimens. \u0000The palaeogeography of the Guadalquivir Basin close to the North Betic Strait, which connected the Atlantic Ocean to the Mediterranean Sea, favoured the interaction of the cold nutrient-rich Atlantic waters with warmer Mediterranean waters. The presence of diatomites indicates potential upwelling currents in this context, as well as high productivity favouring the presence of large vertebrates such as mysticetid whales, pinnipeds and small sharks (Isurus). These large vertebrates recorded in the Eastern Guadalquivir Basin were potential prey of C. megalodon .","PeriodicalId":50496,"journal":{"name":"Estudios Geologicos-Madrid","volume":"72 1","pages":"032"},"PeriodicalIF":0.7,"publicationDate":"2015-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85593391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Origen y funcionamiento hidrogeológico del único criptohumedal subhalófilo-alcalinófilo en la facies Guadalajara del acuífero Terciario detrítico de Madrid","authors":"M. M. Garrido, J. P. García, M. Martínez","doi":"10.3989/EGEOL.41989.356","DOIUrl":"https://doi.org/10.3989/EGEOL.41989.356","url":null,"abstract":"Dehesa de Arriba wetland is a subhalofite-alkalinofite reed meadow so far not described among the Madrid tertiary aquifer wetlands. Is located in the medium-high area of Henares river tertiary basin. The evaporation phenomena are the reason of its diversity and the presence of alkaline efflorescence. The water in origin is the discharge of small evolve groundwater, of the type HCO 3 -Ca and mineralization of 700 μS/cm, 2 km southward from the point where Camarmilla is captured by Torote river. The morphology of the wetland play an important role in the distribution of the species and the alkaline efflorescence since determine the phreatic level depth and affects the extent of capillary water up to the surface. The drainage of the soils in scarce because the smooth topography and the small erosion of the river after its capture. To the wetland, that is now the born of the Camarmilla stream, arrives 56.400 m 3 of groundwater annually and its soils generate a surplus of 29.000 m 3 from december to may in average years. The alkalinity is high in any area, although is higher in the graminoids and cyperaceous zones and is the highest in the efflorescence with a pH of 10.3 and a concentration of Na+ in its solution of 2871 mg/l. No significant difference of these parameters have been found between the soils where juncus acutus is located and other juncacea soils. The formation processes of this wetland and its high plants diversity make it singular in the Madrid aquifer context and constitute a unique enclave in Castilla-La Mancha.","PeriodicalId":50496,"journal":{"name":"Estudios Geologicos-Madrid","volume":"37 ","pages":"037"},"PeriodicalIF":0.7,"publicationDate":"2015-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72429738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Las huellas de tortuga del Grupo Oncala (Berriasiense, Cuenca de Cameros, España)","authors":"C. Pascual-Arribas, N. Hernández-Medrano","doi":"10.3989/EGEOL.41821.341","DOIUrl":"https://doi.org/10.3989/EGEOL.41821.341","url":null,"abstract":"Although the dinosaur footprints are very frequent in the Oncala Group (Cameros Basin), it does not happen with the tracks of other reptiles, especially in the case of crocodiles and turtles. Up to now, only one ichnogenus freshwater turtle track morphotype ( Emydhipus ) is known in this group, and it is possible the existence of other terrestrial tortoises tracks. The finding of new tracks and the general review of the known material, suggest that the turtle tracks are more variable and widespread than we previously thought, which corresponds with the existence of a large representation of a recently recognized turtle genus from the Lower Cretaceous of Cameros Basin and also from the whole the Iberian Peninsula.","PeriodicalId":50496,"journal":{"name":"Estudios Geologicos-Madrid","volume":"40 1","pages":"030"},"PeriodicalIF":0.7,"publicationDate":"2015-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81940870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Primer registro fehaciente de Nopachtus coagmentatus (Xenarthra, Cingulata, Glyptodontidae) en la región Pampeana, Argentina. Contexto estratigráfico","authors":"Martín Zamorano, M. D. L. Reyes, D. Poiré, G. J. Scillato-Yané","doi":"10.3989/EGEOL.41808.339","DOIUrl":"https://doi.org/10.3989/EGEOL.41808.339","url":null,"abstract":"The species Nopachtus coagmentatus was recognized by Amegino in 1888, on the basis of sections of the caudal tube and the dorsal carapace. These remains comes from Valles de las Sierras de Cordoba near Villa Cura Brochero, and stratigraphically from the Brochero Formation (Montehermosan-Chapadmalalan [early Pliocene - late Pliocene]). Ameghino also mentioned N. coagmentatus for the Monte Hermoso Formation (Montehermosan), but the determination Ameghino is highly questionable. The exploitation of Precambrian rocks from the center of the Sierras Bayas in Olavarria (Buenos Aires province) allowed the identification from the bottom to the top, of La Alcancia Formation (Miocene), El Polvorin Formation (Pliocene), La Esperanza Formation and El Buho Formation (both late Pleistocene). In this contribution present osteoderms of the latero-dorsal portion of the posterior region of the dorsal carapace of N. coagmentatus . The specimen was extracted from brownish sandy-silt sediments of La Alcancia Quarry (36°58′40′′.06 S; 60°12′23′′.92 W) corresponding to El Polvorin Formation (Upper Chapadmalalan) and correspond to the first reliable record of N. coagmentatus for the Pampean region. Finally, we offer a detailed description of the specimen, and its geographic and stratigraphic provenance.","PeriodicalId":50496,"journal":{"name":"Estudios Geologicos-Madrid","volume":"102 1","pages":"027"},"PeriodicalIF":0.7,"publicationDate":"2015-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84251842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New insight into the Pleistocene deposits of Monte delle Piche, Rome, and remarks on the biochronology of Hippopotamus (Mammalia, Hippopotamidae) and Stephanorhinus etruscus (Mammalia, Rhinocerotidae) in Italy","authors":"L. Pandolfi, F. Grossi, V. Frezza","doi":"10.3989/EGEOL.41796.337","DOIUrl":"https://doi.org/10.3989/EGEOL.41796.337","url":null,"abstract":"Several large mammal assemblages have been collected in the Roman basin since the XIX century, but they usually lack any stratigraphic datum or details about the fossiliferous localities. In this work, the stratigraphic provenance of large mammal remains discovered at Monte delle Piche (Rome) is investigated. The systematic revision of these specimens allows the recording of the presence of Hippopotamus sp., Stephanorhinus sp. and Stephanorhinus etruscus . On the basis of micropalaeontological analysis performed on sediment sampled from the studied speci-mens and considering the stratigraphy of the area, two fossiliferous levels are recognised at Monte delle Piche. \u0000The remain of the hippopotamus was collected in fluvial gravels and sand deposits, in which the presence of Cyprideis is also recorded. This deposit is chronologically related to the latest Early-early Middle Pleistocene. Hippopotamus was present in Italy and Western Europe from the latest Villafranchian to MIS 4/3. The mandible of S. etruscus was collected in marine deposits along with abundant foraminifera and ostracods, which corre-late with the late Early Pleistocene. Stephanorhinus etruscus occurred in Western Europe at the beginning of the Villafranchian, and it was documented until the end of the Villafranchian in Italy and until the Early-Middle Pleistocene transition in the Iberian Peninsula.","PeriodicalId":50496,"journal":{"name":"Estudios Geologicos-Madrid","volume":"28 1","pages":"026"},"PeriodicalIF":0.7,"publicationDate":"2015-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73935282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Análisis paleoambiental de los depósitos aluviales de la sección de Cenicero a partir de las asociaciones de ostrácodos (Mioceno inferior, NO de la Cuenca del Ebro)","authors":"B. García, Oier Suárez Hernando, J. Hernández, A. S. Bilbao, Javier Murélaga Bereicua","doi":"10.3989/EGEOL.41729.320","DOIUrl":"https://doi.org/10.3989/EGEOL.41729.320","url":null,"abstract":"In this work we perform for the first time a palaeoenvironmental and biostratigraphic analysis of the lower Miocene alluvial deposits of the Cenicero section (NW sector of the Ebro Basin; N Iberian Peninsula), based on the ostracod and micromammal assemblages. One of the main characteristics of this section is the unusual abundance on non-reworked ostracods present in the studied samples compared to other European sequences of similar age and sedimentary environment. This fact has allowed us to develop precise palaeoenvironmental reconstructions. The variations of the identified ostracod assemblages, defined by species such as Cyclocypris laevis, Ilyocypris bradyi, Ilyocypris gibba, Limnocythere sp. or Pseudocandona parallela , record the development of small, ephem-eral and shallow ponds in a distal alluvial and/or floodplain environment. Towards the upper part of the section the ponds appear to be less ephemeral, being the aquatic systems more stable for ostracods development. Variations in the water temperature and salinity have been observed along the section, which are related to changes in the local pluviometric regime. On the other hand, the presence of micromammals in one of the studied samples has allowed the precise dating of this section. Thus, the presence of Armantomys daamsi dates the Cenicero section as Agenian (lower Miocene), local zone Y2 (MN2).","PeriodicalId":50496,"journal":{"name":"Estudios Geologicos-Madrid","volume":"23 1","pages":"024"},"PeriodicalIF":0.7,"publicationDate":"2015-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82160006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geocronología de los yacimientos achelenses de Pinedo y Cien Fanegas (Valle del Tajo) e implicaciones en la evolución fluvial en el entorno de Toledo (España)","authors":"Mario López-Recio, Pablo G. Silva, E. Roquero, P. P. Cunha, F. Tapias, Manuel Alcaraz-Castaño, Javier Baena, Felipe Cuartero, J. Morín, T. Torres, J. Ortíz, A. Murray, Jan-Pieter Buylaert","doi":"10.3989/EGEOL.41816.340","DOIUrl":"https://doi.org/10.3989/EGEOL.41816.340","url":null,"abstract":"This study presents the first geochronological data from several research projects focused on the chronostratigraphy of the Tagus fluvial terraces in the environs of Toledo city (Central Spain). The research is centered on Middle to Late Pleistocene fluvial terraces with palaeontological and Acheulean sites of similar Palaeolithic technology than those showed by the lithic assemblage of the Pinedo site (Maximo Martin Aguado Collection). This study includes the first IRSL and AAR datings for the fluvial levels at +25−30 m present in the Acheulean sites of Pinedo (Toledo) and Cien Fanegas (Aranjuez). The obtained ISRL dates ( > 280 ky and 292±17 ky) indicate that these fluvial levels and hence their associated Palaeolithic sites, were formed during the marine isotopic stages MIS 9 and MIS 8, and thus it is possible to correlate them with the Arganda II Unit of the adjacent Jarama valley. However, data from Pinedo suggest that this Acheulean site probably also correspond to the upper Arganda I Unit of the Jarama valley (MIS 11–MIS 9). Although the AAR date (226±37 ky) obtained for the Upper unit of Pinedo has to be carefully considered (due to the scarce stratigraphic data and the low dentine levels found in the Equus sp. analyzed samples), it could indicate that sedimentation of the studied terrace level reached the MIS 7, as may also occur in the Jarama valley (Valdocarros site). In the analyzed sector of the Tagus valley, continuous fluvial sedimentation was favored by the occurrence of Neogene evaporites karst-linked subsidence (upstream) and the presence of an outstanding internal base-level represented by the bedrock incised meander of Toledo (downstream). The dating method used in this study (post-IR- IRSL) has allowed us to obtain the oldest date from fluvial sandy deposits in the Tagus fluvial basin up to the present time.","PeriodicalId":50496,"journal":{"name":"Estudios Geologicos-Madrid","volume":"290 1","pages":"029"},"PeriodicalIF":0.7,"publicationDate":"2015-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83548238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estudio preliminar del esqueleto postcraneal del Muscardinus cyclopeus Agustí, Moyà-Solà & Pons-Moyà, 1982 (Mammalia, Rodentia, Myoxidae)","authors":"J. Q. Cardona","doi":"10.3989/EGEOL.41618.305","DOIUrl":"https://doi.org/10.3989/EGEOL.41618.305","url":null,"abstract":"For the first time, the partial skeleton of the Pliocene Muscardinus cyclopeus is described from Punta Nati-3, located in the northwest of the municipality of Ciutadella de Menorca (Balearic Islands, western Mediterranean). Based on bone parameters it is shown that the size of Muscardinus cyclopeus is on overage 69% higher than that of Muscardinus avellanarius . The main features that distinguish M. cyclopeus from M. avellanarius are, among others: the relatively wider diameter of the proximal epiphysis of the ulna; the relatively shorter olecranon; the less marked concavity in the fovea of the proximal epiphysis of the radius; the relatively shorter ilium; the more symmetrical epicondyles of the distal femoral epiphysis; the relatively higher lateral epicondyle dorsoventrally, with a very flat ventral surface; and the relatively narrower tibia transversely. As a species evolved in an insular context, it is still very difficult to discern which of these characters are primitive and which are derived.","PeriodicalId":50496,"journal":{"name":"Estudios Geologicos-Madrid","volume":"41 1","pages":"022"},"PeriodicalIF":0.7,"publicationDate":"2015-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77936111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Aplicación de los clorofluorocarbonos y el hexafluoruro de azufre como trazadores hidrogeológicos en los acuíferos carbonatados del Parque Natural del Barranco del Río Dulce (Guadalajara)","authors":"M. M. Garrido, R. Fisher, S. Alcaide, P. M. Santos","doi":"10.3989/EGEOL.41787.332","DOIUrl":"https://doi.org/10.3989/EGEOL.41787.332","url":null,"abstract":"A partir de la informacion procedente de los puntos de agua de los acuiferos asociados a los materiales carbonatados jurasicos y cretacicos proximos al Parque Natural del Barranco del Rio Dulce (PNBRD) y de su estructura geologica, se ha establecido un modelo conceptual de flujo subterraneo cuya dinamica fue validada con la interpretacion de los contenidos en CFCs y SF6, nunca antes utilizados en Espana con estos propositos, de algunas muestras situadas en distintas posiciones. En todos los puntos se reconoce la existencia de una fraccion de agua infiltrada antes de 1950 que es mayor en las zonas de recarga de los acuiferos de edad Jurasico donde a traves del modelo exponencial se llega a edades aparentes de hasta 100 anos. La interpretacion de los contenidos en CFCs de todas las muestras a partir del modelo de mezcla binaria, refleja edades superiores a los 17 anos para la fraccion joven que puede corresponder con aquella que circula por los canales de tamano intermedio entre la matriz rocosa y los conductos karsticos mayores. Aun no perteneciendo a la misma unidad acuifera, los puntos con mayor proporcion de aguas “post-1950” se situan en los valles fluviales de los macizos cretacicos. Los resultados son coherentes con sistemas acuiferos de escaso gradiente general, por lo elevado de las edades aparentes obtenidas, la existencia de multiples entradas de agua y de al menos una doble porosidad, elementos establecidos en el modelo conceptual. En los acuiferos de edad Cretacico existen conductos karsticos que elevan el caudal de los manantiales de forma rapida tras las precipitaciones y cuya influencia no se refleja en las muestras estudiadas. Los CFCs pueden ser utiles para indicar la existencia de fenomenos de contaminacion urbana actual. Los valores de edad derivados de las concentraciones de SF6 son inferiores a los deducidos con los CFCs por un probable aporte de este gas del sustrato invalidando su uso como trazador. El futuro del uso de los CFCs se encuentra comprometido por la tendencia decreciente de su concentracion en la atmosfera, aunque la comparacion del CFC-12 con el SF6, alli donde este gas no sufra incorporaciones de origen geologico, mantendra su utilidad.","PeriodicalId":50496,"journal":{"name":"Estudios Geologicos-Madrid","volume":"89 1","pages":"025"},"PeriodicalIF":0.7,"publicationDate":"2015-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88299652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}