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dc.contributor.author Pérez, Leandro Martín
dc.contributor.author Perez Panera, Juan Pablo
dc.contributor.author Aguilera, Orangel A.
dc.contributor.author Ronchi, Diana I.
dc.contributor.author Sánchez, Rodolfo
dc.contributor.author Manceñido, Miguel Oscar
dc.contributor.author Sánchez Villagra, Marcelo R.
dc.date.available 2019-02-12T19:45:40Z
dc.date.issued 2016-09
dc.identifier.citation Pérez, Leandro Martín; Perez Panera, Juan Pablo; Aguilera, Orangel A.; Ronchi, Diana I.; Sánchez, Rodolfo; et al.; Palaeontology, sedimentology, and biostratigraphy of a fossiliferous outcrop of the Early Miocene Querales Formation, Falcón Basin, Venezuela; Springer; Swiss Journal of Palaeontology; 135; 2; 9-2016; 187-203
dc.identifier.issn 1664-2376
dc.identifier.uri http://hdl.handle.net/11336/69995
dc.description.abstract The top of the Querales Formation is well exposed at the Quebrada Corralito section, 17 m thick, in northern Venezuela. The section, dominated by siliciclastic accumulations of fine-grained sediments, preserves one cycle of transgressive–regressive phases of the deltaic environments facing the marine platform. An X-ray analysis revealed kaolinite as the main clay mineral. The age ranges from late Early Miocene to early Middle Miocene—zones N8 to N9, Late Burdigalian to Langhian. The section shows low biodiversity, including eleven macroinvertebrate taxa and two ichnotaxa; at its base, it contains mostly plant debris and amber from the continent, thus revealing a continental source near the littoral zone. Its middle portion preserves macroinvertebrates from the littoral zone, but also including the cephalopod Aturia sp., transported by a hydraulic flow to an area of greater depth; these macroinvertebrates are absent from overlying sections, at a time in which the basin was flooded most. The X-ray diffraction on six rock samples revealed mainly the presence of quartz with calcite, subordinated plagioclase and traces of potassium feldspar. Other minerals that compose this stratigraphic section are pyrite, dolomite and siderite, but they are disseminated in a siltstone. The section is dominated by mudstone sediments. The succession is kaolinite in the most pure fraction, and in lesser proportion smectite and illite; the stratified illite–smectite, chlorite and chlorite–smectite are present in low quantity. The mineralogical components of a molluscan valve were also examined, showing abundant pyrite, and moderate amounts of siderite and dolomite. In a part of the section, we recorded a rich assemblage of calcareous microfossils with foraminifers, nannofossils and marine ostracods. In the foraminiferal assemblage, 99 % correspond to planktonic forms. Most macroinvertebrates from benthonic assemblages suggest that they may have inhabited a near-shore marine environment, and sporadically experienced storm transport to deeper, shelf waters.
dc.format application/pdf
dc.language.iso eng
dc.publisher Springer
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject AMBER
dc.subject CALCAREOUS MICROFOSSILS
dc.subject FALCÓN BASIN
dc.subject FOSSIL MACROINVERTEBRATES
dc.subject NEOGENE
dc.subject URUMACO
dc.subject.classification Paleontología
dc.subject.classification Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification CIENCIAS NATURALES Y EXACTAS
dc.title Palaeontology, sedimentology, and biostratigraphy of a fossiliferous outcrop of the Early Miocene Querales Formation, Falcón Basin, Venezuela
dc.type info:eu-repo/semantics/article
dc.type info:ar-repo/semantics/artículo
dc.type info:eu-repo/semantics/publishedVersion
dc.date.updated 2019-02-12T13:23:15Z
dc.identifier.eissn 1664-2384
dc.journal.volume 135
dc.journal.number 2
dc.journal.pagination 187-203
dc.journal.pais Suiza
dc.description.fil Fil: Pérez, Leandro Martín. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleozoología Invertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil Fil: Perez Panera, Juan Pablo. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleozoología Invertebrados; Argentina. YPF - Tecnología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil Fil: Aguilera, Orangel A.. Universidade Federal Fluminense; Brasil
dc.description.fil Fil: Ronchi, Diana I.. YPF - Tecnología; Argentina
dc.description.fil Fil: Sánchez, Rodolfo. Municipio de Urumaco. Museo de Paleontología; Venezuela
dc.description.fil Fil: Manceñido, Miguel Oscar. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleozoología Invertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil Fil: Sánchez Villagra, Marcelo R.. Universitat Zurich; Suiza
dc.journal.title Swiss Journal of Palaeontology
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1007/s13358-015-0105-y
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs13358-015-0105-y
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)