Asociaciones de ostrácodos del Mioceno Temprano–Medio de Loma Negra (Bardenas Reales de Navarra, Cuenca del Ebro): evolución paleoambiental de un medio lacustre



Document title: Asociaciones de ostrácodos del Mioceno Temprano–Medio de Loma Negra (Bardenas Reales de Navarra, Cuenca del Ebro): evolución paleoambiental de un medio lacustre
Journal: Ameghiniana
Database: PERIÓDICA
System number: 000382137
ISSN: 0002-7014
Authors: 1
1
1
1
1
2
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3
Institutions: 1Universidad del País Vasco, Facultad de Estratigrafía y Paleontología, Bilbao, Vizcaya. España
2Instituto Geológico y Minero de España, Unidad Zaragoza, Zaragoza. España
3Universidad de Valencia, Departamento de Geología, Valencia. España
Year:
Season: Oct
Volumen: 51
Number: 5
Pages: 405-419
Country: Argentina
Language: Español
Document type: Artículo
Approach: Analítico, descriptivo
English abstract The palaeoenvironmental evolution of the Loma Negra section (Bardenas Reales de Navarra, Ebro Basin) during the lower–middle Miocene, is studied for the first time. The paleoenvironmental interpretation is based on the recovered ostracod assemblages and the sedimentology. The lower part of this section is composed by red, yellow and grey mudstones, and with Paralimnocythere sp. as the most abundant ostracod taxon. The lithological features and the faunistic assemblage allows the interpretation of a paleoenvironment with the development of shallow water bodies with stagnant, warm and fresh to oligohaline waters in distal alluvial flood plains for this section. The presence of some sandstone levels where the most abundant ostracod species is Cyclocypris laevis (Müller) marks punctual higher energy events inside this alluvial system and the presence of more saline waters. The upper part of the section is formed by grey limestones with interbedded fine grey mudstones. In this interval, Pseudocandona parallela Müller is the most abundant ostracod species, indicating the development of a stable lacustrine system with water currents, and temperate to cold and oligohaline to mesohaline waters. The transition between the alluvial and the lacustrine systems shows a gradual evolution
Disciplines: Biología
Keyword: Moluscos,
Paleontología,
Taxonomía y sistemática,
Ostracoda,
Mioceno,
Paleoambiente,
Fósiles,
Navarra,
España
Keyword: Biology,
Molluscs,
Paleontology,
Taxonomy and systematics,
Ostracoda,
Miocene,
Paleoenvironments,
Fossils,
Navarra,
Spain
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