Stratigraphy and biostratigraphy (charophytes) of the marine-terrestrial transition in the Upper Eocene of the NE Ebro Basin (Catalonia, Spain)
Sanjuan, J. (Universitat de Barcelona. Departament d'Estratigrafia, Paleontologia i Geociències Marines)
Martín-Closas, Carles (Universitat de Barcelona. Departament d'Estratigrafia, Paleontologia i Geociències Marines)
Serra-Kiel, Josep (Universitat de Barcelona. Departament d'Estratigrafia, Paleontologia i Geociències Marines)
Gallardo, H. (Universitat de Barcelona. Departament d'Estratigrafia, Paleontologia i Geociències Marines)

Date:	2012
Abstract:	The onset of endorheic sedimentation in the Ebro Basin is a prominent feature of the basin's evolution and has recently been characterized as a rapid event occurring in the Early Priabonian. In the north-eastern part of the basin this event coincides with the deposition of the Artés Formation (Fm. ), mainly built up by red beds of alluvial origin. The marine-continental boundary has been poorly studied up to now in the so-called Lluçanès area, and what was previously thought to be the base of the Artés Fm. is actually a transitional unit, which we define as the Sant Boi Formation, which covers the underlying marine Milany Depositional Sequence and passes laterally to the Terminal Complex, extending over 15km along the eastern margin of the Ebro Basin. The Sant Boi Fm. is formed by up to 15-20m of alternating siltstones and lutite, grading upwards to brackish and lacustrine marls and lignite, and represents deposition in a brackish to freshwater floodplain. It is characterized biostratigraphically by the fossil charophyte assemblage Harrisichara lineata, Harrisichara vasiformis-tuberculata and Nodosochara jorbae, from the middle part of the Priabonian. In contrast, the overlying red beds of the Artés Fm. are characterized by assemblages containing Harrisichara tuberculata, Nodosochara jorbae and Lychnothamnus longus from the Late Priabonian. These results are largely consistent with recent magnetostratigraphic studies performed south of the studied area, and have enabled us to refine the stratigraphy of the marine-continental transition in the north-eastern Ebro Basin.
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Charophyta ; Biostratigraphy ; Ebro Basin ; Eocene ; Oligocene
Published in:	Geologica acta, Vol. 10, Núm. 1 (Març 2012) , p. 19-31, ISSN 1696-5728

Adreça alternativa: https://raco.cat/index.php/GeologicaActa/article/view/252408
Adreça alternativa: https://revistes.ub.edu/index.php/GEOACTA/article/view/105.000001708
DOI: 10.1344/105.000001708

14 p, 3.4 MB

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