Evolución ambiental holocena del estuario del Oka (reserva de la biosfera de Urdaibai, sureste del golfo de Bizkaia)respuesta al ascenso postglacial del nivel del mar
- Ane García-Artola 1
- Alejandro Cearreta 1
- Manuel Monge-Ganuzas
- B.P. Horton 2
- D. Nikitina 3
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1
Universidad del País Vasco/Euskal Herriko Unibertsitatea
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Universidad del País Vasco/Euskal Herriko Unibertsitatea
Lejona, España
- 2 Nanyang Technological University, Singapore
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3
West Chester University
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Editorial: Universidad del País Vasco = Euskal Herriko Unibertsitatea
ISBN: 978-84-17713-16-4
Año de publicación: 2019
Páginas: 71-74
Congreso: Reunión Nacional de Cuaternario (15. 2019. Bilbao)
Tipo: Aportación congreso
Resumen
Fluvial paleovalleys provide critical data to study the temporal superposition of depositional environments during the Holocene postglacial sea-level rise. We study eight boreholes that reached bedrock and a short replicate extracted from the Oka Estuary (Urdaibai Biosphere Reserve, southeastern Bay of Biscay). Benthic foraminifera and grain size allowed for paleoenvironmental reconstructions and radiocarbon dates put the sediment into a temporal framework.The sedimentary infill of the estuary shows a progressive shallowing of the estuary as rates of sea-level rise decreased during the Holocene: fluvial gravels on the bottom, marine and brackish intertidal sediments in the middle, and salt-marsh sediments on top. The sequence is topped by a few meters of anthropogenic deposits