Geol. acta Geol. acta Stratigraphy and sedimentology of distal-alluvial and lacustrine deposits of the western-central ebro basin (NE iberia) reflecting the onset of the middle miocene climatic optimum Larena Z. Arenas C. Universidad de Zaragoza Baceta J.I. Murelaga X. Suarez-Hernando O. 2020 research-article