Paleontological study of the Quaternary tufas of Ocio (Álava, Miranda-Trebiño Basin)
DOI:
https://doi.org/10.55407/geogaceta108686Keywords:
paleoecology, quaternary, carbonates, microfossils, limnologyAbstract
This study illustrates and describes the microfossil assemblage recovered from carbonate silt and sand beds of the Quaternary tufas in Ocio (Inglares River Valley, Álava). The assemblage is composed of one charophyte species (Chara cf. hispida), up to 7 species of ostracods (abundant taxa are Herpetocypris brevicaudata, Paralimnocythere psammophila, Pseudocandona eremita and Ilyocypris gibba) and four gastropod taxa (Amullaceana balthica, Bithynia tentaculata, Planorbis planorbis and Helicella ordunensis). These microfossils indicate that the studied Ocio beds formed in shallow freshwater pools, with alkaline and oligo-mesotrophic water. This finding is consistent with fine-sized tufa and lime mud deposition in slow-flowing or still water areas within a low-slope stepped fluvial system.
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