Resumen de El Pérmico inferior de la cuenca de Valdeviar (Sevilla, SW de España)

Robert Herman Wagner, Eduardo Jesús Mayoral Alfaro

• A non-marine basin of early Permian age extends in 33 km from NW to SE, with a reverse fault limiting the basin to the NE, whilst the SW side corresponds to a mild palaeotography. In the northern part of the basin the succession commences with local breccias followed by fluvial sandstones and conglomerates which are succeeded by wine red shales covered by 40 m of basalt flows lapping up against the palaeotopography. Further red beds are succeeded by some 40 m of volcanoclastic strata, locally covered by another basalt. Basin expansion towards the SE produced onlap of a higher succession of red beds. Facies developed from fluviatile to shallow lacustrine with increasing evidence of a drier climate as time progressed, with flash flood deposits originating from weathered material on hill slopes. Large fragments of woody trees were swept into the basin by mass flow. These were silicified, probably as a result of lingering volcanic influences. The explosive volcanism is traced to a volcanic complex at 3-5 km to the NE.

  The Permian sediments are flat-lying with the exception of a narrow strip next to the reserve fault to the NE, where drag took place.