El Triásico medio en facies Muschelkalk de Jalance (Valencia, Cordillera Ibérica meriodional)

Abstract

The stratigraphical and sedimentological study of the Middle Triassic represented in Muschelkalk facies in the Jalance area (Valencia), SE Iberian Ranges, allows to separate three different lithostratigraphical units here denominated lower, middle and upper unit. The lower unit is 82 m thick, and mainly consists of mudstone to packstone decimetric beds with irregular lamination and grey dolomites with cross-stratification, ripples and stromatolite thin beds. It is interpreted as the evolution from subtidal to intertidal environments. The middle unit is partially exposed and presents green marls and clays with intercalated thin gypsum levels that represents supratidal environments. The upper unit is 79 m thick and constituted by grey fine-bedded dolomites with cross-stratification, dark and nodular wackestones-packstones decimetric beds and fine laminated alternating beds of green marls and yellow wackestones interpreted as the evolution from subtidal to supratidal environments. A correlation with neighbouring sections permits us to consider the studied section as typical of the "Iberian Triassic-type" but very near to the transition to the "Levantine-Balear-type" Triassic.