Upper Albian Transgressive marine deposits in the terrigenous series of the "Páramo de la Lora" (northern side, Cantabria and Palencia, Spain)

The Lower Cretaceous series of the northern side of the "Páramo de la Lora" is mainly continental fluvial. A detailed analysis of the section outcropping between Cuillas del Valle and Olleros de Paredes Rubias, has revealed fades which can be attributed to transitional continental-marine enviroments. These are horizontally bedded sandstones with oscillation ripples (lagoon and shoreface), and cross-stratified sandstones with backset laminae (tidal). Other cross-stratified sandstones (fluvial channels), laminated lutites (alluvial coastal plain), bivalve sandstones (tidal ?) and lutites with leaves (marsh), make up contemporaneously-related subenvironments. Storm wave action prevailed during the filling of a narrow erosional depression, and tidal action accompanied the later establishment of valleywide sedimentary condition