Stratigraphic distribution of Valanginian–Early Aptian shallow-water benthic foraminifera and algae, and depositional sequences of a carbonate platform in a tectonically-controlled basin: the Organyà Basin, Pyrenees, Spain

The Early Cretaceous Urgonian platform carbonates of the Organyà Basin are divided into five depositional sequences for which a foraminiferal distribution chart has been plotted. Each depositional sequence is characterised by its faunal content: Zergabriella embergeri, Valdanchella miliani and Pfenderina neocomiensis characterise sequence OR-0, which is Valanginian in age; Cribellopsis neoelongata characterises the upper part of sequence OR-1; Valserina bronnimanni, Eopalorbitolina charollaisi and Palorbitolina lenticularis characterise sequence OR-2; and Neotrocholina friburgensis characterises sequence OR-3, all of which are Late Barremian; andPalorbitolina lenticularis , the rudist species Pachytraga paradoxa and planktonic foraminifera from theGlobigerinelloides blowi Zone characterise sequence OR-4, which is probably Early Aptian. Other species characteristic of the Hauterivian–Early Barremian have not been found in these sediments. There is probably an important sedimentary gap spanning the interval between OR-0 and OR-1 depositional sequences within the Organyà carbonates.