Contenido micropaleontológico de las arenas dunares de Noja (Cantabria)

A total of 45 species of benthic foraminifers and 8 of ostracods have been studied from the sandy sediment of dunes from Noja (Cantabria, Spain). Dominant assemblages are formed by the species Lobatula lobatula and Cibicides refulgens, accompanied by Quinqueloculina seminula, Rosalina globularis and Textularia sagittula (foraminifers) and by Loxoconcha elliptica and Caudites calceolatus (ostracods). Since those species are present in the Noja beaches or are occurring as thanatocoenotic specimens transported from the marine shelf, we can propose that the sediment of the dunes is originated in the beaches, and accumulated by dominant winds from the NW. In the dunes of the Trengandin beaches the further occurrence of individuals of euryhaline species, such as Ammonia tepida at the base of the dunes, suggests the existence of sources of water coming from the karstic urgonian limestones of the outcrops in the area.