Contributions à la Paléontologie du Miocène Moyen continental du Bassin du Tage. IV - Charophytes - Póvoa de Santarém, Pêro Filho et Tremês

Abstract

Key-words: Charophytes - Middle Miocene - Tagus'basin This study on middle Miocene Charophytes from the Tagus'basin indicates the presence of two species. hitherto undescribed from these strata in Portugal. Correlation diagrams of height and width of gyrogonite demonstrate that the populations of Nitellopsis (Tectochara) elrusca from the localities Póvoa de Santarém and Pêro Filho are identical to that from La Grenatiere (Herault. France). The population of Lychnothamnus duplicicarinatus from Tremês is identical to that already known from Anwill (Switzerland). The age of this flora is therefore suggested as being the upper part of the middle Miocene. The results of Charophyte studies are in accordance with stratigraphical conclusions from previously conducted mammalian studies (Antunes and Mein). A table showing the distribution of species in the three portuguese localities is given.