FORAMINIFEROS BENTONICOS DE LA LOCALIDAD TIPO DE LA FORMACION LA DESPEDIDA (EOCENO, ISLA GRANDE DE TIERRA DEL FUEGO). PARTE I: TEXTULARIINA y MILIOLINA

Abstract

The sandy upper member of the La Despedida Fm. and the unconformable overling Tchat-Chii conglomerate are described in their typical locality and the general foraminiferal content is listed. The arenaceous (twenty species) and miliolids (nine species) are illustrated from the overall La Despedida Formation. The lower member contains the Elphidium saginatum FinIay assemblage with eighteen species of arenaceous foraminifers; the most frequent are: Spiroplectammina sp., Cyclammina incisa (Stache); Bathysiphon eocenicus Cushman and Hanna, Plectina elongata Cushman and Berrnúdez, and very scarce miliolids (seven species). Its uppermost part is barren and seems to be continental. The upper member contains the Cribrorotalia cf. C. tainuia (Dorreen) assemblage, late Middle-Late Eocene, where the arenaceous are scarce and miliolids abundant; the most frequent species are: Quinqueloculina striata d'Orb. and "Flintina" novozelandica Dorreen. On the all, there are at least nine species in common with New Zealand.