FLORA Y PALEOCLIMA DE LA FORMACIÓN LA MESETA (EOCENO MEDIO), ISLA MARAMBIO (SEYMOUR), ANTÁRTIDA

• Main Authors: María A. Gandolfo, Sergio A. Marenssi, Sergio N. Santillana
• Format: Article in Journal/Newspaper
• Language: English; Spanish
• Published: Asociación Paleontológica Argentina 2015
• Subjects: Fossil man. Human paleontology; GN282-286.7; Paleontology; QE701-760; Antarctic; Antarctic Peninsula; isla Marambio; Marambio; Seymour; Seymour Island; The Antarctic; Antarc*; Antarctica; Antártida
• Online Access: https://doaj.org/article/8160ee2f00344f5b912dc72b499aaa03

New elements of the La Meseta Formation megaflora are described. This unit crops out on the northern third of Marambio (Seymour) Island, Antarctica. Fossil leaves were collected from the middle part of this formation, dated as middle Eocene. Although the fossils are not well preserved, we identified elements assignable to the following families: Nothofagaceae (at least 3 species), Dilleniaceae, Myricaceae, Myrtaceae, and Lauraceae. However, it was impossible to identify some of the fossils, although all could be recognized as dicotyledonous angiosperms. A palaeoclimatic interpretation based on physiognomic analysis (independent of the taxonomy of the elements) indicates temperate to cool temperate and seasonably moist climate for this formation. This interpretation reinforces the existence of a latitudinal gradient between the Antarctic Peninsula and South America and their progressive migration towards the north as consequence of climatic deterioration during the Eocene-Oligocene. KEY WORDS. Megaflora. Palaeoclimate. La Meseta Formation. Marambio Island. Antarctica. Middle Eocene.