MUSEO ARGENTINO DE CIENCIAS NATURALES "BERNARDINO RIVADAVIA"
Unidad Ejecutora - UE
Fossil woods from the Cross Valley Formation (Paleocene of Western Antarctica): Araucariaceae-dominated forests
PUJANA, R.; MARENSSI, S.A; SANTILLANA, S
REVIEW OF PALAEOBOTANY AND PALYNOLOGY
ELSEVIER SCIENCE BV
Lugar: Amsterdam; Año: 2015 vol. 222 p. 56 - 56
Fossil woods from Paleocene sediments of the Cross Valley Formation (Seymour Island, Antarctic Peninsula) areanatomically studied in detail.We collected 64 samples represented almost exclusively by conifers (95%). Onlythree samples of not determinable angiosperm fossil wood were found. Preservation of the samples is oftenpoor and 52% of the samples were assigned to a fossil-species. The assemblage is dominated by Agathoxylon(Araucariaceae), particularly Agathoxylon antarcticus. Araucariaceae species are joined by Protophyllocladoxylon,Phyllocladoxylon and Cupressinoxylon. Forests dominated by Araucariaceae are unusual during the Cenozoic.The high dominance of Araucariaceae woods may be a reflection of soil conditions, weather and terrain elevation.Our study supports previous hypothesis that identified differences between the paleofloras in each side of theAntarctic Peninsula during the Paleocene.