Inferencias paleoclimáticas a partir del estudio de los anillos de crecimiento de leños fósiles de la Formación Río Turbio, Santa Cruz, Argentina.I: Nothofagoxylon paraprocera Ancibor, 1990

BREA, M.

AMEGHINIANA

ASOCIACION PALEONTOLOGICA ARGENTINA

Lugar: Buenos Aires; Año: 1993 vol. 30 p. 135 - 141

0002-7014

Dendrochronologic methods have been used to study fossil woods of Nothofagoxylon paraprocera Ancibor 1990, from the Rio Turbio Formation, Santa Cruz, province Argentina. Analyses of well preserved growth pattems have yielded information about growth periodicity. Increase of annual growth is variable (0,45 - 3,53 rnm). The values of medium sensibility are found to develop between normallimits; this and the low correlation allows to suggest that the dendrochronologic features of these trees are similar to extant ones, growing near the fossiliferous locality of Rio Turbio. N. paraprocera lived under temperate, strongly seasonal, weather conditions. These conditions preveiled in the area during part of the Eocene, allowing the development of a community that occupied topographycally higher ecological niches.