INVESTIGADORES
ACEÑOLAZA Pablo Gilberto
artículos
Título:
Macrofloristic assemblage of the Paraná Formation (Middle-Upper Miocene) in Entre Rios (Argentina)
Autor/es:
ANZÓTEGUI, L AND P. ACEÑOLAZA
Revista:
NEUES JAHRBUCH FUR GEOLOGIE UND PALAONTOLOGIE-ABHANDLUNGEN
Editorial:
E SCHWEIZERBARTSCHE VERLAGS
Referencias:
Año: 2008 vol. 248 p. 159 - 170
ISSN:
0077-7749
Resumen:
The Paraná Formation represents the marine ingression of Middle-Upper
Miocene that invaded the Pampean plain and parts of Argentinean
Mesopotamia. In its outcroppings, an abundant fossil fauna and flora
(palynomorphs, logs, foliar impressions and phytoliths) have been
recognized. In Villa Urquiza locality (Entre Ríos Province, Argentina),
the outcropping strata are constituted by white sands intermingled with
pure clays, gray to grayish-green, with abundant diagonal and flat
structures including paleochannels filled with clays. In this study,
foliar impressions such as Myrciophyllum paranaesianum sp. nov.; Laurophyllum
sp. (Lauraceae), and Schinus aff. terebinthifolia
(Anacardaicaeae) are described. The assignment of Laurophyllum
and Myrciophyllum and the existence of xerophytic forests are
discussed. Taking into account both the habit and habitat of recent
plant species related to the fossil material, it is concluded that
forests with Podocarpaceae and Araucariaceae existed in higher altitude
zones, represented by fossils in the marine environment of the Paraná
Formation. It is considered that these species were part of a
heterogeneous environment with highlands and flooded lowlands, as part
of the Seasonally Dry Neotropical Forest. The climate would have been
warm and humid and among the environmental units; there were
hydrophylous and mesophylous forests, marshy environments, lentic and
lotic aquatic communities. Considering plant leaf impressions and the
communities they may represent, vegetation of the Paraná Formation is
interpreted to be consistent with the Neotropical Paleophytogeographic
Province.