INVESTIGADORES
ZURITA Alfredo Eduardo
artículos
Título:
Preliminar correlation of the Pleistocene sequences of the Tarija valley (Bolivia) with the pampean chronological standard
Autor/es:
TONNI, E. P.; SOIBELZON, E.; CIONE, L. H.; CARLINI, A. A; SCILLATO-YANÉ, G. J.; ZURITA, A. E; PAREDES-RIOS, F.
Revista:
QUATERNARY INTERNATIONAL
Editorial:
ELSEVIER
Referencias:
Lugar: London; Año: 2009 p. 57 - 65
ISSN:
1040-6182
Resumen:
Most of the mammal collections of the Pleistocene from the Tarija valley (Bolivia) lack precise stratigraphic
data. Some fossil collections were made under stratigraphic control but have not been described.
However, mammals were used for correlation and comparison with the pattern established for the
Pampean region of Argentina. The bearing units have been referred either to the Ensenadan and
Bonaerian stages, the Belgranan, the Ensenadan, or the Lujanian in a broad sense, corresponding to the
middle-upper Pleistocene or the upper Pleistocene. Studies during the last twenty five years accomplished
by American authors and based on magnetostratigraphy and absolute dating suggest that the
Tarija sequence corresponds to the Ensenadan (early-middle Pleistocene) of the Pampean standard.
Recently, Italian scientists, based on radiometric dating, discarded this age and considered that the whole
sequence belongs to the late Pleistocene. New biostratigraphic and systematic studies allowed the
recognition of Glyptodon munizi, Arctotherium angustidens, and Hippidion devillei, exclusive taxa of theGlyptodon munizi, Arctotherium angustidens, and Hippidion devillei, exclusive taxa of the
Mesotherium cristatum Biozone, the biostratigraphic base for the Ensenadan of the Pampean region.
However, collections include mostly putative endemic species or those characteristic of the EquusBiozone, the biostratigraphic base for the Ensenadan of the Pampean region.
However, collections include mostly putative endemic species or those characteristic of the EquusEquus
(Amerhippus) neogaeus Biozone, the biostratigraphic base for the Lujanian of the Pampean area. In sum,
from a biostratigraphic point of view, the Tarija sequence has taxa from the lower to middle Pleistocene
(Ensenadan) and the upper Pleistocene-lower Holocene (Lujanian) of the Pampean area. From a paleofaunistic
standpoint, the association recovered from the Tarija valley shows significant differences with
the typical Pampean association. The high frequency of remains of Gomphotheriidae and Equidae and, in
lower proportion, of Hydrochoeriidae and Tapiridae, are noteworthy. Members of these two latter
families are restricted today to warm and wet climates. Most Glyptodontidae records belong to Glyptodon,
and in the Pampean region this family is much more diversifiedAmerhippus) neogaeus Biozone, the biostratigraphic base for the Lujanian of the Pampean area. In sum,
from a biostratigraphic point of view, the Tarija sequence has taxa from the lower to middle Pleistocene
(Ensenadan) and the upper Pleistocene-lower Holocene (Lujanian) of the Pampean area. From a paleofaunistic
standpoint, the association recovered from the Tarija valley shows significant differences with
the typical Pampean association. The high frequency of remains of Gomphotheriidae and Equidae and, in
lower proportion, of Hydrochoeriidae and Tapiridae, are noteworthy. Members of these two latter
families are restricted today to warm and wet climates. Most Glyptodontidae records belong to Glyptodon,
and in the Pampean region this family is much more diversifiedGlyptodon,
and in the Pampean region this family is much more diversified