IBIGEO   22622
INSTITUTO DE BIO Y GEOCIENCIAS DEL NOA
Unidad Ejecutora - UE
artículos
Título:
New Late Pleistocene megafaunal assemblage with well-supported chronology from the Pampas of southern South America
Autor/es:
CARLOS AGUSTÍN SCANFERLA; RICARDO BONINI; LUCAS POMI; ENRIQUE FUCKS; ALEJANDRO MOLINARI
Revista:
QUATERNARY INTERNATIONAL
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdam; Año: 2012
ISSN:
1040-6182
Resumen:
<!--
/* Font Definitions */
@font-face
{font-family:"MS 明朝";
mso-font-charset:78;
mso-generic-font-family:auto;
mso-font-pitch:variable;
mso-font-signature:1 134676480 16 0 131072 0;}
@font-face
{font-family:"MS 明朝";
mso-font-charset:78;
mso-generic-font-family:auto;
mso-font-pitch:variable;
mso-font-signature:1 134676480 16 0 131072 0;}
@font-face
{font-family:Cambria;
panose-1:2 4 5 3 5 4 6 3 2 4;
mso-font-charset:0;
mso-generic-font-family:auto;
mso-font-pitch:variable;
mso-font-signature:-536870145 1073743103 0 0 415 0;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{mso-style-unhide:no;
mso-style-qformat:yes;
mso-style-parent:"";
margin-top:0cm;
margin-right:0cm;
margin-bottom:10.0pt;
margin-left:0cm;
mso-pagination:widow-orphan;
font-size:12.0pt;
font-family:Cambria;
mso-ascii-font-family:Cambria;
mso-ascii-theme-font:minor-latin;
mso-fareast-font-family:"MS 明朝";
mso-fareast-theme-font:minor-fareast;
mso-hansi-font-family:Cambria;
mso-hansi-theme-font:minor-latin;
mso-bidi-font-family:"Times New Roman";
mso-bidi-theme-font:minor-bidi;
mso-fareast-language:JA;}
.MsoChpDefault
{mso-style-type:export-only;
mso-default-props:yes;
font-family:Cambria;
mso-ascii-font-family:Cambria;
mso-ascii-theme-font:minor-latin;
mso-fareast-font-family:"MS 明朝";
mso-fareast-theme-font:minor-fareast;
mso-hansi-font-family:Cambria;
mso-hansi-theme-font:minor-latin;
mso-bidi-font-family:"Times New Roman";
mso-bidi-theme-font:minor-bidi;
mso-fareast-language:JA;}
.MsoPapDefault
{mso-style-type:export-only;
margin-bottom:10.0pt;}
@page WordSection1
{size:595.0pt 842.0pt;
margin:72.0pt 90.0pt 72.0pt 90.0pt;
mso-header-margin:35.4pt;
mso-footer-margin:35.4pt;
mso-paper-source:0;}
div.WordSection1
{page:WordSection1;}
-->
Late
Pleistocene outcrops exposed in Buenos Aires province, Argentina, represent one
of the most
informative
sources about the paleoecology of South American megafauna. However, there are
no
records
of an accurately dated carnivore-herbivore taphocenosis. This paper presents
preliminary
results
of a recent excavation at the margins of the Salado River, on sediments
attributed to the Luján
Formation
(Late PleistoceneeEarly Holocene). The fossiliferous strata consist of greenish
brown sandy clays deposited in a small paleopond environment that was filled by
fluvial sediments, exhibiting
abundant
organic matter, gypsum and carbonate concretions. Fieldwork yielded an
association of extinct large-sized mammals that include the horse Hippidion principale, the saber-tooth cat Smilodonpopulator (at least one adult and one
juvenile associated specimen), a giant ground sloth Megatherium americanum, and
the glyptodont Doedicurus clavicaudatus.
Four 14C dates were performed on organic matter (12,100 _ 100 14C BP), a femur
of S. populator (13,400 _ 200 14C
BP), and a cervical vertebra of Hippidion
principale (12,860 _ 120 14C BP), and a pelvis of D. clavicaudatus (12,380
_ 190 14C BP) situating the site within 12,500 and 13,500 years, approximately.
Remarkably, some of the recovered specimens exhibit conspicuous bone
modifications (furrows, pits, punctures, striations and crenulated margins)
attributed to the activity of a medium-large carnivore. The association between
bones of herbivore mammals with conspicuous modifications produced by a large
carnivore, and the presence of cub and adult remains of Smilodon, link this felid with at least part of the excavated
association.