Gateway to the Paleobiology Database
Sierra de Los Colorados (Pliocene of Argentina)

Where: La Rioja, Argentina (28.6° S, 68.2° W: paleocoordinates 28.7° S, 67.2° W)

• coordinate stated in text

• local area-level geographic resolution

When: Inferior Member (Toro Negro Formation), Early/Lower Pliocene (5.3 - 3.6 Ma)

• A tuff from the lower portion the lower member of the Toro Negro Formation was dated with the fission track method as 4.3 6 1.0 Ma (Tabbutt, 1986; Tabbutt

•et al., 1989).

•Re´ and Barredo (1993) described the local magnetostratigraphy

•for the exposures at Quebrada de la Troya (Fig.

•2). Figure 3 shows the correlation between the local magnetic

•polarity column (with the position of the sloth skeleton indicated)

•and the temporal geomagnetic scale (following Berggren

•et al., 1995). This magnetostratigraphic correlation permits a

•precise chronology for the deposition of the Toro Negro Formation,

•and places the age of the sloth skeleton between 3.11

•and 3.04 Ma.

Environment/lithology: fluvial; lithified mudstone

Size class: macrofossils

Reposited in the MLP

Primary reference: G. De Iuliis, G. Ré, and S. F. Vizcaíno. 2004. The Toro Negro Megatheriinae (Mammalia, Xenarthra: A new species of Pyramiodontherium and a review of Plesiomegatherium. Journal of Vertebrate Paleontology 24(1):214-227 [C. Jaramillo/J. Carrillo] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 157303: authorized by Carlos Jaramillo, entered by Juan Carrillo on 12.06.2014

Creative Commons license: CC BY (attribution)