Monte Tigre (Estancia La Costa): Santacrucian, Argentina

List of taxa
Where & when
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Megalonychidae
Eucholoeops ingens Ameghino 1887
De Iuliis et al. 2024 2 specimens
MPM-PV 15046 a nearly complete skull, with all teeth, and a fragmentary pelvis; MPM-PV 15086 a nearly complete skull, with its dorsal surface flattened, and the left zygomatic arch with the ascending process. It preserves the left Cf, the alveoli of the Mf1s, the left and right Mf2-Mf4, and, notably, the right ectotympanic. The mesial part of the left Cf and its alveolus are displaced slightly laterally. In addition, the specimen partially preserves other elements, such as an incomplete distal epiphysis of a femur, a fragment of a distal left fibula, and fragmentary vertebrae and ribs embedded in the matrix, which is hard, thus rendering their removal problematic.
Mammalia - Rodentia - Chinchillidae
Prolagostomus sp. Ameghino 1887
Vizcaíno et al. 2021
see common names

Country:Argentina State/province:Santa Cruz
Coordinates: 51.3° South, 69.0° West (view map)
Paleocoordinates:52.0° South, 63.3° West
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Period: Neogene Epoch: Miocene
Stage: Burdigalian 10 m.y. bin: Cenozoic 5
Key time interval: Santacrucian
Age range of interval: 17.4 - 16.2 m.y. ago
Formation:Santa Cruz Member:Estancia La Costa
Stratigraphic resolution:formation
Stratigraphy comments: The new Eucholoeops remains utilized in this report
derive from the intertidal Campo Barranca, Puesto Estancia La Costa, and Monte Tigre localities, all part of the Estancia La Costa Member. Although these localities are close in age, they are not contempo- raneous. Puesto Estancia La Costa is about 17.5 to 17.4 Ma (Kay et al. 2012). Monte Tigre and Campo Barranca are, respectively, stratigraphically higher (thus younger) and lower (thus older) than Puesto Estancia La Costa, but within the time span noted above. The location, extent, stratigraphy, lithology and chronology of these localities were discussed by Kay et al. (2008, 2012), Vizcaíno et al. (2010, 2012), Matheos & Raigemborn (2012), Perkins et al. (2012), and Fleagle et al. (2012).
Lithology and environment
Primary lithology: not reported
Environment:terrestrial indet.
Modes of preservation:body
Size of fossils:macrofossils,mesofossils
Collection methods and comments
Reason for describing collection:paleoecologic analysis
Database number:207742
Authorizer:P. Mannion Enterer:M. Kouvari, G. Varnham
Research group:vertebrate
Subset of collection #:27313
Created:2020-01-29 05:52:51 Last modified:2020-01-29 05:52:51
Access level:the public Released:2020-01-29 05:52:51
Creative Commons license:CC BY
Reference information

Primary reference:

71644. G. De Iuliis, F. Pujos, N. Toledo, M. S. Bargo, and S. F. Vizcaino. 2014. Eucholoeops Ameghino, 1887 (Xenarthra, Tardigrada, Megalonychidae) from the Santa Cruz Formation, Argentine Patagonia: implications for the systematics of Santacrucian sloths. Geodiversitas 36(2):209-255 [P. Mannion/M. Kouvari]

Secondary references:

88837 G. De Iuliis, M. S. Bargo, N. Toledo, L. J. S. Tsuji, and S. F. Vizcaíno. 2024. The Status of Eucholoeops fronto and E. lafonei (Xenarthra, Folivora, Megalonychidae) in the Systematics of the Early Miocene Eucholoeops (Santa Cruz, Argentina). Ameghiniana 61(1):45-69 [W. Gearty/W. Gearty]
86858 S. F. Vizcaíno, M. S. Bargo, R. F. Kay and M. S. Raigemborn. 2021. The record of the typothere Pachyrukhos (Mammalia, Notoungulata) and the Chinchillid Prolagostomus (Mammalia, Rodentia) in the Santa Cruz Formation (early–middle Miocene) south to the Río Coyle, Patagonia, Argentina. . Publicación Electrónica de la Asociación Paleontológica Argentina 21(2):1-15 [P. Mannion/G. Varnham]