Barda Negra 2: Colhuehuapian, Argentina
collected 2015

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Notoungulata - Interatheriidae
Protypotherium sinclairi Kramarz et al. 2015
synonym of Protypotherium columnifer
Mammalia - Rodentia - Neoepiblemidae
Doryperimys olsacheri Kramarz et al. 2015
see common names

Geography
Country:Argentina State/province:Neuquén
Coordinates: 39.0° South, 69.7° West (view map)
Paleocoordinates:39.8° South, 64.2° West
Basis of coordinate:stated in text
Geographic resolution:small collection
Time
Period:Neogene Epoch:Miocene
10 m.y. bin:Cenozoic 5
Key time interval:Colhuehuapian
Age range of interval:20.90000 - 17.40000 m.y. ago
Stratigraphy
Formation:Cerro Bandera
Stratigraphic resolution:group of beds
Stratigraphy comments: the fossil-bearing deposits of the Cerro Bandera Formation correlate with the Lower Faunal Zone in the Colhue Huapi Member of the Sarmiento Formation at Gran Barranca (south of Colhue Huapi Lake, central Patagonia), dated at 21.1–20.1 Ma (Dunn et al., 2013), the type section for the Colhuehuapian South American Land Mammal Age (SALMA).

nearly 25 m from the exposed base.
Lithology and environment
Primary lithology:paleosol/pedogenic,bentonitic,tuffaceous "volcaniclastic"
Includes fossils?Y
Lithology description: The Cerro Bandera Formation is 45 m-thick and consists of pyroclastic deposits showing evidence of fluvial rework- ing and/or pedogenesis, alternating with primary fall-out pyroclastic deposits, with abundant bentonitic horizons in the lower section and scant intercalated sandstones in the upper section. The abundant tuffaceous and tuffitic con- tents would have originated from discontinuous ash fall derived from Andean or sub-Andean volcanic centers. The origin of these deposits is associated with a fluvial environ- ment in an intermontane foreland basin; lacustrine deposits accumulated in the central, topographically lower areas of the paleovalleys, whereas paleosols accumulated in the marginal, higher areas. This depositional system resulted in marked lateral facies variations among the currently isolated exposures (Leanza and Hugo, 1997; Kramarz et al., 2005)
Environment:fluvial indet.
Geology comments: These outcrops represent the relicts of an old alluvial in-filling developed in small local valleys eroded into Late Cretaceous and Paleocene rocks (Leanza and Hugo, 1997;Kramarz et al., 2005).
whitish-greyish tuffaceous horizons, about six meters from the base of the stratigraphic sec- tion exposed in the area (similar rocks as BN1) located nearly 25 m from the exposed base.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils,mesofossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Museum repositories:MACN,MLP
Collection dates:2015
Metadata
Also known as:BN2
Database number:197284
Authorizer:P. Mannion Enterer:M. Kouvari
Modifier:M. Kouvari Research group:vertebrate
Created:2018-10-31 07:53:07 Last modified:2018-11-01 06:43:56
Access level:the public Released:2018-10-31 07:53:07
Creative Commons license:CC BY
Reference information

Primary reference:
67257. A. G. Kramarz, M. Bond, and M. Arnal. 2015. Systematic description of three new mammals (Notoungulata and Rodentia) from the Early Miocene Cerro Bandera Formation, Northern Patagonia, Argentina. Ameghiniana 52(6):585-597 [P. Mannion/M. Kouvari]