Sierra Baguales: Burdigalian, Chile
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia
- Cariamiformes
- Cariamidae
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Cariamidae indet.
Bonaparte 1853
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Sallaberry et al. 2015 | ||||||
Mammalia
- Cingulata
- Propalaehoplophoridae
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Propalaehoplophorinae indet.
(Ameghino 1891)
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original and current combination Propalaehoplophoridae | |||||||
Mammalia
- Cingulata
- Chlamyphoridae
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Proeutatus informal sp. nov.
Ameghino 1891
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Proeutatus sp.
Ameghino 1891
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Mammalia
- Megalonychidae
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Megalonychidae indet.
Gervais 1855
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Mammalia
- Tardigrada
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Tardigrada indet.
(Latham and Davies 1795)
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replaced by Folivora | |||||||
Mammalia
- Astrapotheria
- Astrapotheriidae
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Astrapotheriinae indet.
Soria and Alvarenga 1989
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Astrapothericulus iheringi
(Ameghino 1899)
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Mammalia
- Notoungulata
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Notohippinae (aff. Notohippus) toxodontoides
Ameghino 1890
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Mammalia
- Notoungulata
- Toxodontidae
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Adinotherium sp.
Ameghino 1887
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Nesodon sp.
Owen 1846
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Mammalia
- Panameriungulata
- Proterotheriidae
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Proterotheriinae indet.
Ameghino 1885
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Paramacrauchenia scamnata
Ameghino 1902
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Mammalia
- Rodentia
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Adelphomys candidus
Ameghino 1887
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Mammalia
- Rodentia
- Neoepiblemidae
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Perimys incavatus
Ameghino 1902
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Mammalia
- Rodentia
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Cavioidea indet.
Fischer de Waldheim 1817
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Angiospermae
- Myrtales
- Onagraceae
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Onagraceae indet.
de Jussieu 1789
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Angiospermae
- Myrtales
- Myrtaceae
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Myrtaceae indet.
de Jussieu 1789
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Angiospermae
- Fagales
- Nothofagaceae
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Nothofagaceae indet.
Kuprianova 1962
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Angiospermae
- Proteales
- Proteaceae
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Proteaceae indet.
de Jussieu 1789
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Angiospermae
- Caryophyllales
- Chenopodiaceae
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Chenopodiaceae indet.
Ventenant 1799
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Angiospermae
- Asterales
- Asteraceae
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Asteraceae indet.
Berchtold and Presl 1820
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Angiospermae
- Poales
- Poaceae
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Poaceae indet.
Barnhart 1895
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Coniferales
- Podocarpaceae
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Podocarpaceae indet.
Endlicher 1847
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Polypodiopsida
- Cyatheales
- Cyatheaceae
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Cyatheaceae indet.
Kaulfuss 1827
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unclassified
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Skolithos sp.
Haldemann 1840
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see common names |
Geography
Country: | Chile | State/province: | Magallanes |
Coordinates: | 50.6° South, 72.5° West (view map) | ||
Paleocoordinates: | 51.4° South, 66.5° West | ||
Basis of coordinate: | estimated from map | ||
Geographic resolution: | outcrop |
Time
Period: | Neogene | Epoch: | Miocene |
Stage: | Burdigalian | 10 m.y. bin: | Cenozoic 5 |
Key time interval: | Burdigalian | ||
Age range of interval: | 20.44000 - 15.98000 m.y. ago |
Stratigraphy
Formation: | Santa Cruz | ||||
Stratigraphic resolution: | group of beds | ||||
Stratigraphy comments: The lithological correlation is also confirmed by detrital zircon ages (maximum age of 18.23±0.26 Ma) and a rich assemblage of terrestrial vertebrate fossils, biostratigraphically equivalent to a post- Colhuehuapian, pre-Santacrucian South American Land Mammal Age (SALMA) fauna, suggesting a range of 19 to 17.8 Ma
Santa Cruz Formation (first refered by Ameghino (1889) as the ‘Piso Santacruceño’ (Marshall, 1976; Vizcaíno et al., 2012a) and later formalized by Zambrano and Urien (1970)), but Keidel and Hemmer in 1931 refered to this formation in Chile as Palomares. The Santa Cruz Formation is exposed along the southern flank of Cerro Cono (Fig. 2), where it overlies the Estancia 25 de Mayo Formation with a conformable, gradational contact |
Lithology and environment
Primary lithology: | mudstone |
Secondary lithology: | sandstone |
Includes fossils? | Y |
Includes fossils? | Y |
Lithology description: The descriptions are very long, this is a sum up: Unit 1 has a total thickness of 32.7 m. Overlying an erosional contact at the base is a 0.7 m thick, reddish brown, trough cross-laminated, medium- to coarse-grained sandstone, in which the troughs are up to about 1 m wide. Unit 2 has an erosional basal contact overlain by a 0.5 m thick, dark brown, medium-grained sandstone showing high-angle planar cross-lamination and mi- nor trough cross-lamination indicating northwest- to east-flowing currents. Unit 3, with a total thickness of 13.3 m, has a 1.0 m thick conglomerate at the base with small (up to 1 cm), multi-coloured chert and quartz clasts, grading towards the east into sandy conglomerate. Unit 4 starts with a 1.9 m thick, whitish, medium- grained sandstone at the base, which is low-angle planar cross-laminated. Unit 5 is 8.6 m thick and commences with a 4.6 m thick, yellowish, clay-rich, fine- to medium-grained sandstone with upper flow regime horizontal lami- nation, rare trough cross-lamination and high-angle cross-lamination Unit 6 has an erosional basal contact and a total thickness of 4.6 m, which can be subdivided into 5 fining-upward sub-units (6a-e) separated by sharp to erosional contacts. Fossils come from units 1-7 | |
Environment: | fluvial indet. |
Geology comments: Santa Cruz Formation in this area was deposited in a continental, fluvial environment, as indicated by the abundance of terrestrial vertebrate fragments, Scoyenia including probable hymenopterid traces, multi-coloured (often reddish), blocky-weathering mudstones (Fig. 4) with occasional mud-cracks, and sandstones showing sedimentary structures such as trough, epsilon and high-angle planar cross-lamination (Fig. 5), with a more or less consistent paleocurrent direction towards the east-northeast |
Taphonomy
Modes of preservation: | body,trace |
Size of fossils: | macrofossils,mesofossils |
Collection methods and comments
Reason for describing collection: | general faunal/floral analysis |
Metadata
Database number: | 204203 | ||
Authorizer: | P. Mannion, M. Uhen | Enterer: | M. Kouvari, M. Uhen |
Modifier: | M. Kouvari | ||
Created: | 2019-09-03 04:39:48 | Last modified: | 2020-09-17 09:35:57 |
Access level: | the public | Released: | 2019-09-03 04:39:48 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
69983. | J. E. Bostelmann, J. P. Le Roux, A. Vásquez, N. M. Gutiérrez, J. L. Oyarzún, C. Carreño, T. Torres, R. Otero, A. Llanos, C. M. Fanning, and F. Hervé. 2013. Burdigalian deposits of the Santa Cruz Formation in the Sierra Baguales, Austral (Magallanes) Basin: Age, depositional environment and vertebrate fossils. Andean Geology 40(3):458-489 [P. Mannion/M. Kouvari] |
Secondary references:
77288 | M. Sallaberry, S. Soto-Acuña, R. Yury-Yáñez, J. Alarcón, and D. Rubilar-Rogers. 2015. Aves fósiles de Chile. Publicación Ocasional del Museo Nacional de Historia Natural, Chile 63:265-291 [M. Uhen/M. Uhen] |