Also known as above the “Faja Verde II”
Where: Salta, Argentina (25.7° S, 65.4° W: paleocoordinates 28.1° S, 56.2° W)
• coordinate stated in text
• small collection-level geographic resolution
When: Casamayoran mammal zone, Upper Member (Lumbrera Formation), Middle Eocene (47.8 - 37.7 Ma)
• Lumbrera Formation, above the “Faja Verde II” (Upper Lumbrera)
•Powell et al., 2011: Recently, geologic and paleontologic evidence allowed the correlation of the upper levels of Lumbrera with Geste, Casa Grande, and Quebrada de los Colorados Formations. Additionally, these levels were referred to the late-middle Eocene (Casamayoran SALMA -South American Land Mammal Age-, Barrancan subage) by an U/Pb dating of 39.9 Ma . The lower levels of the Lumbrera Formation are here referred to the Vacan subage of the Casamayoran SALMA.
•Fernicola et al. 2021 obtained an 238U-206Pb isochron age of 46.2 +/- 7.3 Ma for samples from the Lower Lumberer Fm, suggesting that the Lower section of the formation was deposited between 55–46Ma. "According to different authors, the fossiliferous levels of the lower section of the Lumbrera Fm. are equivalent to the Vacan Subage (del Papa et al. 2010; Powell et al. 2011; García-López et al. 2019). However, this biochronology is not supported by the absolute dating provided in this work. The top of the LSLF is now established by radioisotopy at 46. 2 ± 7.3 Ma (early Lutetian), and the record of the EECO and ETM2 in the first 150 m of the LSLF set the initial deposition of the sec- tion in the early Eocene (early Ypresian). With these new constraints, the species based on specimens recovered on the lower levels of the LSLF (this work) are chronologically equivalent to the Itaboraian SALMA (56.1–51.4 Ma; Woodburne et al. 2014; Krause et al. 2017)."
•The age of the Upper Lumbrera Formation has been estimated in 39.9 +/- 0.4 Ma (U/Pb zircon recovered from a tuff layer close to the upper contact, see del Papa et al., 2010). The age of the fossil is therefore considered as middle Eocene (Bartonian)
• bed-level stratigraphic resolution
Environment/lithology: lacustrine; green mudstone and red siltstone
Size class: macrofossils
Primary reference: D. A. García López and J. E. Powell. 2009. Un nuevo Oldfieldthomasiidae (Mammalia: Notoungulata) del Paleógeno de la provincia de Salta, Argentina. Ameghiniana 46(1):153-164 [P. Mannion/P. Mannion]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 132937: authorized by Philip Mannion, entered by Philip Mannion on 29.08.2012, edited by Richard Butler, Jelle Zijlstra and Grace Varnham
Creative Commons license: CC BY (attribution)
Taxonomic list
| Reptilia | |
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cf. Sebecus sp.4 Stirton 1953 crocodilian PVL 6386, almost complete articulated skull and mandibles, and three cervical vertebrae, exceptionally preserved.
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| Mammalia | |
? Utaetus magnum n. sp.3
? Utaetus magnum n. sp.3 Herrera et al. 2021 armadillo Holotype: IBIGEO-P 109, 11 fixed, two movables, and eight caudal complete osteoderms, in addition to numerous fragmentary osteoderms, all from the same individual
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Campanorco sp.4 Bond et al. 1984 notoungulate “Campanorco inauguralis”; PVL 6225, almost complete skull and upper dentition; IBIGEO-P 105
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Dolichostylodon saltensis n. gen. n. sp.
Dolichostylodon saltensis n. gen. n. sp. García López and Powell 2009 notoungulate PVL 6219 - holotype (partial skull)
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cf. Coquenia sp.4 Deraco et al. 2008 notoungulate PVL 6397, articulated specimen with complete skull and jaws, and the anterior third postcra- nial skeleton with almost complete forelimbs.
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