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Talismã, upper Purus River (Miocene of Brazil)

Where: Amazonas, Brazil (8.8° S, 68.8° W: paleocoordinates 9.1° S, 66.8° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Solimões Formation, Tortonian (11.6 - 7.2 Ma)

• "Latrubesse et al. (2007) suggested a Late Miocene age for the Solimo ̃es Formation. The snake material we studied was collected at the Talisma ̃ locality, which is considered by some authors as belonging to the Huayquerian- Montehermosan (Late Miocene/Pliocene) because of the presence of the rodents Potamarchus murinus and Neopliblema horridula (Santos et al., 1993; Negri, 2004). According to Santos and Negri (1993), the faunal set of xenarthrans (Tardigrada) suggests, on one hand, a probable affinity with the fauna of the Santacrucian Age of Argentina (Early-Middle Miocene) and, on the other, a relation with the Laventan Age of Colombia (Middle Miocene). According to Negri (2004; unpubl. data), the faunistic association of Tardigrada in this locality would indicate an older age, correlatable and close to the Laventan (13.5–11.8 Ma, Madden et al., 1997). Here, we follow the arguments of Latrubesse et al. (2007) and assume a probable Late Miocene age for the Solimo ̃es Formation." (Hsiou and Albino, 2009:613)

•Cozzuol 2006: The diachronic nature of the Mesopotamian assemblage was

•rejected by Cozzuol (1993) and, more recently and with more complete data, by Cione et al. (2000). Surprisingly, several authors still insist on the ‘mixed’ nature of the ‘Conglomerado os?´fero’ (Linares, 2004; Zucol et al., 2005). All specimens from the Mesopotamian come from the base of the Ituzaingo´ Formation and concentrate in discontinuous lenticular levels (probably channel filling) known as the ‘Conglomerado os?´fero’ (i.e. bone-bearing conglomerate), which lies on the marine Parana´ Formation with an erosional unconformity between them. Cione et al. (2000) show that there is no basis for considering the Mesopotamian mammals Montehermosan. The Mesopotamian shares with the Chasicoan 18 first generic occurrences (plus 2 more with doubts) and 28 (plus another possible 4) first generic occurrences with the typical Huayquerian. With the constraints imposed by the underlying Parana´ Formation, the upper section of which was dated by several biostratigraphic studies as early Late Miocene (early Tortonian), this information places the Mesopotamian associ- ation well in the Huayquerian SALMA time interval (9.0– 6.8 Ma, Flynn and Swisher, 1995). As shown subsequently, the affinities between the Acre assemblage and the Mesopotamian are very large.

•Santos et al 1993: :Idade Huayqueriense-Montehermosense, Mioceno superior-Plioceno do sudoeste do Estado do Amazonas, Brasil.

• group of beds-level stratigraphic resolution

Environment/lithology: fluvial-lacustrine; lithified, gypsiferous, muddy, silty mudstone and claystone

• dominated by fine sediments, mainly silts and clays, with gypsum and calcite veins in the lower part and manganese stains in the upper part, both probably diagenetic.

•"The section is dominated by fine sediments, mainly silts and clays, with gypsum and calcite veins in the lower part and manganese stains in the upper part, both probably digenetic. The deposits are characterized by massive bedding with no evident lamination. Two fossiliferous levels were found at 1.7 and 7 m above water level " (Hsiou and Albino, 2009:612).

Size class: macrofossils

Collected by Universidade Federal do Acre (UFAC) and Universidade Federal de Rondonia (UNIR)

Collection methods: surface (float), ,

Primary reference: M. A. Cozzuol. 2006. The Acre vertebrate fauna: Age, diversity, and geography. Journal of South American Earth Sciences 21:185-203 [M. Uhen/M. Uhen] more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 67386: authorized by Mark Uhen, entered by Mark Uhen on 17.11.2006, edited by Jason Head, Evangelos Vlachos, Juan Carrillo, Philip Mannion and Grace Varnham

Creative Commons license: CC BY (attribution)