Cerro Rucañanco (Miocene of Chile)

Where: Malleco, Chile (38.7° S, 71.2° W: paleocoordinates 39.2° S, 67.5° W)

• coordinate stated in text

• local area-level geographic resolution

When: Rio Pedregoso Member (Cura-Mallin Formation), Serravallian (13.8 - 11.6 Ma)

• Text comments only state that the fossil comes from the upper member. Figure 1 describes such member as the Rio Pedregoso Member. The detailed stratigraphy of the area, which represents a fluvio-lacustrine environment, has been provided by Suarez and Emparan (1988, 1995).

•However, the fossil-bearing sections of Piedra Parada, Puente Tucapel, and Cerro Solarzano et al., 2019: Rucañanco probably have ages close to 12.8–11.64 Ma (Serravallian; Fig. 2), because the available detrital zircons maximum ages could be interpreted as near-sedimentation ages.

•Pedroza et al. 2017 proposed a new stratigraphic scheme that would move Cura-Mallin to group level, Rio Pedregoso to Formation level, and as a result this locality would fall under the Rucañanco member, but this scheme has yet to reviewed comprehensively.

• member-level stratigraphic resolution

Environment/lithology: fluvial-lacustrine; sandstone and conglomerate

• The detailed stratigraphy of the area, which represents a fluvio-lacustrine environment, has been provided by Suarez and Emparan (1988, 1995).
• Composed mainly of sandstones and conglomerates

Size class: macrofossils

Primary reference: H. M. F. Alvarenga. 1995. A large and probably flightless anhinga from the Miocene of Chile. Courier Forschungsinstitut Senkenberg 181:149-161 [M. Uhen/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 137122: authorized by Carlos Jaramillo, entered by Gustavo Ballen on 10.12.2012, edited by Grace Varnham and Mark Uhen

Creative Commons license: CC BY (attribution)

Taxonomic list

Mammalia
 Cingulata - Dasypodidae
Eutatini indet.3 armadillo
SGO.PV.22476
 Panameriungulata - Macraucheniidae
Theosodon sp.3 Ameghino 1887 placental
SGO.PV.4000
Aves
 Suliformes - Anhingidae
Meganhinga chilensis n. gen. n. sp.
Meganhinga chilensis n. gen. n. sp. Alvarenga 1995 darter
Amphibia
 Salientia - Bufonidae
cf. Rhinella sp.2 Fitzinger 1826 toad
SGO.PV.22205, distal half of a left humerus in natural articulation with the proximal half of radioulnae
Actinopteri
 Siluriformes - Nematogenyidae
Nematogenys cuivi n. sp.1 Azpelicueta and Rubilar 1998 catfish
CPUC Lonq (R)/7 (holotype); CPUC Lonq (R)/9, CPUC Lonq (R)/10 (paratypes)