Where: Río Negro, Argentina (41.7° S, 71.5° W: paleocoordinates 42.6° S, 65.5° W)

• coordinate estimated from map

When: Río Foyel Formation, Early/Lower Miocene (23.0 - 16.0 Ma)

• The stratigraphy and exact age of the Rio Foyel Formation is currently a matter of debate. The region has been tectonically deformed, and outcrop exposures are limited. Various conflicting interpretations have been made regarding the depositional environments) and the age of the Rio Foyel Formation, which are summarized within Casadio et al. (2004). Recent radiometric dating (U–Pb, LA-MC-ICPMS) of detrital zircons, including those presented in this study, resolves this disparity by indicating maximum depositional ages between ~22 and ~17 Ma for the Río Foyel, La Cascada, and equivalent units (Encinas et al., 2012, Bechis et al., 2012, Bechis et al., 2014, Orts et al., 2012). These data are supported by calcareous nannofossils from the Río Foyel Formation that indicate an early to middle Miocene age (Bechis et al., 2012, Bechis et al., 2014).

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified, massive, concretionary shale

Size class: macrofossils

Preservation: concretion

Collection methods: Repository: Museo Paleontologica de Bariloche (MPB)

Primary reference: R. S. Crawford. 2008. A new species of fossil homolid crab (Decapoda: Brachyura) from the Río Foyel Formation (Paleogene), Río Negro province, Argentina. Journal of Paleontology 82:835-841 [M. Clapham/M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 226363: authorized by Matthew Clapham, entered by Matthew Clapham on 01.07.2022

Creative Commons license: CC BY (attribution)