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Estancia La Peninsular (Miocene of Argentina)

Where: Argentina (47.7° S, 70.4° W: paleocoordinates 48.4° S, 64.9° W)

• coordinate stated in text

When: Santa Cruz Formation, Santacrucian (17.5 - 16.3 Ma)

• "The sediments at Estancia La Peninsular were assigned by de Barrio et al. (1982, 1984) to the Santa Cruz Formation, Santacrucian SALMA (late early Miocene), an allocation also supported by Panza and Cobos (2001). Nevertheless, these authors did not report on any vertebrate fossils collected at this particular locality, although many vertebrate fossils have been recovered from other, scattered sedimentary deposits in the region (Bown and Fleage 1993; de Barrio et al. 1984; Rae et al. 1996). Because the tribe Neuryurini has not been reported from any of the very extensive Santacrucian (late early Miocene) and ‘‘Friasian’’ (middle Miocene) deposits from the Santa Cruz, Chubut, Rı´o Negro, or Neuque´n provinces, there is also the possibility of younger sediments at La Peninsular that have not been recognized. Further geological and paleontological research in this area is clearly warranted."

Environment/lithology: terrestrial; siltstone

• "According to de Barrio et al. (1984) and Panza and Cobos (2001), a succession of badlands is exposed near Estancia La Peninsular. These include a lower section with white yellowish siltstones and claystones (pelitic subfacies), with fine intercalated sandstones (massive sands subfacies) and very fine to fine tuffites. There is a gray conglomerate bank 0.80 m thick at the top of the section, gray, with siliceous and tuffaceous clasts, maximum diameter variable 1–4 cm. These strata are about 20 m thick, followed by about 10 m of claystone

•and siltstones, gray to yellowish."

•"The osteoderms were a surface find, recovered from the surface of eroded siltstone badlands during the course of prospecting for vertebrate fossils. While it is not possible to determine exactly where they derived from, there is no good reason to believe they did not erode from the adjacent sediments."

Size class: macrofossils

Primary reference: L. R. Gonzalez Ruiz, A. E. Zurita, J. Fleagle, G. J. Scillato-Yane, M. T. Dozo and M. Zamorano. 2011. The southernmost record of a Neuryurini Hoffstetter, 1958 (Mammalia, Xenarthra, Glyptodontidae). Palaontologische Zeitschrift 85(2):155-161 [M. Uhen/M. Shalap] more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 123879: authorized by Mark Uhen, entered by Margaret Shalap on 01.02.2012

Creative Commons license: CC BY (attribution)