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La Pastosa (Puerto Madryn Formation) (Miocene to of Argentina)

Also known as Peninsula Valdes

Where: Chubut, Argentina (42.8° S, 63.8° W: paleocoordinates 43.1° S, 60.5° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Puerto Madryn Formation, Middle Miocene to Middle Miocene (16.0 - 5.3 Ma)

• STRATIGRAPHIC POSITION: these outcrops correspond to the so-called “Rionegrense” (uppermost levels of the Puerto Madryn Formation or Río Negro Formation, according to different authors)

Environment/lithology: coastal; sandy, conglomeratic sandstone and conglomeratic shale

• The upper part of the Puerto Madryn Formation was accumulated in a shallow shelf paleoenvironment. In the studied interval the coquinas represent deposits of the shoreface, the heterolithic facies deposits of tidal flats and the large scale cross-stratified sandstones and intraformational conglomerates deposits of tidal channels. Scasso and del Río (1987)
• The section surveyed at this site is 26 m thick and consists of interstratified sandstones and shales forming hetherolithic facies, with intercalated coquinas and conglomerates.

Size class: macrofossils

Collection methods: surface (in situ),

• Museum repositories: Museo Paleontológico “Egidio Feruglio” (MPEF-PV,Trelew, Chubut, Argentina).

Primary reference: M. T. Dozo, P. Bouza, A. Monti, L. Palazzesi, V. Barreda, G. Massaferro, R.A. Scasso and C.P. Tambussi. 2010. Late Miocene continental biota in Northeastern Patagonia (Peninsula Valdes Chubut Argentina). Palaeogeography, Palaeoclimatology, Palaeoecology 297(1):100-109 [C. Jaramillo/C. Jaramillo/J. Carrillo] more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 122031: authorized by Carlos Jaramillo, entered by Carlos Jaramillo on 15.12.2011

Creative Commons license: CC BY (attribution)