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Rincon Chico (Puerto Madryn Formation) (Miocene to of Argentina)

Also known as Peninsula Valdes

Where: Chubut, Argentina (42.8° S, 63.7° W: paleocoordinates 43.0° S, 60.4° 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 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 sedimentary section is exposed at a 40 m high inactive cliff. Part of the section is covered by recent eolian or mass-transported deposits located primarily in the basal section. Sandstones with shale intercalations or shale lenses dominate the profile. Part of the sequence also includes some conglomerate lenses and coquina levels similar to those in La Pastosa.

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 122079: authorized by Carlos Jaramillo, entered by Juan Carrillo on 16.12.2011

Creative Commons license: CC BY (attribution)