Rincon Chico (Puerto Madryn Formation) Peninsula Valdes (Miocene of Argentina)

Also known as Marine cliffs between Punta Delgada & Punta Lobo (3/5 km W of Punta Delgada)

Where: Chubut, Argentina (42.8° S, 63.7° W: paleocoordinates 43.0° S, 61.0° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: upper levels Member (Puerto Madryn Formation), Tortonian (11.6 - 7.2 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)

•

•Dozo et al 2010 & Vucetich et al 2005: upper levels of the Puerto Madryn Fm.

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)

Taxonomic list

• The collection contains continental vertebrate biota only.
Show authors, comments, and common names
Mammalia
 Cingulata -
Neuryurini indet.
Neuryurini indet. Hoffstetter 1958 edentate
 Cingulata - Pampatheriidae
"Scirrotherium carinatum" = Kraglievichia carinatum
"Scirrotherium carinatum" = Kraglievichia carinatum Gois et al. 2013 edentate
  - Mylodontidae
Mylodontinae indet.
Mylodontinae indet. Gill 1872 edentate
 Rodentia - Hydrochoeridae
Cardiatherium patagonicum n. sp.
Cardiatherium patagonicum n. sp. Vucetich et al. 2005 caviomorph
 Rodentia - Caviidae
Dolichotinae indet.
 Rodentia - Chinchillidae
"Lagostomopsis indet." = Lagostomus (Lagostomopsis)
"Lagostomopsis indet." = Lagostomus (Lagostomopsis) Kraglievich 1926 viscacha
 Panameriungulata - Macraucheniidae
Macraucheniidae indet.
Macraucheniidae indet. Ameghino 1889 placental
Aves
 Anseriformes - Anatidae
Dendrocygninae indet.
Dendrocygninae indet. Reichenbach 1850 whistling duck
 Gruiformes - Phorusrhacidae
Psilopterinae indet.
Psilopterinae indet. Dolgopol de Saez 1927 terror bird
Actinopteri
 Acanthomorphata -
Percomorpha indet.
 Teleostei -
Siluriformes indet.
 Siluriformes - Loricariidae
Loricariidae indet.
Loricariidae indet. Gill 1872 catfish