Late Miocene continental biota in Northeastern Patagonia (Península Valdés, Chubut, Argentina)

Dozo, María Teresa; Bouza, Pablo José; Monti, Alejandro J.A.; Palazzesi, Luis; Barreda, Viviana; Massaferro, Gabriela Isabel; Scasso, Roberto A.; Tambussi, Claudia Patricia

doi:10.1016/j.palaeo.2010.07.018

Cited by 48 publications

(34 citation statements)

References 21 publications

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“…Overall, these data suggest a late Miocene open-landscape, probably warmer than today at the same latitude. As mentioned earlier, sedges and bulrushes were also frequent during these times, indicating the presence of humid spots (for example, ponds or permanently saturated soils), where some locally extinct mammals lived, including the Hydrochoeridae (for example, capybaras) 16 .…”

Section: Discussionsupporting

confidence: 52%

Fossil pollen records reveal a late rise of open-habitat ecosystems in Patagonia

Palazzesi

Barreda

2012

Nat Commun

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The timing of major turnovers in terrestrial ecosystems of the Cenozoic Era has been largely interpreted from the analysis of the assumed feeding preference of extinct mammals. For example, the expansion of open-habitat ecosystems (grasslands or savannas) is inferred to have occurred earlier in Patagonia than elsewhere because of the early advent of highcrowned teeth (hypsodont) mammals B26 Ma ago. However, the plant fossil record from Patagonia implies another evolutionary scenario. Here we show that the dominance of key open-habitat species-amaranths, Ephedra, asters and grasses-occurred during the last 10 Ma, about 15 Ma later than previously inferred using feeding/habitat ecology of extinct mammals. This late rise of open-landscapes in southern South America brings into question whether the expansion of open-habitat vegetation could have been the prime factor of highcrowned mammal diversification.

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Section: Discussionsupporting

confidence: 52%

Fossil pollen records reveal a late rise of open-habitat ecosystems in Patagonia

Palazzesi

Barreda

2012

Nat Commun

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“…2c) along the Uruguay River under mesothermal (MTCQ between 14°C and 16°C), relatively humid (AP ¼ 1,200 mm) and windless conditions. Further palaeontological data provides additional evidence to the late Miocene estimated climate: the occurrence of fossil capybara (Hydrochoerus hydrochaeris) remains preserved in the studied fossil pollenbearing deposits 16 . Today capybara extends from Venezuela to central-eastern Argentina and occupies riparian forest and seasonally flooded savannas.…”

Section: Discussionmentioning

confidence: 85%

Fossil pollen records indicate that Patagonian desertification was not solely a consequence of Andean uplift

et al. 2014

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The Patagonian steppe-a massive rain-shadow on the lee side of the southern Andes-is assumed to have evolved B15-12 Myr as a consequence of the southern Andean uplift. However, fossil evidence supporting this assumption is limited. Here we quantitatively estimate climatic conditions and plant richness for the interval B10-6 Myr based on the study and bioclimatic analysis of terrestrially derived spore-pollen assemblages preserved in well-constrained Patagonian marine deposits. Our analyses indicate a mesothermal climate, with mean temperatures of the coldest quarter between 11.4°C and 16.9°C (presently B3.5°C) and annual precipitation rarely below 661 mm (presently B200 mm). Rarefied richness reveals a significantly more diverse flora during the late Miocene than today at the same latitude but comparable with that approximately 2,000 km further northeast at mid-latitudes on the Brazilian coast. We infer that the Patagonian desertification was not solely a consequence of the Andean uplift as previously insinuated.

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“…La edad de los depósitos de la transgresión Entrerriense en el noreste de la Patagonia ha sido definida como Mioceno tardío basada principalmente en su contenido fosilífero (Feruglio, 1949;del Río, 2004;Palazzesi & Barreda, 2004;Cione et al, 2005;Dozo et al, 2010). Dataciones por el método 87 Sr/…”

Section: Introductionunclassified

Bioestratigrafía basada en quistes de dinoflagelados del Neógeno en el noreste de la Patagonia, Argentina

Fuentes¹,

Guler²,

Cuitiño³

et al. 2016

Rev. bras. paleontol.

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-BIOSTRATIGRAPHY BASED NEOGENE DINOFLAGELLATE CYSTS IN NORTHEAST OF PATAGONIA,ARGENTINA. This paper presents the biostratigraphic results based on dinoflagellate cysts from two Neogene lithostratigraphic units cropping out in northeastern Patagonia. The Barranca Final Formation, located in the southwestern Colorado Basin, is exposed along the northern coast of San Matías Gulf, Río Negro Province, and the Puerto Madryn Formation in the Península Valdés, Chubut Province. The low-to-moderate diverse dinoflagellate cyst assemblages present are dominated by neritic taxa with subordinate oceanic indicators. Towards the top of both sections, the relative frequencies of the dinoflagellate cyts decrease, whereas acritarchs and continental palynomorphs proportions increase, indicating a shallowing upwards trend. The stratigraphic range of Labyrinthodinium truncatum truncatum in the lower part of the Barranca Final Formation indicate age between the late Burdigalian (ca. 16.5 Ma) and the late Tortonian (ca. 7.

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Late Miocene continental biota in Northeastern Patagonia (Península Valdés, Chubut, Argentina)

Cited by 48 publications

References 21 publications

Fossil pollen records reveal a late rise of open-habitat ecosystems in Patagonia

Fossil pollen records reveal a late rise of open-habitat ecosystems in Patagonia

Fossil pollen records indicate that Patagonian desertification was not solely a consequence of Andean uplift

Bioestratigrafía basada en quistes de dinoflagelados del Neógeno en el noreste de la Patagonia, Argentina

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