Southern beech (Nothofagaceae) fossil leaves from the Río Turbio Formation (Eocene–?Oligocene), Santa Cruz Province, Argentina.

Panti, Carolina

doi:10.22179/revmacn.21.626

Cited by 5 publications

(3 citation statements)

References 35 publications

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“…We suggest a latest Eocene through Oligocene age (this work) for the upper Río Turbio Formation. This interpretation is also more compatible with paleobotanical data that suggest mesothermal conditions at high latitude, based on the abundance and diversity of fossilized Nothofagus morphotype leaf impressions and wood fragments (Hünicken, 1955;Panti, 2019;Pujana and Ruiz, 2019). Whereas the warm early to middle Eocene conditions in Patagonia 366 favored high tropical to subtropical (mega/mesothermal) plant diversity (Wilf et al, 2003;Panti, 2014Panti, , 2020, the late Eocene-Oligocene transition ushered forth increased diversification and abundance of meso-and microthermal floral elements across southern Gondwana, including the widespread dominion of genus Nothofagus (Acosta et al, 2014;Vento and Prámparo, 2018;Panti, 2019;Pujana and Ruiz, 2019).…”

Section: The Subaqueous Deltaic Lower Río Turbio Formation Contains Dsupporting

confidence: 83%

“…These depositional ages are compatible with middle Eocene age estimates from dinoflagellate cyst biozonation, ranging from 46-39 Ma (Zone I of González Estebenet et al, 2015;and RTF 1 and 2 from González Estebenet et al, 2017), leaf impressions, shark teeth, and marine invertebrate fossils recovered from these deposits (Griffin, 1991;Otero et al, 2013;Otero and Soto-Acuña, 2015;Panti, 2019Panti, , 2020. Moreover, these strata show similar age, sedimentary facies, fossil content, and mineral composition to those of its northern equivalent in the Man Aike Formation near Lago Argentino (Marenssi et al, 2002;Casadío et al, 2009;Rodríguez Raising, 2010;Cuitiño et al, 2019) and Sierra Baguales (Ugalde, 2014;Gutiérrez et al, 2017), pointing to stratigraphic correlation of a regional, renewed depositional phase of foreland sedimentation across the Paleocene unconformity surface (George et al, 2020).…”

Section: The Subaqueous Deltaic Lower Río Turbio Formation Contains Dsupporting

confidence: 78%

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Revised timing of Cenozoic Atlantic incursions and changing hinterland sediment sources during southern Patagonian orogenesis

Fosdick¹,

VanderLeest²,

Bostelmann³

et al. 2019

Preprint

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New detrital zircon U-Pb geochronology data from the Cenozoic Magallanes-Austral Basin in Argentina and Chile ~51°S establish a revised chronostratigraphy of Paleocene – Miocene foreland synorogenic strata and document the rise and subsequent isolation of hinterland sources in the Patagonian Andes from the continental margin. The upsection loss of zircons derived from the hinterland Paleozoic and Late Jurassic sources between ca. 60-44 Ma documents a major shift in sediment routing due to Paleogene orogenesis in the greater Patagonian-Fuegian Andes. Changes in the proportion of grains from hinterland thrust sheets, comprised of Jurassic volcanics and Paleozoic metasedimentary rocks, provide a trackable signal of long-term shifts in orogenic drainage divide and topographic isolation due to widening of the retroarc fold-thrust belt. Youngest detrital zircon U-Pb ages confirm timing of Maastrichtian – Eocene strata, but require substantial age revisions for part of the overlying Cenozoic basinfill during the late Eocene and Oligocene. The upper Río Turbio Formation, previously mapped as middle to late Eocene in the published record, records a newly recognized latest Eocene-Oligocene (37-27 Ma) marine incursion along the basin margin. We suggest that these deposits could be genetically linked to the distally placed units along the Atlantic coast, including the El Huemul Formation and the younger San Julián Formation, via an eastward deepening within the foreland basin system that culminated in a basin-wide Oligocene marine incursion in the Southern Andes. The overlying Río Guillermo Formation records onset of tectonically generated coarse-grained detritus ca. 24.3 Ma and a transition to the first fully nonmarine conditions on the proximal Patagonian platform since Late Cretaceous time, perhaps signaling a Cordilleran-scale upper plate response to increased plate convergence and tectonic plate reorganization.

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Section: The Subaqueous Deltaic Lower Río Turbio Formation Contains Dsupporting

confidence: 83%

Section: The Subaqueous Deltaic Lower Río Turbio Formation Contains Dsupporting

confidence: 78%

Revised timing of Cenozoic Atlantic incursions and changing hinterland sediment sources during southern Patagonian orogenesis

Fosdick¹,

VanderLeest²,

Bostelmann³

et al. 2019

Preprint

View full text Add to dashboard Cite

show abstract

“…For the systematics of each morphospecies, the proposed (APG IV, 2016) classification of angiosperms was followed. Taxonomic determinations were made through literature review and comparison of material from other taphofloras described for Patagonia and Antarctica (i.e., Berry, 1925, 1937; Caviglia, 2019; Caviglia & Zamaloa, 2014; Dusén, 1899; Dutra, 2001; Frenguelli, 1941; Hünicken, 1967; Panti, 2011, 2019; Tosolini et al., 2013; Vento et al., 2017).…”

Section: Methodsmentioning

confidence: 99%

Climate and Vegetation of the Miocene of Tierra del Fuego: Filaret Formation

Sandoval,

Yabe,

Nishida

et al. 2024

Paleoceanog and Paleoclimatol

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The changing climate during the Cenozoic affected the diversity of plants in Patagonia, as species richness tends to increase during warm periods and decrease during cold periods. Precipitation is a significant factor shaping diversity, as shown in the case of central Chile during the Miocene. This study presents a reconstruction of the climate and vegetation in Tierra del Fuego Island, located approximately 52°S, using fossil flora recovered from the Filaret Formation to understand the Miocene epoch, characterized by contrasting global climatic changes. Filaret flora comprises twenty‐seven morpho‐taxa, including nine Nothofagus species and other Gondwanan and Neotropical families, such as Atherospermataceae and Anacardiaceae, in agreement with a forest habitat. Leaf physiognomy climate reconstruction suggests microthermal conditions, with a mean annual temperature of 9.4–11°C and annual precipitation ranging from 985 to 1,130 mm. These conditions are warmer and wetter than the modern record of the area, with a MAT of 6°C and mean annual precipitation of 300 mm. As the Filaret fossil record suggests, the forest habitat under a microthermal climate is consistent with the global climatic reconstruction of the Early Miocene. This Miocene landscape on Tierra del Fuego was possible because the Andes could not rain‐shadow humid westerly winds by this timeframe.

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The micro- and megafossil record of Nothofagaceae from South America

Pujana

Fernández

Panti

et al. 2020

Botanical Journal of the Linnean Society

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We compiled the numerous fossil records (486) assigned to Nothofagaceae including pollen grains (from surface sediments and continental and oceanic borehole cores), leaves, woods and reproductive structures from South America. All the records are revised and the latest systematic treatments and ages of the bearing strata of each record are followed. When possible, we proposed a subgeneric affinity to each record based on updated bibliography. Fossils of three (Nothofagus, Fuscospora and Lophozonia) of the four subgenera are found in similar proportions through time since the Late Cretaceous. Fossils with reliable affinity with subgenus Brassospora were not found in South America. Most of the records are concentrated in the southern tip of South America (Patagonia Region) and nearby areas. After a significant presence of Nothofagaceae in the Cretaceous, the family declined in diversity and abundance in the Palaeocene and then increased from the Eocene to the Miocene. In the Miocene, the records reach their maximum diversity and abundance, and Nothofagaceae usually dominate the assemblages of pollen, leaves and woods from Patagonia. Pliocene Nothofagaceae records are virtually absent, probably because sedimentary rocks of that age are rare in Patagonia. The fossil record for Nothofagaceae varies according to environmental turnover; when tropical/subtropical floras were present in Patagonia in the Palaeocene–early Eocene, Nothofagaceae contracted southwards and when open steppes developed in the Miocene of east Patagonia, Nothofagaceae contracted westward.

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Southern beech (Nothofagaceae) fossil leaves from the Río Turbio Formation (Eocene–?Oligocene), Santa Cruz Province, Argentina.

Cited by 5 publications

References 35 publications

Revised timing of Cenozoic Atlantic incursions and changing hinterland sediment sources during southern Patagonian orogenesis

Revised timing of Cenozoic Atlantic incursions and changing hinterland sediment sources during southern Patagonian orogenesis

Climate and Vegetation of the Miocene of Tierra del Fuego: Filaret Formation

The micro- and megafossil record of Nothofagaceae from South America

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