Patricio Santamarina

Consejo Nacional de Investigaciones Científicas y Técnicas

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Augusto N. Varela

Universidad Nacional de La Plata

Viviana D. Barreda

Bernardino Rivadavia Natural Sciences Museum

Ari Iglesias

Consejo Nacional de Investigaciones Científicas y Técnicas

M. Sol Raigemborn

Universidad Nacional de La Plata

Sabrina Lizzoli

Consejo Nacional de Investigaciones Científicas y Técnicas

Valeria S. Pérez Loinaze

Centro Científico Tecnológico - San Juan

Sebastián Richiano

Centro Científico Tecnológico Patagónico

Damián Moyano‐Paz

Consejo Nacional de Investigaciones Científicas y Técnicas

Daniel G. Poiré

Universidad Nacional de La Plata

Ezequiel I. Vera

Bernardino Rivadavia Natural Sciences Museum

Cooperative Institutions

Consejo Nacional de Investigaciones Científicas y Técnicas

Centro Científico Tecnológico - San Juan

Centro Científico Tecnológico - Tucumán

Bernardino Rivadavia Natural Sciences Museum

Universidad Nacional de La Plata

University of Buenos Aires

Universidad Nacional del Sur

Smithsonian Tropical Research Institute

Centro Científico Tecnológico Patagónico

Centro Científico Tecnológico - Patagonia Norte

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Incursion of tropically-distributed plant taxa into high latitudes during the middle Eocene warming event: Evidence from the Río Turbio Fm, Santa Cruz, Argentina

Review of Palaeobotany and Palynology (2021)

Damián Andrés Fernández Patricio Santamarina Luis Palazzesi Marı́a Cristina Tellerı́a Viviana D. Barreda

Podocarpus

10.1016/j.revpalbo.2021.104510

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Citations (6)

Carbon Isotopic Signature and Organic Matter Composition of Cenomanian High-Latitude Paleosols of Southern Patagonia

Geosciences (2021)

Augusto N. Varela M. Sol Raigemborn Patricio Santamarina Sabrina Lizzoli Thierry Adatte

The Cenomanian Mata Amarilla Formation (MAF) in southern Patagonia (~55° S paleolatitude, Austral-Magallanes Basin, Argentina) is composed mainly of stacked fluvial deposits with intercalated paleosols, which document Cenomanian environments at high-paleolatitudes in the Southern Hemisphere. We performed a multiproxy study of the paleosols and sediments of the MAF in order to (1) understand the composition of the soil- and sediment-derived organic matter (OM), (2) apply carbon isotope stratigraphy as a tool to correlate patterns obtained from the MAF with existing marine and non-marine δ13Corg records worldwide, and (3) investigate the relationship between variations in spore-pollen assemblages of the MAF and the climatic conditions prevailing in the Cenomanian Southern Hemisphere. An integrated dataset was generated, including total organic carbon content, Rock-Eval pyrolysis data, stable isotope (δ13Corg) composition, and palynological data, combined with published paleosol-derived mean annual temperatures and mean annual precipitations. The results indicated that the OM preserved in the MAF paleosols allowed its use as a chemostratigraphic tool. The MAF δ13Corg curve showed the rather stable pattern characteristic for the Early to Late Cenomanian interval. The absence of the major positive carbon isotope excursion associated with oceanic anoxic event 2 provided an upper limit for the stratigraphic range of the MAF. The palynological data suggested the development of fern prairies during warmer and moister periods at the expense of the background gymnosperm-dominated forests. Overall, the multiproxy record provided new insights into the long-term environmental conditions during the Cenomanian in the high latitudes of the Southern Hemisphere.

Cenomanian

Paleosol

Chemostratigraphy

Palynofacies

10.3390/geosciences11090378

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Citations (7)

Palynofloras from the Maastrichtian Chorrillo Formation (Patagonia, Argentina): Paleoenvironmental and paleoclimatic implications

Palaeogeography Palaeoclimatology Palaeoecology (2025)

Valeria S. Pérez Loinaze Ezequiel I. Vera M. Sol Raigemborn Damián Moyano‐Paz Patricio Santamarina

10.1016/j.palaeo.2025.112764

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Citations (0)

Reconstruction of a deep-time critical zone in southern patagonia (mid-high paleolatitude) during the mid-cretaceous greenhouse

CATENA (2024)

Sabrina Lizzoli Augusto N. Varela M. Sol Raigemborn Sebastián Richiano Patricio Santamarina

Paleosol

Paleoclimatology

Hydrosphere

10.1016/j.catena.2024.108054

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Citations (2)

Palynology from the Cenomanian Mata Amarilla Formation, southern Patagonia, Argentina

Cretaceous Research (2019)

Patricio Santamarina Viviana D. Barreda Ari Iglesias Augusto N. Varela

Cenomanian

10.1016/j.cretres.2019.104354

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Citations (11)

Palynology from the Cenomanian Puesto El Moro Formation (Santa Cruz Province, Argentina)

Cretaceous Research (2024)

Patricio Santamarina Valeria S. Pérez Loinaze M. Sol González Estebenet M. Verónica Guler C. Discenza

Cenomanian

10.1016/j.cretres.2024.106055

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Citations (1)

Salvinialean megaspores in the Late Cretaceous of southern Patagonia, Argentina

Acta Palaeontologica Polonica (2018)

Patricio Santamarina Viviana D. Barreda Ari Iglesias Augusto N. Varela

We report here two megaspores species related to the aquatic ferns of the Order Salviniales from the Late Cretaceous Mata Amarilla Formation (Austral Basin), southern Santa Cruz Province, Argentina.We identified the species Arcellites disciformis and Balmeisporites cf.B. holodictyus.The presence of A. disciformis, in particular, is significant not only because it represents the first record for the Southern Hemisphere, indicating a bi-hemispheric distribution for the species, but also because it increases the diversity of this genus in Patagonia.The new findings of salvinialean megaspores highlight the importance of water ferns in the Late Cretaceous aquiferous enviroments of southern South America.The common occurrences of Arcellites and Balmeisporites, whether in shallow, fresh or brackish water facies, indicates aquatic paleoenvironment of the Mata Amarilla Formation, as was inferred also from the sedimentological evidence.Their presence also indicates that the lower and middle levels of the Mata Amarilla Formation can be attributed to the megaspore Zone M3 (Albian-Cenomanian) defined for the Cretaceous of Patagonia.

Megaspore

10.4202/app.00491.2018

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Citations (12)

Palynoflora from the La Anita Formation (Maastrichtian), Austral-Magallanes Basin, Argentina

Revista del Museo Argentino de Ciencias Naturales (2020)

Patricio Santamarina Viviana D. Barreda Damián Moyano‐Paz Camila Tettamanti Ari Iglesias

Here we describe the spore and pollen assemblages recovered from the La Anita Formation, Late Cretaceous, Austral-Magallanes Basin (~50°S). This unit shows a high diversity of spores, with subordinate gymnosperms (mainly represented by Podocarpaceae) and angiosperms (mainly represented by Proteaceae and Arecaceae). The abundance of these groups varies between the two fertile studied levels, being one dominated by ferns (mainly Cyathidites minor and Laevigatosporites ovatus ) and the other by gymnosperm ( Podocarpidites spp.). The presence of aquatic ferns ( Azollopsis ), diverse Podocarpaceae and key angiosperm taxa (such as Arecipites , Clavatipollenites , Dichastopollenites , and Spinizonocolpites ) is indicative of warm and hyper-humid conditions. The great abundance of Arecaceae and the presence of some key taxa ( e . g . Azollopsis sp., Ericipites scabratus , Peninsulapollis gillii, Proteacidites spp.) support a probable Maastrichtian age for the uppermost strata of the La Anita Formation. A multivariate statistical analysis here conducted showed that the La Anita Formation has its greatest similarity with the La Irene Formation (Maastrichtian from the Austral-Magallanes Basin). Both formations are also related with other coeval palynofloras from Patagonia and Antarctica.

Podocarpaceae

Gymnosperm

Arecaceae

Acritarch

Podocarpus

10.22179/revmacn.22.664

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Citations (10)

The fern Konijnenburgia alata in the mid-Cretaceous of Patagonia, and the Matoniaceae fossil record

Cretaceous Research (2018)

Mauro G. Passalia Ari Iglesias Augusto N. Varela Patricio Santamarina Daniel G. Poiré

Cenomanian