{"title":"Palynostratigraphy from the Allen and Jagüel formations at the Cerro Gutiérrez locality, Lago Pellegrini area, South Argentina","authors":"Egly Pérez Pincheira , Alberto Carlos Garrido","doi":"10.1016/j.jsames.2024.105139","DOIUrl":null,"url":null,"abstract":"<div><p>This work provides new stratigraphic information from the Allen and Jagüel formations (Neuquén Basin) at the Cerro Gutiérrez locality, Río Negro province. The distribution of palynomorphs allowed the definition of two palynologic assemblages: A1 corresponding to the Allen Formation, and A2 from the Jagüel Formation. The presence of taxa such as <em>Catinipollis geiseltalensis</em>, <em>Gabonisporis vigorouxii</em>, <em>Nevesisporites vallatus</em>, <em>Callialasporites</em>, <em>Gemmamonocolpites</em>, and <em>Quadraplanus brossus</em> suggests a Maastrichtian age. Due to the presence in A1 of <em>Quadraplanus brossus</em>, which range is Late Maastrichtian in Australia, New Zealand, and Antarctica, the age of the middle member of the Allen Formation, previously considered Late Campanian, could now be assigned to Late Maastrichtian. The palynoflora of the locality corresponds to the transitional paleoflora.</p></div>","PeriodicalId":50047,"journal":{"name":"Journal of South American Earth Sciences","volume":"148 ","pages":"Article 105139"},"PeriodicalIF":1.7000,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of South American Earth Sciences","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0895981124003614","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
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Abstract
This work provides new stratigraphic information from the Allen and Jagüel formations (Neuquén Basin) at the Cerro Gutiérrez locality, Río Negro province. The distribution of palynomorphs allowed the definition of two palynologic assemblages: A1 corresponding to the Allen Formation, and A2 from the Jagüel Formation. The presence of taxa such as Catinipollis geiseltalensis, Gabonisporis vigorouxii, Nevesisporites vallatus, Callialasporites, Gemmamonocolpites, and Quadraplanus brossus suggests a Maastrichtian age. Due to the presence in A1 of Quadraplanus brossus, which range is Late Maastrichtian in Australia, New Zealand, and Antarctica, the age of the middle member of the Allen Formation, previously considered Late Campanian, could now be assigned to Late Maastrichtian. The palynoflora of the locality corresponds to the transitional paleoflora.
期刊介绍：
Papers must have a regional appeal and should present work of more than local significance. Research papers dealing with the regional geology of South American cratons and mobile belts, within the following research fields:
-Economic geology, metallogenesis and hydrocarbon genesis and reservoirs.
-Geophysics, geochemistry, volcanology, igneous and metamorphic petrology.
-Tectonics, neo- and seismotectonics and geodynamic modeling.
-Geomorphology, geological hazards, environmental geology, climate change in America and Antarctica, and soil research.
-Stratigraphy, sedimentology, structure and basin evolution.
-Paleontology, paleoecology, paleoclimatology and Quaternary geology.
New developments in already established regional projects and new initiatives dealing with the geology of the continent will be summarized and presented on a regular basis. Short notes, discussions, book reviews and conference and workshop reports will also be included when relevant.
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