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Palynology is one of the most useful tools for constructing biostratigraphic charts in the late Paleozoic basins of South America, but the lack of radiometric ages often makes it difficult to establish the precise age of the biozones. This paper focuses on two points: (i) the description of new Argentinian palynological assemblages referred to the  Lueckisporites/Weylandites  (LW) Biozone and (ii) the application of a new isotopic age that enables more confident large-scale correlations with the neighboring Paraná Basin of Brazil. The palynofloras were recovered from the upper part of the De La Cuesta Formation that crops out in the retroarc basin of the Paganzo Basin, more specifically obtained from mudstones intercalated with limestones, cherts, and tuffs interpreted as being deposited in a shallow water body. The assemblages are characterized by an abundance of bi-taeniate pollen grains of the  Lueckisporites  complex and multitaeniate pollen grains such as  Lunatisporites ,  Protohaploxypinus ,  Striatopodocarpidites ,  Tornopollenites , and  Vittatina.  Colpate pollen grains are also represented by  Marsupipollenites  and  Pakhapites . A U-Pb CA-ID-TIMS age of 278.84 ± 0.22 Ma, obtained from a tuff level interstratified with the fossiliferous strata, allows the age of the LW Biozone in the Paganzo Basin to be constrained for the first time and the adjustment of the record  Lueckisporites virkkiae  in Gondwana. Moreover, this date enables precise correlations with other basins, such as the San Rafael Basin (Yacimiento Los Reyunos Formation) in Argentina and the Brazilian Paraná Basin (Iratí Formation).

High-precision U-Pb CA-ID-TIMS calibration of the Permian Lueckisporites -dominated assemblages in westernmost Gondwana: inferences for correlations