We present the first palynological study of the La Deheza Formation in Paganzo Basin, San Juan Pr... more We present the first palynological study of the La Deheza Formation in Paganzo Basin, San Juan Province, Argentina. A total of 18 samples were studied and 116 palynomorph species were recorded. A multivariate statistical (R) analysis confirmed the occurrence of three associations. Assemblages 1 (240 m), 2 (230 m) and 3 (220 m) were referred to biozones already registered in the Paganzo Basin, i.e. Raistrickia densaConvolutispora muriornata (DM), Pakhapites fususVittatina subsaccata (FS) and Lueckisporites-Weylandites (LW) biozones. These assemblages can be assigned a PennsylvanianCisularian age based on previous stratigraphic records of the identified species.
The palynological contents of the Permian Tres Islas and Melo formations (Frayle Muerto, Mangrull... more The palynological contents of the Permian Tres Islas and Melo formations (Frayle Muerto, Mangrullo and Paso Aguiar members), obtained from boreholes and outcrop in northeastern Uruguay, are reported. These Permian sediments of the Paraná Basin yielded a total of 147 species, including the following new taxa: Archangelskiapollenites globocorpus gen. et sp. nov., A. plicatus gen. et sp. nov., Satsangisaccites uruguaiensis sp. nov. and Platysaccus orientalis sp. nov. The palynomorphs found allow identification, in borehole 221, of two palynological assemblages: 221-I (140-225 m) and 221-II (93-140 m); the former is characterised by the presence of Murospora torifera Ybert, Vallatisporites arcuatus Archangelsky & Gamerro and Lundbladispora areolata Césari et al., whereas assemblage 221-II contains Corisaccites alutas Venkatachala & Kar, Lueckisporites stenotaeniatus Menéndez, L. virkkiae Potonié & Klaus, L. angoulaensis Jardiné, Lunatisporites variesectus Archangelsky & Gamerro, Striatoabieites anaverrucosus Archangelsky & Gamerro and Staurosaccites cordubensis Archangelsky & Gamerro, among others. In borehole 201, two assemblages were also identified: 201-I (34 and 93 m) and 201-II (5 and 34 m). The former is typified by the presence of Cristatisporites chacoparanensis Ottone, C. lestai Archangelsky & Gamerro, Leiotriletes corius Kar & Bose, Murospora torifera, M. bicingulata Ybert, Vallatisporites arcuatus, V. russoi Archangelsky & Gamerro, Illinites unicus Kosanke, Limitisporites hexagonalis Maheswari and Protohaploxypinus bhardwajii Foster among others. Assemblage 201-II is characterized by the presence of Brevitriletes levis (Balme & Hennelly) Bharadwaj & Srivastava, Pakhapites fusus (Bose & Kar) Menéndez, P. ovatus (Bose & Kar) García, Platysaccus papilionis Potonié & Klaus, Protohaploxypinus limpidus (Balme & Hennelly) Balme & Playford, Striatopodocarpites cancellatus (Balme & Hennelly) Hart and Polarisaccites bilateralis Ybert & Marques-Toigo. Based on the previous records of those taxa, assemblages 221-I, 201-I and 201-II are assigned to the Early Permian (Asselian-Artinskian) and assemblage 221-II to the upper part of the Early Permian (Artinskian-Kungurian). According to the stratigraphical schemes of Argentina and Brazil, they are correlated with the Biozones Cristatisporites (assemblages 221-I, 201-I and 201-II) and Striatites (assemblage 221-II and El Barón) (Chacoparaná Basin), Fusacolpites fusus-Vittatina subsaccata (assemblages 221-I, 201-I and 201-II) and Lueckisporites-Weylandites (assemblage 221-II and El Barón) (Paganzo Basin), and Vittatina costabilis (assemblages 221-I, 201-I and 201-II) and Lueckisporites virkkiae (assemblage 221-II and El Barón) (Paraná Basin).
A biozonation for the Permian strata of Uruguay is proposed based on published data from borehole... more A biozonation for the Permian strata of Uruguay is proposed based on published data from boreholes 201, 221, CLSC 3, 4, 11, 13 and 24 drilled by Dirección Nacional de Minería y Geología of Uruguay (DINAMIGE), as well as two superficial samples and the samples from borehole 254, which are described here. Eighteen samples were retrieved from borehole 254 (DINAMIGE), extending from the San Gregorio to the Yaguarí Formation. One hundred and eighty-four taxa were identified. From their vertical distribution in the column, two assemblages were recognised: a lower assemblage that encompasses the San Gregorio Formation up to the lower part of the Melo Formation (Assemblage I), and an upper assemblage that includes the upper part of the Melo Formation (Assemblage II). The boundary between these two assemblages lies in the Mangrullo Member of the Melo Formation. In ascending stratigraphic order, the zones proposed are the Cristatisporites inconstans-Vittatina saccata Assemblage Zone (IS) and the Striatoabieites anaverrucosus-Staurosaccites cordubensis Assemblage Zone (AC). In the IS Zone identified in the San Gregorio and Tres Islas Formations and in the basal part of the Melo Formation (Fraile Muerto Member), the assemblages are characterised by trilete spores and monosaccate pollen and, to a lesser extent, by non-taeniate bisaccate, taeniate bisaccate and plicate pollen grains. An early Cisuralian age is proposed for this Zone. The AC Zone was identified in the Melo Formation, in the Mangrullo and Paso Aguiar Members. It is characterised by assemblages that are dominated by bisaccate (both taeniate and non-taeniate) pollen grains. These palynological assemblages also include a few plicate and monosaccate pollen grains and trilete and monolete spores. A late Cisuralian–Guadalupian age is proposed for this zone.► A biozonation is proposed for Permian strata of Uruguay. ► The lower Zone is the Cristatisporites inconstans-Vittatina saccata Assemblage Zone (IS). ► This assemblage is characterised by trilete spores and monosaccate pollen. ► The upper Zone is the Striatoabieites anaverrucosus-Staurosaccites cordubensis Assemblage Zone (AC). ► It is characterised by assemblages that are dominated by bisaccate (both taeniate and non-taeniate) pollen grains.
We present the first palynological study of the La Deheza Formation in Paganzo Basin, San Juan Pr... more We present the first palynological study of the La Deheza Formation in Paganzo Basin, San Juan Province, Argentina. A total of 18 samples were studied and 116 palynomorph species were recorded. A multivariate statistical (R) analysis confirmed the occurrence of three associations. Assemblages 1 (240 m), 2 (230 m) and 3 (220 m) were referred to biozones already registered in the Paganzo Basin, i.e. Raistrickia densaConvolutispora muriornata (DM), Pakhapites fususVittatina subsaccata (FS) and Lueckisporites-Weylandites (LW) biozones. These assemblages can be assigned a PennsylvanianCisularian age based on previous stratigraphic records of the identified species.
The palynological contents of the Permian Tres Islas and Melo formations (Frayle Muerto, Mangrull... more The palynological contents of the Permian Tres Islas and Melo formations (Frayle Muerto, Mangrullo and Paso Aguiar members), obtained from boreholes and outcrop in northeastern Uruguay, are reported. These Permian sediments of the Paraná Basin yielded a total of 147 species, including the following new taxa: Archangelskiapollenites globocorpus gen. et sp. nov., A. plicatus gen. et sp. nov., Satsangisaccites uruguaiensis sp. nov. and Platysaccus orientalis sp. nov. The palynomorphs found allow identification, in borehole 221, of two palynological assemblages: 221-I (140-225 m) and 221-II (93-140 m); the former is characterised by the presence of Murospora torifera Ybert, Vallatisporites arcuatus Archangelsky & Gamerro and Lundbladispora areolata Césari et al., whereas assemblage 221-II contains Corisaccites alutas Venkatachala & Kar, Lueckisporites stenotaeniatus Menéndez, L. virkkiae Potonié & Klaus, L. angoulaensis Jardiné, Lunatisporites variesectus Archangelsky & Gamerro, Striatoabieites anaverrucosus Archangelsky & Gamerro and Staurosaccites cordubensis Archangelsky & Gamerro, among others. In borehole 201, two assemblages were also identified: 201-I (34 and 93 m) and 201-II (5 and 34 m). The former is typified by the presence of Cristatisporites chacoparanensis Ottone, C. lestai Archangelsky & Gamerro, Leiotriletes corius Kar & Bose, Murospora torifera, M. bicingulata Ybert, Vallatisporites arcuatus, V. russoi Archangelsky & Gamerro, Illinites unicus Kosanke, Limitisporites hexagonalis Maheswari and Protohaploxypinus bhardwajii Foster among others. Assemblage 201-II is characterized by the presence of Brevitriletes levis (Balme & Hennelly) Bharadwaj & Srivastava, Pakhapites fusus (Bose & Kar) Menéndez, P. ovatus (Bose & Kar) García, Platysaccus papilionis Potonié & Klaus, Protohaploxypinus limpidus (Balme & Hennelly) Balme & Playford, Striatopodocarpites cancellatus (Balme & Hennelly) Hart and Polarisaccites bilateralis Ybert & Marques-Toigo. Based on the previous records of those taxa, assemblages 221-I, 201-I and 201-II are assigned to the Early Permian (Asselian-Artinskian) and assemblage 221-II to the upper part of the Early Permian (Artinskian-Kungurian). According to the stratigraphical schemes of Argentina and Brazil, they are correlated with the Biozones Cristatisporites (assemblages 221-I, 201-I and 201-II) and Striatites (assemblage 221-II and El Barón) (Chacoparaná Basin), Fusacolpites fusus-Vittatina subsaccata (assemblages 221-I, 201-I and 201-II) and Lueckisporites-Weylandites (assemblage 221-II and El Barón) (Paganzo Basin), and Vittatina costabilis (assemblages 221-I, 201-I and 201-II) and Lueckisporites virkkiae (assemblage 221-II and El Barón) (Paraná Basin).
A biozonation for the Permian strata of Uruguay is proposed based on published data from borehole... more A biozonation for the Permian strata of Uruguay is proposed based on published data from boreholes 201, 221, CLSC 3, 4, 11, 13 and 24 drilled by Dirección Nacional de Minería y Geología of Uruguay (DINAMIGE), as well as two superficial samples and the samples from borehole 254, which are described here. Eighteen samples were retrieved from borehole 254 (DINAMIGE), extending from the San Gregorio to the Yaguarí Formation. One hundred and eighty-four taxa were identified. From their vertical distribution in the column, two assemblages were recognised: a lower assemblage that encompasses the San Gregorio Formation up to the lower part of the Melo Formation (Assemblage I), and an upper assemblage that includes the upper part of the Melo Formation (Assemblage II). The boundary between these two assemblages lies in the Mangrullo Member of the Melo Formation. In ascending stratigraphic order, the zones proposed are the Cristatisporites inconstans-Vittatina saccata Assemblage Zone (IS) and the Striatoabieites anaverrucosus-Staurosaccites cordubensis Assemblage Zone (AC). In the IS Zone identified in the San Gregorio and Tres Islas Formations and in the basal part of the Melo Formation (Fraile Muerto Member), the assemblages are characterised by trilete spores and monosaccate pollen and, to a lesser extent, by non-taeniate bisaccate, taeniate bisaccate and plicate pollen grains. An early Cisuralian age is proposed for this Zone. The AC Zone was identified in the Melo Formation, in the Mangrullo and Paso Aguiar Members. It is characterised by assemblages that are dominated by bisaccate (both taeniate and non-taeniate) pollen grains. These palynological assemblages also include a few plicate and monosaccate pollen grains and trilete and monolete spores. A late Cisuralian–Guadalupian age is proposed for this zone.► A biozonation is proposed for Permian strata of Uruguay. ► The lower Zone is the Cristatisporites inconstans-Vittatina saccata Assemblage Zone (IS). ► This assemblage is characterised by trilete spores and monosaccate pollen. ► The upper Zone is the Striatoabieites anaverrucosus-Staurosaccites cordubensis Assemblage Zone (AC). ► It is characterised by assemblages that are dominated by bisaccate (both taeniate and non-taeniate) pollen grains.
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