Palynology of Late Palaeozoic sediments (Tupe Formation) at La Herradura Creek, San Juan province, Argentina

VERGEL, M.M.

ALCHERINGA

Association of Australasian Palaeontologists (AAP)

Lugar: Sydney, Australia; Año: 2008 p. 339 - 352

0311-5518

Palynomorph assemblages recovered from the Tupe Formation at La Herradura  Creek, San Juan province, Argentina are analyzed. The middle section of the  sequence includes a marine fossiliferous interval belonging to the Tivertonia  jachalensis-Streptorhynchus inaequiornatus (T-S) Faunal Biozone, recently  ascribed an Early Permian age. The section below the marine fossiliferous unit  yielded palynofloras typical of previously described Tupense assemblages. The  palynoflora recovered from beds above the marine horizonts diverse, relatively well  preserved, and includes species never recorded from the Tupe Formation. This later  palynoassemblage includes species diagnostic of Early Permian palynofloras  such as Converrucosisporites confluens (Archangelsky & Gamerro) Playford &  Dino, Pseudoreticulatispora pseudoreticulata (Balme & Hennelly) Bharadwaj &  Srivastava, Horriditriletes ramosus (Balme & Hennelly) Bharadwaj & Salujha,  Anapiculatisporites tereteangulatus (Balme & Hennelly) Playford & Dino,  Laevigatosporites colliensis (Balme & Hennelly) Venkatachala & Kar,  Marsupipollenites triradiatus Balme & Hennelly, Protohaploxypinus sewardii  (Virkki) Hart and Pakhapites fusus (Bose & Kar) Menéndez. Correlations with  assemblages from western Argentina and other Gondwanan regions, suggest an  Early Permian age (not older than Asselian-Sakmarian) for the upper part of the  sequence, supporting the age attributed to the T-S Biozone.