THE FIRST PALYNOLOGICAL RECORD OF THE SAUCE GRANDE FORMATION (PENNSYLVANIAN-CISURALIAN)AT THE AUSTRALES RANGE, BUENOS AIRES PROVINCE, ARGENTINE

Mercedes Di Pasquo, Marcelo Martínez, Hugo Freije

Abstract


The first palynological assemblage recovered
from a sample of the Middle Member of the Sauce Grande Formation is presented. Palynomorphs are
small (among 20 μm - 50 μm) and poorly preserved. Exines are fragmented, highly carbonized (dark gray
or black in colour) and affected by framboidal pyrite. Eleven species of palynomorphs are described and
illustrated: nine trilete spores (Apiculiretusispora sp., Cyclogranisporites sp., Granulatisporites austroamericanus
Archangelsky and Gamerro, Lophotriletes sp., Horriditriletes sp. cf. H. gondwanensis (Tiwari and Moiz)
Foster, Horriditriletes sp. cf. H. ramosus (Balme and Hennelly) Bharadwaj and Salujha, Raistrickia sp.,
Lundbladispora sp., Cristatisporites sp.), one pollen grain and one acritarch. The assemblage is referred to
the Late Pennsylvanian -Cisuralian based on the stratigraphic range of the species recognized that additionally
are widely distributed in Gondwana (e.g., Chacoparaná, Paraná, Paganzo, Karroo). The dominance
of spores, and the presence of framboidal pyrite and an acritarch suggest a marine littoral palaeoenvironment
for the assemblage.

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