Salvinialean megaspores in the Late Cretaceous of southern Patagonia, Argentina

SANTAMARINA, PATRICIO; BARREDA, VIVIANA; IGLESIAS, ARI; VARELA, AUGUSTO

ACTA PALAEONTOLOGICA POLONICA

INST PALEOBIOLOGII PAN

Año: 2018 vol. 63 p. 607 - 616

0567-7920

We report here two megaspores species related to the aquatic ferns of the Order Salviniales from the Late Cretaceous Mata Amarilla Formation (Austral Basin), southern Santa Cruz Province, Argentina. We identified the species Arcellites disciformis and Balmeisporites cf. B. holodictyus. The presence of A. disciformis, in particular, is significant not onlybecause it represents the first record for the Southern Hemisphere, indicating a bi-hemispheric distribution for the species, but also because it increases the diversity of this genus in Patagonia. The new findings of salvinialean megaspores highlight the importance of water ferns in the Late Cretaceous aquiferous enviroments of southern South America. The  common occurrences of Arcellites and Balmeisporites, whether in shallow, fresh or brackish water facies, indicates aquatic paleoenvironment of the Mata Amarilla Formation, as was inferred also from the sedimentological evidence. Their presence also indicates that the lower and middle levels of the Mata AmarillaFormation can be attributed to the megaspore Zone M3 (Albian?Cenomanian) defined for the Cretaceous of Patagonia.