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Salvinialean megaspores in the Late Cretaceous of southern Patagonia, Argentina

100%

Santamarina P. E., Barreda V. D., Iglesias A., Varela A. N.

Acta Palaeontologica Polonica

2018

tom 63

nr 3

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 only because 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 Amarilla Formation can be attributed to the megaspore Zone M3 (Albian–Cenomanian) defined for the Cretaceous of Patagonia.

Pollen morphology of Nothofagus (Nothofagaceae, Fagales) and its phylogenetic significance

88%

Fernandez D. A., Santamarina P. E., Telleria M. C., Palazzesi L., Barreda V. D.

Acta Palaeobotanica

2016

tom 56

nr 2

Ograniczanie wyników

1 Acta Palaeobotanica

1 Acta Palaeontologica Polonica

2 Barreda V. D.

2 Santamarina P. E.

1 Fernandez D. A.

1 Iglesias A.

1 Palazzesi L.

1 Telleria M. C.

1 Varela A. N.

1 2018

1 2016

Wyniki wyszukiwania

Salvinialean megaspores in the Late Cretaceous of southern Patagonia, Argentina

Pollen morphology of Nothofagus (Nothofagaceae, Fagales) and its phylogenetic significance