Fossil woods from the Oligocene of southwestern Patagonia (Río Leona Formation). Rosaceae and Nothofagaceae

Roberto Román Pujana


Systematic studies of angiosperm fossil woods from sediments of the Río Leona Formation were
continued. A new morphospecies of Maloidoxylon with affinity to Rosaceae was described and constitutes,
together with the fossil pollen from the same strata, the oldest South American fossil with this familial
affinity. Nothofagaceae fossil woods are represented by the morphospecies Nothofagoxylon scalariforme
Gothan, Nothofagoxylon kraeuseli Boureau et Salard, Nothofagoxylon triseriatum Torres et Lemoigne,
Nothofagoxylon ruei Salard and a new morphospecies of Nothofagoxylon. Three of the four subgenera of
Nothofagus were recognized in the fossil woods and a new infrageneric affinity for Nothofagoxylon ruei was
proposed. The described woods have affinity to extant genera and species that inhabit Patagonia, except
for the Rosaceae wood where the generic affinity is not well-established.

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