Early angiosperm diversification in the Cretaceous of Argentina: First aproach

ARCHANGELSKY SERGIO; VIVIANA BARREDA; MAURO G. PASSALIA; PRÁMPARO MERCEDES B.; ROMERO EDGARDO; ZAMUNER ALBA B.; CÚNEO RUBEN; GANDOLFO M. ALEJANDRA; IGLESIAS ARI; MAGDALENA LLORENS; GABRIELA G. PUEBLA; QUATTROCCHIO M.E.; WOLFGANG VOLKHEIMER

Bariloche

Congreso; International Organization of Paleobotany Conference; 2004

Museo Egidio feruglio

In this report, we analyze the angiosperm fossil record (micro- and megafossil) from the central and southern basins of Argentina, southern South America, deposited between the Aptian (125 my) and the end of the Coniacian (85.8 my). Based on this analysis, four major phases in the evolution of the angiosperms in the southernmost region of South America are established as follows: the Late Aptian, the latest Aptian-earliest Albian, the Late Albian- Cenomanian, and the Turonian-Coniacian. The comparision between our fossil data set and those from the North America Potomac Group sequence suggest that the evolution and diversification of the angiosperms in both hemispheres occurred roughly synchronously.