High Plant Diversity in Eocene South America: Evidence from Patagonia

@article{Wilf2003HighPD,
  title={High Plant Diversity in Eocene South America: Evidence from Patagonia},
  author={Peter Wilf and N{\'e}stor R C{\'u}neo and Kirk R. Johnson and Jason F. Hicks and Scott L. Wing and John D. Obradovich},
  journal={Science},
  year={2003},
  volume={300},
  pages={122 - 125}
}
Tropical South America has the highest plant diversity of any region today, but this richness is usually characterized as a geologically recent development (Neogene or Pleistocene). From caldera-lake beds exposed at Laguna del Hunco in Patagonia, Argentina, paleolatitude ∼47°S, we report 102 leaf species. Radioisotopic and paleomagnetic analyses indicate that the flora was deposited 52 million years ago, the time of the early Eocene climatic optimum, when tropical plant taxa and warm, equable… 
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