A Tropical Rainforest in Colorado 1.4 Million Years After the Cretaceous-Tertiary Boundary

@article{Johnson2002ATR,
  title={A Tropical Rainforest in Colorado 1.4 Million Years After the Cretaceous-Tertiary Boundary},
  author={Kirk R. Johnson and Bethany Ellis},
  journal={Science},
  year={2002},
  volume={296},
  pages={2379 - 2383}
}
An extremely diverse lower Paleocene (64.1 million years ago) fossil leaf site from Castle Rock, Colorado, contains fossil litter that is similar to the litter of extant equatorial rainforests. The presence of a high-diversity tropical rainforest is unexpected, because other Paleocene floras are species-poor, a feature generally attributed to the Cretaceous-Tertiary (K-T) extinction. The site occurs on the margin of the Denver Basin in synorogenic sedimentary rocks associated with the rise of… 

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