A guide to Phanerozoic cold polar climates from high-latitude ice-rafting in the Cretaceous

@article{Frakes1988AGT,
  title={A guide to Phanerozoic cold polar climates from high-latitude ice-rafting in the Cretaceous},
  author={Lawrence A. Frakes and Jane E. Francis},
  journal={Nature},
  year={1988},
  volume={333},
  pages={547-549}
}
The high-latitude extent of warm-climate indicators at certain times in Earth history has been considered as evidence that the globe was ice-free for long intervals, despite theoretical considerations and results from numerical modelling experiments1,2 indicating that this was unlikely. One of the warmest periods, the Cretaceous, displays faunal and floral evidence for 'cool-temperate' to 'sub-tropical' conditions very near to the poles. However, our studies of Lower Cretaceous mudstones of… 
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