Within The Black

When dinosaurs roamed the Earth 90 million years ago, the planet was much warmer, including Antarctica at the South Pole. But in a surprising twist, researchers have discovered evidence that Antarctica also supported a swampy rainforest at the time, according to a new study.
Researchers captured a slice of the seafloor using a drill rig aboard a polar research vessel on West Antarctica's Amundsen Sea between February and March in 2017. The sediment core sample was taken near the Pine Island and Thwaites glaciers.
CT scans of the sediment core revealed pristine samples of forest soil, pollen, spores and even root systems so well preserved that they could identify cell structures. The soil included examples of pollen from the first flowering plants found this close to the South Pole.
https://edition.cnn.com/2020/04/01/worl ... index.html

I have read about this on mainstream media as well. I wonder what was the temperature of the earth when there was no ice but rainforest in Antarctica? In the age of dinosaurs, the earth had more oxygen in the atmosphere. That might be due to more forested areas on earth.