Gregory Hoke, assistant professor of Earth sciences, said they've determined the elevation history of the southeast margin of the Tibetan Plateau, asserting by the Eocene epoch
(approximately 40 million years ago), the southern part of the plateau extended some 600 miles more to the east than previously documented.
Pelican spiders are an ancient lineage (Archaea paradoxa shown, from Eocene epoch
It had been deposited there during the Eocene epoch
, during which time much of the world was covered in tropical rainforests - palm trees grew as far north as Alaska during this era.
The fossil was recovered from sedimentary rock strata that were deposited in the ancient lake roughly 55 million years ago, during the early part of the Eocene epoch
It lived alongside other herbivorous and carnivorous mammals during the Eocene epoch
Global warming kicked off the Eocene epoch
about 55 million years ago, but new research shows that this greenhouse phase did little for North America's plants.
The early Eocene Epoch
(50 million years ago) was about as warm as the Earth has been over the past 65 million years, since the extinction of the dinosaurs," Linda Ivany, associate professor of earth sciences said.
The younger group hails from the Eocene epoch
, 53 million years ago, during which temperatures reached a peak.
Consisting of rock layers formed between the Jurassic Period (200-145 million years ago) and the more recent Eocene Epoch
(55-34 million years ago), the Hazarchishma Natural Bridge was carved over millennia by the once flowing waters of the now dry Jawzari Canyon.
The planet was warmer, however, during the Eocene epoch
, which may explain how smaller animals could have flourished then, says Bloch.