Pleistocene

The Pleistocene was an epoch of Earth history, (PROSE: Prehistory Repeating Itself ^[+]Loading...["Prehistory Repeating Itself (feature)"]) alternately referred to as an era (TV: Time-Flight) or period. (TV: The Seeds of Doom)

History

A day to come

When sent back 140,000,000 years to the Jurassic, the Fifth Doctor believed the chill in the air indicated the Pleistocene was not far off. (TV: Time-Flight)

The Pleistocene

A landscape of ice and snow, the Pleistocene was an ice age. Glaciers covered much of the planet; so much water was locked up in these glaciers that the sea level was hundreds of metres lower. Beyond the glaciated regions were hundreds of kilometres of icy permafrost. The temperature over much of the planet was well below freezing. Cold winds whipped off the glaciers and howled across the tundra. To survive in the Pleistocene, creatures had to be able to keep warm. Many of the big creatures of this epoch were furred or hairy to retain body heat. It was during this time that the sabre-toothed tiger, the woolly mammoth, and the giant sloth thrived. (PROSE: Prehistory Repeating Itself ^[+]Loading...["Prehistory Repeating Itself (feature)"])

Bernice Summerfield knew of a theory that humans were reduced to less than ten thousand individuals during the Pleistocene; she believed a single drought could have wiped them out. (PROSE: Genius Loci)

A Krynoid pod found in Antarctica dated to 18,000 BC was from the late Pleistocene. (TV: The Seeds of Doom)

Behind the scenes

Contrary to the Fifth Doctor in Time-Flight, the Pleistocene epoch was over 143,000,000 years after the Jurassic period. Furthermore, 140,000,000 years ago was in the early Cretaceous, not the Jurassic.

While not mentioned in the text, COMIC: Medicine Man is dated to the Pleistocene on the Titan Comics website.