Otherlands: A Journey Through Earth's Extinct Worlds is a nonfiction book about palaeontology written by Thomas Halliday, a British palaeontologist.

Halliday uncovers for the lay public the vast changes in fauna, flora, topography, and climate over the past 555 million years.

Depending on how much CO2is emitted, the Earth could very well be heading towards Eocene-temperature levels far faster than any underlying long term paleontology-cycle would suggest.

He holds a Leverhulme Early Career Fellowship at the University of Birmingham, and is a scientific associate of the Natural History Museum.

"An extraordinary history of our almost-alien Earth"[3] "A stirring, eye-opening journey into deep time, from the Ice Age to the first appearance of microbial life 550 million years ago, by a brilliant young paleobiologist.

"[6] "In this remarkable book, the award-winning scientist Thomas Halliday takes us on a tour of the landscapes, flora and fauna of the distant past.

"[9] "As a paleontologist, Halliday is at home with an amazing range of technical terms, casually rattling off thorny ones like Anthropornis nordenskjoeldi or palaeoscolecids.

Each chapter presents its own point in time in memorable fashion, homing in on everyday experiences to make that particular “otherland” come alive.