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Press Release 11-179
Tibetan Plateau: New Cradle of the Ice Age Giants

Extinct woolly rhino, three-toed horse, Tibetan bharal, chiru among recent fossil finds

Artist's reconstruction of Tibetan woolly rhino.

Artist's reconstruction of Tibetan woolly rhino that "snow swept" for vegetation.
Credit and Larger Version

September 1, 2011

The discovery of a primitive woolly rhino fossil in Tibet suggests that some giant mammals first evolved there before the beginning of the Ice Age.

The finding is published in this week's issue of the journal Science, and is funded by the National Science Foundation (NSF).

The extinction of Ice Age giants such as woolly mammoths, woolly rhinos, giant sloths and saber-toothed cats has been widely studied, but much less is known about where these giants came from, and how they acquired their adaptations for life in a cold environment.

A team of geologists and paleontologists led by Xiaoming Wang from the Natural History Museum of Los Angeles County (NHM) and Qiang Li of Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, uncovered a complete skull and lower jaw of a new species of woolly rhino (Coelodonta thibetana).

The find happened in the foothills of the Himalayas in the southwestern Tibetan Plateau.

"Cold places, such as Tibet and the Arctic and Antarctic, are where the most unexpected discoveries will be made in the future--these are the remaining frontiers that are still largely unexplored," said Wang.

The new rhino is 3.6 million years old (middle Pliocene), much older and more primitive than its Ice Age (Pleistocene) descendants in the mammoth steppes across much of Europe and Asia.

The extinct animal had special adaptations for sweeping snow, using its flattened horn to reveal vegetation, a useful behavior for survival in the harsh Tibetan climate.

The rhinos lived at a time when global climate was much warmer and the northern continents were free of the massive ice sheets seen in the later Ice Age.

The rhino grew accustomed to cold conditions in high elevations, and became "pre-adapted" for the future Ice Age climate.

When the Ice Age eventually arrived, the cold-loving rhinos simply descended from the high mountains and began to expand throughout northern Asia and Europe.

"This discovery clarifies the origin of the woolly rhinoceros and perhaps much of the now extinct, cold-adapted, large animals that lived in the region of the Himalayas and throughout Eurasia some 2.6 million years ago," said geologist and paleontologist H. Richard Lane of NSF's Division of Earth Sciences.

In addition to the new woolly rhino, the paleontologists uncovered extinct species of three-toed horse (Hipparion), Tibetan bharal (Pseudois, also known as blue sheep), chiru (Pantholops, also known as Tibetan antelope), snow leopard (Uncia), badger (Meles), as well as 23 other kinds of mammals.

The fossil assemblage from Tibet offers new insights into the origin of the cold-adapted Pleistocene megafauna, which has usually been sought in arctic tundra or in cold steppes elsewhere.

The new evidence sets up an alternative scenario: the harsh winters of the rising Tibetan Plateau may have provided the initial step toward cold-adaptation for several successful members of the late Pleistocene mammoth fauna in Europe, Asia, and to a lesser extent, North America.

The Tibetan Plateau may have been another cradle of the Ice Age giants.

Support for the research was also provided by Chinese National Natural Science Foundation, Chinese Academy of Sciences and National Geographic Society.

-NSF-

Media Contacts
Cheryl Dybas, NSF, (703) 292-7734, cdybas@nsf.gov
Kristin Friedrich, NHM, (213) 763-3532, kfriedri@nhm.org

The National Science Foundation (NSF) is an independent federal agency that supports fundamental research and education across all fields of science and engineering. In fiscal year (FY) 2014, its budget is $7.2 billion. NSF funds reach all 50 states through grants to nearly 2,000 colleges, universities and other institutions. Each year, NSF receives about 50,000 competitive requests for funding, and makes about 11,500 new funding awards. NSF also awards about $593 million in professional and service contracts yearly.

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Map of Eurasia showing descent of woolly rhinos in latitude with expansion of cold habitats.
As global climate cooled and cold habitats expanded, woolly rhinos descended in latitude.
Credit and Larger Version

Photo of rock exposures in the Himalayas' Zanda Basin.
Rock exposures in the Himalayas' Zanda Basin are a paleontologic nirvana for fossil-hunters.
Credit and Larger Version

Artist's illustration of the head of the Tibetan woolly rhino, Coelodonta thibetana.
Artist's illustration of the head of Coelodonta thibetana, the Tibetan woolly rhino.
Credit and Larger Version

Photo of the skull and lower jaw of the extinct Tibetan woolly rhino.
Skull and lower jaw of the extinct Tibetan woolly rhino.
Credit and Larger Version

Phylogenetic relationship of woolly rhinos and their close relatives over geologic time.
Phylogenetic relationship of woolly rhinos and their close relatives over geologic time.
Credit and Larger Version

Cover of the September 2, 2011 issue of the journal Science.
The researchers' work is described in the September 2, 2011 issue of the journal Science.
Credit and Larger Version



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