Ice age steppe bison skull found near Tuktoyaktuk, N.W.T.

A skull believed to have belongedto an ice age steppe bison is on its way to the Yukon BeringiaInterpretive Centre inWhitehorse, after it was reportedly uncovered on the Inuvik toTuktoyaktukHighwaylast week.

The species went extinct within the last 5,000 years,but the skull can help scientists learn more about how it lived.

Skulls like this one are found relatively frequently in the Yukon, but are much less common in the Northwest Territories all because of how the ice sheets behaved thousands of years ago.

"The reason you don't find a lot of stuff is that the majority of the Northwest Territories was covered in this big ice sheet," says Elizabeth Hall, a Yukon government paleontologist.

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However, she explains, there was a narrow strip of land on the Arctic coast, where large mammals like mammoths and steppe bison would have thrived.

When they died, their remains would have been buried and quickly frozen, which has been a boon to modern scientists.

"Because these specimens arefrozen in the permafrost ... they're pretty well preserved, they're like a modern specimen in a sense," says Hall. "So you can get biological information out of them, which you wouldn't be able to get from something that's been sitting out."

A well-preserved skull can contain a wealth of information. By testing for particular isotopes of carbon and nitrogen, scientists can get information about the individual's diet. By looking atthe element strontium in their teeth, they can tell where the animal lived and roamed. Even the dense bones of the inner ear can yield DNA and its plethora of genetic information.

This latest skull, while a rare find for the Northwest Territories, is not the first. An extremely well-preserved and nearly intact steppe bisonspecimen was found nearTsiigehtchicin 2007; that 11,000 year-oldcarcass included hide and even intestines.

That preservation was alsodue to the frozen ground.

"Thank you, permafrost," laughs Hall.