Sentences with phrase «height of the last ice age»

«Air temperature influenced African glacial movements at height of last ice age.»

Even when sea levels were at their lowest, about 22,000 years ago at the height of the last ice age, the islands were likely out of the deer's swimming range.

In fact, we only know of one recent extinction with no human involvement — a species of spruce, Picea critchfieldii, which was common in the lower Mississippi valley at the height of the last ice age but died out 12,000 years ago (Proceedings of the National Academy of Sciences, vol 96, p 13847).

Changes in air temperature, not precipitation, drove the expansion and contraction of glaciers in Africa's Rwenzori Mountains at the height of the last ice age, according to a Dartmouth - led study.

The thrust of the genetic and archaeological evidence is that the ancestors of Native Americans walked or paddled from Siberia between 13,000 and 17,000 years ago, at the height of the last ice age.

More recent evidence, however, indicated that the Cordilleran and Laurentide ice sheets coalesced at the height of the last ice age, around 21,000 years ago, closing the corridor much earlier than any evidence of humans south of the ice sheets.

The location, date, and composition of the artifacts suggest not only that our ancestors had adapted to the climate, says Michael Waters, an archaeologist at Texas A&M University, but that they may also have been in a position to migrate across the Bering Land Bridge to North America before glaciers closed off the route at the height of the last ice age.

It was the height of the last ice age, and survival required desperate measures — especially from those in Eurasia, where food and wood fuel ran low.

A controversial find of stone tools in Brazil suggests that humans somehow reached the Americas at the height of the last ice age

Bar - Yosef points out that, at the time, Earth was in the clutches of the Last Glacial Maximum, the height of the last ice age.

The original Americans came from Siberia in a single wave no more than 23,000 years ago, at the height of the last Ice Age, and apparently hung out in the north — perhaps for thousands of years — before spreading in two distinct populations throughout North and South America, according to a new genomic analysis.

«There must have been significant melt - back of sea ice each summer even at the height of the last ice age to have sea ice formation on the shelves each year.

Dormant for thousands of years, it once featured a large glacier on its massive peak at the height of the last ice age about 21,000 years ago.

They maintain that the first Americans were the Clovis people, who crossed into the New World from Asia when a fall in sea levels at the height of the last Ice Age created a land bridge, known as Beringia, between the two continents.

At the height of the last Ice Age huge ice sheets covered the northern continents.

(At the height of the last Ice Age, when New York was several metres under ice, Earth's mean temperature was only 5 degrees cooler than it is now.)

At the height of the last ice age, when much of North America was covered in ice, sea level was about 400 feet lower.

In a time period 21,000 years ago called the Last Glacial Maximum, at the height of the last Ice Age, the Southwest was wetter than is seen now — a lot wetter — while the Northwest was much drier, the researchers report.