Sentences with phrase «ancient continent»

Magnetic traces have long been used to calculate the latitudes, the north - south positions, of ancient continents.

These gems, brought to the surface by volcanic eruptions, were uncovered in five ancient continents by researchers over the course of more than 30 years.

Researchers analyzed the levels of various trace elements in hundreds of samples of carbon - rich shales that had been deposited in oxygen - poor regions of the ocean surrounding ancient continents during the past 3.5 billion years.

Magma flows tend to concentrate valuable metals such as platinum, so mapping ancient continents may help miners find lucrative new deposits, Ernst says.

As story adds to story, the recent past connects with forgotten ages long ago, then much longer ago, as he describes the movement of plates and the development of ancient continents and seas.

For many years, it was thought that dinosaurs originated in the southern hemisphere on the ancient continent known as Gondwana.

That suggests that people separated into distinct groups while still living on the ancient continent of Sahul, which included modern Australia, New Guinea, and Tasmania.

An atlas of the ancient continents swallowed up long ago is the first to show the whereabouts of almost 100 tectonic plates that have sunk

Some 165 million years previous, Madagascar had split off from Gondwanaland, preserving many of that ancient continent's species and giving rise to some astonishing new ones.

Patterns in the Aboriginal DNA also point to a genetic bottleneck about 50,000 years ago: the lasting legacy of the small group that first colonized the ancient continent.

The Indian Ocean and some of its islands, scientists say, may lie on top of the remains of an ancient continent pulled apart by plate tectonics between 50 million and 100 million years ago.

«Until now, none of the estimates of global hydrogen production sustaining deep microbial populations had included a contribution from the ancient continents.

They date to about 540 million years ago, a time when Death Valley lay on the edge of an ancient continent, lined with sandy beaches.

Current reconstructions of the globe's geography during the early Cambrian show the ancient continent of Laurentia — the ancestral core of North America — as already having separated from the supercontinent Gondwanaland.

The new data are consistent with suspicions that the highland plateaus of Venus are ancient continents, once surrounded by ocean and produced by past volcanic activity.

Sea stacks, including Haystack Rock, are the result of ancient continent - building lava flows to the sea.

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The resulting series of photographs captures the dramatic natural landscape of this remote and ancient continent.

Buchanan Lake, located in the Canadian High Arctic, once formed part of the ancient continent of Pangea downwind from the volcanic region known today as the Siberian Traps.