America's National Oceanic and Atmospheric Administration,NOAA, says the coral reefs that exist today are up to fifty million years old.

VOA: special.2010.08.10

Then,within the last twenty million years, movements in the earth pushed the rock upward, forming the Guadalupe Mountains.

VOA: special.2009.12.07

The Appalachian Mountains in the eastern United States, for example, are about two hundred million years old.

VOA: special.2009.02.16

The rock formations there are the result of deposits made by ancient lakes and rivers over a period of about twenty million years.

VOA: special.2009.04.15

The researchers used the fossils of a dinosaur that lived one hundred twenty-five million years ago.

VOA: special.2010.03.16

Mister Hellsten says to look at parts of the genome of Xenopus tropicalis is to look at structures three hundred sixty million years old.

VOA: special.2010.06.29

This was formed by two explosions of the Jemez volcano more than one million years ago.

VOA: special.2010.07.05

Many scientists believe that a huge object from space hit Earth about 65 million years ago.

VOA: special.2009.01.20

The study showed that pandas have been in existence for up to three million years.

VOA: special.2010.01.19

The small dinosaur is thought to have lived about one hundred twenty-five million years ago.

VOA: special.2009.10.13

The ancestors of these reefs were formed at least two hundred forty million years ago.

VOA: special.2010.08.10

He said the huge continent had split more than two hundred million years ago.

VOA: special.2010.01.12

These creatures lived more than sixty-five million years ago, during Earth's late Cretaceous period.

VOA: special.2010.10.05

Scientists say that most arches seen today developed within the past million years.

VOA: special.2009.04.15

It happened almost sixty million years ago and again thirteen million years ago.

VOA: special.2010.02.02

To understand that, you would have to travel back in time two-hundred-fifty-million years.

VOA: special.2010.01.04

These sandstone structures continued to grow for about one hundred fifty million years.

VOA: special.2009.04.15

Scientists say the area began forming almost two thousand million years ago.

VOA: special.2009.04.15

They developed more than a hundred million years before the dinosaurs.

VOA: special.2009.04.03

A large meteorite hit the area four thousand million years ago.

VOA: special.2009.07.29

The Grand Teton Mountains were formed about ten million years ago.

VOA: special.2009.02.16