Shadow
08-12-2012, 10:41 AM
Researchers in Canada's western Arctic have found evidence of a crater that formed when a huge meteorite slammed into Earth millions of years ago. Measuring about 15 miles (25 kilometers) across, the formation was named the Prince Albert impact crater after the peninsula where it was discovered. Researchers don't know exactly when it was created, but evidence suggests the crater is between 130 million and 350 million years old, according to a statement from the University of Saskatchewan.
Meteors are fragments of asteroids or comets that enter Earth's atmosphere at high speeds; most are small, some as tiny as a grain of sand, so they disintegrate in the air, and only rarely are they large enough to make it to Earth's surface. When meteors slam into Earth (http://www.livescience.com/7283-catastrophic-comet-chilled-killed-ice-age-beasts.html), they are called meteorites (http://www.space.com/15353-meteor-showers-facts-shooting-stars-skywatching-sdcmp.html).
A team of geologists spotted this newly identified meteorite crater while surveying the region for possible energy and mineral resources. They were initially intrigued by steeply tilted strata visible in river gorges and other features in the flat tundra of northwestern Victoria Island. [Photos: Prince Albert Impact Crater (http://www.ouramazingplanet.com/3312-prince-albert-impact-crater-photos.html)]
"Unless you recognized the telltale clues, you wouldn't know what you were looking at," researcher Brian Pratt explained in the statement. "You might see a bunch of broken rocks and wonder how they got there, but we found abundant shatter cones."
Shatter cones are surface features with distinctive wavy patterns that are known to be created only by the tremendous force of a meteorite impact or an underground nuclear explosion. What's more, Pratt said his map showed that the feature is circular, which is characteristic of impact craters.
http://news.yahoo.com/massive-meteorite-crater-found-canadian-arctic-182213152.html
Meteors are fragments of asteroids or comets that enter Earth's atmosphere at high speeds; most are small, some as tiny as a grain of sand, so they disintegrate in the air, and only rarely are they large enough to make it to Earth's surface. When meteors slam into Earth (http://www.livescience.com/7283-catastrophic-comet-chilled-killed-ice-age-beasts.html), they are called meteorites (http://www.space.com/15353-meteor-showers-facts-shooting-stars-skywatching-sdcmp.html).
A team of geologists spotted this newly identified meteorite crater while surveying the region for possible energy and mineral resources. They were initially intrigued by steeply tilted strata visible in river gorges and other features in the flat tundra of northwestern Victoria Island. [Photos: Prince Albert Impact Crater (http://www.ouramazingplanet.com/3312-prince-albert-impact-crater-photos.html)]
"Unless you recognized the telltale clues, you wouldn't know what you were looking at," researcher Brian Pratt explained in the statement. "You might see a bunch of broken rocks and wonder how they got there, but we found abundant shatter cones."
Shatter cones are surface features with distinctive wavy patterns that are known to be created only by the tremendous force of a meteorite impact or an underground nuclear explosion. What's more, Pratt said his map showed that the feature is circular, which is characteristic of impact craters.
http://news.yahoo.com/massive-meteorite-crater-found-canadian-arctic-182213152.html