Free Newsletters - Space - Defense - Environment - Energy - Solar - Nuclear
..
. Earth Science News .




SHAKE AND BLOW
New, younger age determined for the Grand Canyon
by Staff Writers
Albuquerque (UPI) Jan 27, 2013


disclaimer: image is for illustration purposes only

The Grand Canyon, long believed by many to be 70 million years old, is much younger that that -- 5 to 6 million years old -- a U.S. geologist says.

The Grand Canyon in its current entire form came about when two ancient paleocanyons -- one formed between 50 and 70 million years ago and the other formed 15 to 25 million years ago -- become one giant throughgoing canyon when all of a number of canyon segments, including those only formed in the last 5 to 6 million years, became linked due to erosion from the Colorado River, Karl Karlstrom of the University of New Mexico said.

No one disputes the layers of rock that make up the canyon walls are ancient, dating back as much as 1.8 billion years, but there has been ongoing debate about exactly when the Colorado River began cutting through those layers, forming the giant serpentine chasm that draws millions of tourists.

Karlstrom and colleagues used thermochronology, a dating method that can measure the time when rocks were brought to Earth's surface due to erosion removing the layers of rock above, to date the entire canyon.

"I think we've resolved the 140-year-long debate about the age of the Grand Canyon," Karlstrom said.

While two stretches near the canyon's middle are ancient -- the eastern Grand Canyon is 15?25 million years old, and another stretch downriver is 50?70 million years old -- Marble Canyon, the farthest stretch upriver studied, plus the westernmost Grand Canyon, were carved far more recently, he said.

"Different segments of the canyon have different histories and different ages, but they didn't get linked together to form the Grand Canyon with the Colorado River running through it until 5 to 6 million years ago."

Karstrom's study has been published in the journal Nature Geoscience.

.


Related Links
Bringing Order To A World Of Disasters
When the Earth Quakes
A world of storm and tempest






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News





SHAKE AND BLOW
Two dead, 27 missing as flood engulfs Indonesia boat
Jakarta (AFP) Jan 26, 2014
A flash flood surged down a mountain and capsized a boat on the coast of a northern Indonesian island, leaving two people dead and 27 missing, a disaster official said Sunday. Eight people managed to escape when water engulfed the boat early Saturday on remote Siau island during a tropical downpour, the official said, in an area hit by deadly landslides and floods in recent weeks. "The f ... read more


SHAKE AND BLOW
Indonesia increases maritime patrols

Mayor of scandal-hit Italy quake town withdraws resignation

UK charity expands Philippine anti-trafficking work

Tornadoes, flood, drought cost US billions in 2013

SHAKE AND BLOW
Google says buys artificial intelligence firm DeepMind

'Gears of War' videogame will stay in Xbox arsenal

MDA awarded key development work for exploration and communications

Lenovo to buy IBM's low-end server business for $2.3bn

SHAKE AND BLOW
War on lionfish shows first promise of success

WTO sets up panel to rule on Mexico-US tuna label feud

Great Lakes study dispels many misconceptions

Australia's drinking water at risk from extreme weather events

SHAKE AND BLOW
Arctic Warmth Unprecedented in 44,000 Years

North and Tropical Atlantic Ocean bringing climate change to Antarctica

Polar bear diet changes as sea ice melts

New sea anemone species discovered in Antarctica

SHAKE AND BLOW
Pathogenic plant virus jumps to honeybees

Hong Kong to cull 20,000 chickens after H7N9 found

Halting crop destruction in India saves up to $309 million

No-till soybean fields give (even some rare) birds a foothold in Illinois

SHAKE AND BLOW
More Precise Hurricane Forecasts with NASA-NOAA Suomi NPP VIIRS Satellite Sensor

New, younger age determined for the Grand Canyon

Two dead, 27 missing as flood engulfs Indonesia boat

"Sedimentary Bathtub" Amplifies Earthquakes

SHAKE AND BLOW
Chinese ivory smuggler in Kenya to test tough new law

Talks to end Mozambique skirmishes resume

Mozambique president inaugurates Chinese-built palace

Sudan warplanes hit rebel-held town: Kordofan insurgents

SHAKE AND BLOW
Putting 'Adam' in his rightful place in evolutionary history

Finland's education success opens new business niches

Blue eyes and dark skin, that's how the European hunter-gatherer looked

Calcium absorption not the cause of evolution of milk digestion in Europeans




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement