• View of Grand Canyon National Park at sunset from the South Rim

    Grand Canyon

    National Park Arizona

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  • Expect Dry Conditions and Warm Temperatures Through the First Half of This Week

    Monsoonal weather patterns have moved into the Grand Canyon area decreasing fire danger. As a result, on Tuesday, July 8 at 8 a.m. fire managers lifted fire restrictions within Grand Canyon National Park. More »

  • Two Bats Collected in the Park Have Tested Positive for Rabies

    One on the North Kaibab Trail and the other at Tusayan Ruin/Museum. Any persons having physical contact with bats in Grand Canyon National Park, please call 928-638-7767. Rabies can be prevented if appropriate medical care is given following an exposure. More »

Ranger Minute - How Old? (mov)

Ranger Minutes are short audiocasts or videocasts in which a park ranger shares interesting stories and information about Grand Canyon National Park.

 

View from Mohave Point (West Rim)

nps photo by michael quinn

How Old Is The Grand Canyon ? - Duration 01m 58s
Written and Produced by David Smith
Available Downloads
Video for Windows/ Zune Video for iPod/ devices Transcript
11MB_WMV File 13MB_MP4 File 34kb PDF File
 
If you have the Quicktime Player on your computer (Mac or Windows) you should see a player on the right.
Click on the player to activate it, then, press the play button. It may take a few seconds for the video to start.

If your playback is uneven and you would rather download the file to your computer,
this is a direct link. (3.38MB MOV File)



 
Basic Answers to Geological Questions Downloadable


Often described as Earth's greatest geological showcase, the ensemble of stunning dimensions — the melding of depth, width, and length — sets Grand Canyon apart. Nowhere else features such a dazzling variety of colorful rock layers, impressive buttes, and shadowed side canyons. Grand Canyon is the Illustration: canyon against which all other canyons are compared.

Download Basic Answers to Geological Questions (292kb PDF File)
This is page 6 from the Grand Canyon Guide newspaper.

 
Some of the photos in Ranger David's presentation are from the United States Geological Survey's Grand Canyon Website. Click here to see more USGS photography of Grand Canyon National Park. This includes views along and within the canyon and a collection of historic images along the Colorado River taken by the Powell Expedition of 1872. Website images include both standard photograph and 3D views (as anaglyphs - requiring red-and-cyan 3D viewing glasses).

The Grand Age of Rocks: The Numeric Ages for Rocks Exposed within Grand Canyon
http://www.nature.nps.gov/geology/parks/grca/age/index.cfm


Did You Know?

GRAND CANYON TRILOBITE

The Cambrian seas of the Grand Canyon were home to several kinds of trilobite, whose closest living relative is the modern horsehoe crab. They left their fossil record in the mud of the Bright Angel Shale over 500 million years ago.