John Wesley Powell A professor of geology at Illinois Wesleyan ... and sponges. Known as the Grand Canyon Supergroup, these layers of rock lie at an angle relative to the layers of rock above.

The Grand Canyon is a breathtaking geologic wonder located in the northern part of the state of Arizona, USA, with its rock layers dating back a million years laid bare before the eye. Scientists ...

The layers of rock revealed by erosion ... Liz Bonnin introduces the Grand Canyon with its complex and very ancient geology. The Grand Canyon was carved out of rock by the Colorado River over ...

Relative dating puts geologic events in chronological order ... it is possible to work out the relative ages of rocks. In the Grand Canyon, the layers of strata are nearly horizontal.

In addition to heart-pumping aerial footage, viewers will enjoy an overview of the Grand Canyon's history and a CGI animation of the canyon's geological formation. Worth noting, this is not shown ...

Relative dating puts geologic events in chronological order ... it is possible to work out the relative ages of rocks. In the Grand Canyon, the layers of strata are nearly horizontal.