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.

A geologic cross section of the Grand Canyon, described along the Trail of Time, includes the following layers from youngest to oldest: Compared to these old, old rocks in its walls, Grand Canyon ...

The newly named rock layer has lain hidden in plain sight throughout the Grand Canyon for millennia ... an emeritus professor of geology at UNLV and paleontologist at the Las Vegas Natural ...

The Cambrian-age Tonto Group is a set of rocks famous for holding clues to the burst of new life that reshaped Earth 500 ...

and some of their amazing fossils have been preserved in the park's gorgeous geology, which scientists have revealed. The uppermost rock layers at the Grand Canyon are composed of what geologists ...

Our final stop during spring break was the Grand Canyon ... to the edge of a geologic wonder created by chaos and pressure. Two billion years ago, sediments formed the layers of rocks in the ...

Wikimedia CommonsThe Grand Canyon ... identical to those rock layers in the Grand Canyon. Researchers at Monash University in ...

"The Tonto Group of Grand Canyon holds a treasure trove of sedimentary layers and fossils chronicling ... paper author and Utah State University geology professor Carol Dehler said in a statement.

Over geologic eons ... Canyon is located on what geologists refer to as “The Grand Staircase,” an immense sequence of sedimentary rock layers that stretches south for 100 miles from Bryce Canyon ...