Fossils found in these layers include ... and sponges. Known as the Grand Canyon Supergroup, these layers of rock lie at an angle relative to the layers of rock above. The layer labeled Bass ...

As these changes have occurred, organisms have evolved, and remnants of some have been preserved as fossils ... rock record. For example, in the rocks exposed in the walls of the Grand Canyon ...

Scientists racing the clock to finish excavating top southern Utah dinosaur fossil site before construction on a power ...

Seeing these fossils allows one to visualize what the Grand Canyon area was like 270 million ... It is a geological feature in which no rock layers are in the geological record dating back ...