Description
"The side of the Yellowstone National Park Grand Canyon which was made by the Yellowstone River, It continues to carve its path through the mountains, reaches a maximum depth of 1,540 feet a short distance down-river from Artist Point. The colors are wonderful and ever-changing. The river has cut through many layers of the same rhyolite that forms so much of the park. It is naturally gray or light pink but iron compounds in varying amounts have stained it shades of orange and yellow - the yellow stone that gave a name to the river and the park."