We're on the Giant Logs Trail now. It is behind the Petrified Forest VC. We are somewhat elevated here. It shows you where the water was that washed these pebbles.

About 218 million years ago, flood waters carried fallen trees to this spot. After being quickly covered with sediment they slowly petrified their organic matter replaced by silica minerals over millions of years. Some of these prehistoric trees stood 200 feet tall. This pile-up of logs is an ancient log jam, brought to the surface again through erosion.