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What is it?

Trail of Time's markers are installed

The Trail of Time is a 4.56 km (2.83 mile) long geologic timeline. Each meter walked on the timeline trail signifies one million years of Grand Canyon's geologic history. Walking the trail gives you a visceral appreciation for the magnitude of geologic time. Bronze markers mark your location in time; every tenth marker is labeled in millions of year! Along the timeline trail are a series of rocks and exhibits that explain how Grand Canyon and its rock formed.