MindMap Gallery Historical Timeline of the Grand Canyon
This is a mind map about the Grand Canyon's timeline, detailing significant events from its formation to modern times. The timeline begins approximately 70 million years ago with the geological formation and includes key historical milestones such as John Wesley Powell's expedition in 1869, the establishment of the Grand Canyon as a national park in 1919, and its designation as a UNESCO World Heritage Site in 1987.
Edited at 2024-04-27 04:59:24