The rocks and boulders of Joshua Tree National Park are every bit as distinctive as the trees themselves. Huge rounded granite formations rise from the desert in stacks, walls, and isolated piles, often looking as though they were carefully placed there by hand.
These formations began deep underground, where molten rock cooled and hardened into granite. Over millions of years, cracks formed in the granite and water slowly weathered the exposed surfaces. As the surrounding soil and softer material eroded away, the massive rounded boulders we see today were gradually revealed.
Sunlight gives the rocks an ever-changing character. In the early morning and late afternoon, low light emphasizes their textures, cracks, and warm colors, while deep shadows create dramatic shapes between the boulders. Some seem balanced impossibly on top of one another, adding to the strange and beautiful landscape.
Together with the Joshua trees, these ancient granite formations give the park its unmistakable appearance—a landscape shaped slowly by geology, weather, and time.