Right at the base of Pikes Peak in Colorado, you will find a park packed with giant red rocks. But these are not just normal boulders sitting on the ground.

The rocks at the Garden of the Gods look like giant fins. They are tall, thin, and just straight up into the sky. Some of them reach over 300 feet high. They are incredibly narrow, making them look like giant red blades cutting through the grass. They look like they were planted there on purpose, but it all comes down to how the Rocky Mountains formed.

garden of the gods; colorado
Photo: Jeremy Janus from Getty Images

Flat Rocks Pushed Upward

Millions of years ago, this area was mostly flat. An older mountain range eroded and dumped thick layers of sand, gravel, and mud across the landscape. Over time, that material compacted into hard, horizontal layers of red sandstone, limestone, and conglomerate.

For a long time, these rock layers just sat flat under the ground. If nothing else had happened, they would still be lying flat right now.

The Power of a Mountain Range

But something huge did happen. About 65 million years ago, tectonic plates collided. This massive collision pushed the Earth’s crust upward, building the modern Rocky Mountains.

garden of the gods; colorado

Advertisement

Photo: William Reagan from Getty Images

As the giant granite mountains pushed up from below, they caught the edges of those flat sandstone layers. The rising mountains bent the flat rock layers upward, forcing them to stand almost completely vertical.

Carved by Ice and Rain

Once the rock was tipped on its side, the weather took over. Rain, snow, and ice beat down on the exposed edges.

garden of the gods; colorado
Photo: Jeremy Janus from Getty Images

When the last Ice Age hit, massive glaciers formed high up on Pikes Peak. As those glaciers melted, huge amounts of water rushed down the mountain. This meltwater acted like a giant saw, tearing through the weaker vertical rocks and leaving only the hardest red fins standing.

The iron inside the sandstone rusted over time, giving the rocks their bright red color. It creates a crazy contrast. You have these bright red, vertical sandstone fins sitting right in front of a massive, gray mountain peak. It is a perfect snapshot of how violent mountain building can completely tear up a landscape.