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    Formations on Spring Brook North Trail

    Great for: Geology, nature

    Spring Brook North Trail

    Park on Hwy. 67 at the Fowler Trailhead. Hike Fowler and take a left on the Spring Book Loop North trail. Just as you begin uphill. keep an eye out for wavy-looking rock surfaces on your right (west) side. These are actually exposed cliffs of Dakota Sandstone, and 100 million years ago, this area was a sandy beach, now preserved in the rock. 

    Resources: Here’s an excellent educational, self-guided trek put together by the City of Boulder.