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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 look 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.