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The Baraboo Quartzite, before metamorphism, was laid down as sand ~1.7 billion years ago. Here, the bedding is tilted up to vertical due to a large synclinal fold that forms the Baraboo Hills of Wisconsin. You're actually looking at the underside of the layers here-- making it effectively a cast of the ripples that exi...
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- 51
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This rock, named after geologist Charles Van Hise, is a National Historic Landmark. Between two layers of quartzite - vertical here - is a layer of phyllite that has been sheared because of its sandwiched position. As the entire unit of rock folded into a large syncline, the stronger quartzite layers slid past each oth...
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A zone of breccia exists parallel to bedding in this location. The red rock is the quartzite, which is surrounded by a matrix of quartz. The breccia is thought to be related to hydrothermal activity, not faulting.
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This outcrop of the Baraboo Quartzite shows both gorgeous cross-bedding and ripple surfaces.
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At Ableman's Gorge, a former quarry, 1.7 billion year old ripple marks form a vertical wall scores of feet high. Stop and think about what that means -- the sand that eventually became this rock was laid down at a time when the only living things on planet were unicellular. And the forces that can stand this up to vert...
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