See Angle Rock, Interstate Park, Wisconsin

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Enjoy a breathtaking view of the St. Croix River when you make the short walk to Angle Rock. At this point, the river makes a 90 degree turn and follows the path of an ancient rift. The rift was a series of large cracks that split the earth's crust 1.1 billion years ago. Lava spilled out of the rift and pooled over a large area from Canada, through Michigan, Wisconsin, eastern Minnesota, Iowa, Nebraska and Kansas. When the lava cooled and hardened, it became the basalt rock found throughout the park. Much later, the glacial St. Croix River rushed downstream and encountered the inactive rift in the basalt bedrock. It was easier for the river to wear through that crack, so it took a sharp curve to flow there.

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