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on Trail of Two Forests in the Mt. St. Helens region of South Cascades. "This particular cave is a lava tube formed 1950 years ago during an eruption when lava flowed from fissures on Mount St. Helens.

St Helens- WA----on Trail of Two Forests in the Mt. Helens region of South Cascades. "This particular cave is a lava tube formed 1950 years ago during an eruption when lava flowed from fissures on Mount St.