Fractured Limestone: The Catastrophic Geophysics of the Frank Slide

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At the turn of the twentieth century, the town of Frank in Alberta, Canada, was a booming coal mining settlement nestled at the base of Turtle Mountain. The indigenous Blackfoot and Kutenai populations had long avoided the peak, calling it "the mountain that moves." In the spring of 1903, the European miners discovered the terrifying truth behind that legend. In the dead of night, a catastrophic structural failure occurred within the mountain's limestone fault lines. Water had seeped into the deep cracks and frozen, acting like a massive geological wedge. Within ninety seconds, over 110 million tons of solid rock broke away and cascaded down the slope at speeds exceeding 70 miles per hour, completely burying the eastern half of the sleeping town under an ocean of impenetrable boulders. This historical deep-dive deconstructs the extreme geophysics of North America's deadliest rockslide. You will analyze the dangerous coal mining practices that hollowed out the mountain's structural integrity, the fluid-like behavior of massive rock avalanches, and the incredible survival stories of miners trapped deep underground. Examine the raw, devastating power of gravity. Discover how geological instability and industrial hubris triggered the sudden, catastrophic erasure of a thriving frontier town.

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