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The United States Geological Survey was responsible for studying the landscape of the United States, its natural resources, and the natural hazards that may threaten it. The scientific disciplines of biology, geography, geology, and hydrology were utilized to better understand how to harness and protect the environment. After the Great War, former American soldier and survivalist Randall Clark sought refuge in Fallen Rock cave in Zion Canyon, which was being used as a USGS research station until the team left. Clark speculated that they hoped to find their families.