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Utah’s Prehistoric Geography

Utah’s Prehistoric Geography. Forming Rocky Mountain Region. Some rocks from PRECAMBRIAN Era! Forming Mountains through Plate Pressures Uplift began in Mesozoic Era

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Utah’s Prehistoric Geography

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  1. Utah’s Prehistoric Geography

  2. Forming Rocky Mountain Region • Some rocks from PRECAMBRIAN Era! • Forming Mountains through Plate Pressures • Uplift began in Mesozoic Era • Earth’s surface crunched together by pressures from Pacific and Atlantic Oceans

  3. Forming Rocky Mountain Region • Forming Mountains through Volcanoes • Sometimes, volcanoes erupted and magma formed sharp peaks • Forming Mountains through Glaciers • As ice age melted, glaciers moved and carved

  4. Forming the Great Basin Region • Forming Basins • Some land was forced UP by faults (mountains) • Some land left flat and low (valley) • Creates a BOWL! Basin

  5. Forming Great Basin Region • Ancient Lakes • As the ice age (Cenozoic Age) melted away, lakes were left behind • Lake Bonneville filled basins • Over time, water evaporated • Left behind Great Salt Lake, Utah Lake, Sevier Lake • Volcanic Remains • Molten rock (lava) pushes through the earth’s crust • Craters and hardened lava

  6. Forming the Colorado Plateau Region • Forming Plateaus • Mountains were formed by faults • The mountains were squeezed in and up, creating top of plateau • Water and erosion washed away side walls, creating sheer cliffs and canyons • Forming other Rock Formations • Some magma pushed through earth’s crust • Formed by water and erosion

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