Grand teton national park

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  • During the past 13 million years, the Teton mountain range has risen upward and the valley has dropped by about 23,000 feet.

  • Perhaps as many as 20 magnitude 7.3 quakes since the glaciers receded about 14,000 years ago have contributed to the changing topography of Teton.

The Teton Fault

Jackson Lake Dam

  • The dam impounds irrigation water for agriculture downstream of the Snake River and also provides flood control.

  • The dam was upgraded in the late 1980s and is now believed to be able to withstand the “maximum credible earthquake”- a magnitude 7.5 quake.

Signal Mountain Part 1

  • Panoramic views of Teton Range, Jackson Lake, Jackson Hole’s glaciated landscape, and the Snake River drainage can be seen.

  • The overlook where we stood would have been under more than 1000 feet of ice in the last glacial stage, which ended about 14000 years ago.

Signal Mountain Part 2

  • The bumpy plains viewed from this spot are known as knob-and-kettle topography - small hills of glacial debris, plus ponds, or potholes left when the glaciers receded.

  • Also, a dozen small glaciers still persist on the tops of the the Tetons.

Mount Moran

  • The northernmost of the high peaks in the Teton Range, it reaches a height of 12,605 feet.

  • The peak is topped by a thin layer of rock called Flathead sandstone, formed when the area was once a seafloor.

Cathedral: Scarp

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