The Land Tells the Story - Yellowstone National Park
Posted by: Groundspeak Premium Member Volcanoguy
N 44° 57.654 W 110° 34.052
12T E 534108 N 4978697
A geologic history sign along the half mile long boardwalk for the Forces of the Northern Range Self-Guiding Trail in Yellowstone National Park.
Waymark Code: WMD9Z6
Location: Wyoming, United States
Date Posted: 12/11/2011
Published By:Groundspeak Premium Member muddawber
Views: 2

“The rocky outcropping in front of you tells part of a violent story of Yellowstone’s volcano -- one of the largest volcanoes on Earth.
About two million years ago Yellowstone’s volcano -- so enormous that it is called a ‘supper volcano’ -- exploded violently, coating the earth with ash for thousands of miles! Near the eruption, ashfall buried the ground in deep layers. Then the ash became compressed or ‘welded’ creating a layer of rock now called ‘Huckleberry Ridge Tuff.’
Yellowstone’s super volcano erupted two more times. The most recent eruption left a gigantic crater, or caldera, in the heart of Yellowstone. This massive caldera, about 30 miles wide and 45 miles long, was first verified with the use of satellite photography.
Yellowstone’s immense eruptions were many times larger than the catastrophic Mount St. Helens, Washington, explosion in 1980.
Yellowstone’s Big Blasts
Yellowstone’s volcano is still alive today. Two dome-like areas rise and fall as magma moves beneath the park. Although geologists cannot predict when it will erupt again, these ‘resurgent domes’ give clues about the future.”
Marker Name: The Land Tells the Story

Marker Type: Rural Roadside

Addtional Information:
The three giant Yellowstone volcanic eruptions 0.64 million years ago -- 240 cubic miles 1.3 million years ago -- 67 cubic miles 2.1 million years ago -- 600 cubic miles Worldwide historic eruptions 1883 eruption of Krakatau -- 4.3 cubic miles 1980 eruption of Mt. St. Helens -- 0.24 cubic miles 1991 eruption of Mt. Pinatubo -- 2.4 cubic miles

Group Responsible for Placement: National Park Service

Web link(s) for additional information: [Web Link]

Date Dedicated: Not listed

Marker Number: Not listed

Visit Instructions:
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Volcanoguy visited The Land Tells the Story - Yellowstone National Park 09/29/2010 Volcanoguy visited it