Volcanic Landscape - Yellowstone National Park
Posted by: 
Volcanoguy
N 44° 27.747 W 110° 51.295
12T E 511541 N 4923248
A geological history sign along the boardwalk trail in the Black Sand Geyser Basin of Yellowstone National Park.
Waymark Code: WMDYBP
Location: Wyoming, United States
Date Posted: 03/08/2012
Views: 14
“The high cliffs around you were created after the last volcanic eruption in the Yellowstone region, about 630,000 years ago. The powerful eruption ejected ash as far away as Nebraska and Texas, expelling magma from an underground chamber more than 30 miles in diameter. As the roof of the chamber collapsed, a caldera or crater, was formed spanning nearly half of Yellowstone National Park. In time, massive lava flows, filled the caldera, creating the present landscape including the cliffs before you.”
Marker Name: Volcanic Landscape
Marker Type: Rural Roadside
Addtional Information:
Group Responsible for Placement: National Park Service
Date Dedicated: Not listed
Marker Number: Not listed
Web link(s) for additional information: Not listed
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Visit Instructions:
Please post a photo of you OR your GPS at the marker location. Also if you know of any additional links not already mentioned about this bit of Wyoming history please include that in your log.