Volcanic Landscape - Yellowstone National Park
Posted by: Groundspeak Premium Member Volcanoguy
N 44° 37.676 W 110° 25.999
12T E 544951 N 4941775
A geologic history sign at the Sulphur Caldron Overlook along the Grand Loop Road about 6 miles north of Lake Junction in Yellowstone National Park.
Waymark Code: WMDCPG
Location: Wyoming, United States
Date Posted: 12/25/2011
Published By:Groundspeak Premium Member muddawber
Views: 7

“You are inside the caldera of one of the largest volcanoes in the world! The volcano has erupted at least three times, and Yellowstone is full of signs that volcanic activity is still very much alive below ground.
On the Rise
Magma is moving and pushing underground, forcing the hill in front of you to rise! Two of these bulges or ‘resurgent domes’ have been found in the caldera. From here, you can see part of the Sour Creek dome -- an oval-shaped hill about ten miles long and six miles wide.
A Big Cooking Pot
Bubbling, steaming, and churning within Yellowstone’s caldera -- a Spanish word for a large cooking pot -- are thousands of mudpots, fumaroles, hot springs, and geysers.
Where’s the Rim?
Yellowstone’s caldera -- 30 miles wide and 45 miles long -- is so huge, it is difficult to imagine the massive eruption that created it! After the volcano exploded, lava continued to flow, filling in much of the caldera and making the crater and its rim hard to see.”
Marker Name: Volcanic Landscape

Marker Type: Rural Roadside

Group Responsible for Placement: National Park Service

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

Addtional Information: Not listed

Date Dedicated: Not listed

Marker Number: Not listed

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.
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