The Withington Caldera
Posted by: Groundspeak Premium Member Volcanoguy
N 45° 00.234 W 113° 37.950
12T E 292532 N 4986755
Quick Description: Geological history sign at Lewis and Clark Back Country Byway interpretive Site on Warm Springs Road.
Location: Idaho, United States
Date Posted: 8/27/2012 5:25:30 PM
Waymark Code: WMF5R1
Published By: Groundspeak Premium Member muddawber
Views: 1

Long Description:
One of five signs located around the Lewis and Clark Back Country Byway Kiosk along Warm Springs Road west of Lemhi Pass.
Marker Name: The Withington Caldera

Marker Type: Roadside

Marker Text:
About 50 million years ago, this was one of the most violent landscapes on earth. A sub-surface mass of molten rock rose and subsided in cycles, spewing gas, mineral fragments and ash in explosions hundreds of times more powerful than an atomic bomb. When it was all over, igneous rock thousands of feet thick covered the land and there was a broad, shallow crater or caldera across the valley from this site. Geological forces that created the Beaverhead Mountains behind you and Lemhi Range before you buckled the caldera beyond recognition, but the rock it created is still visible.


County: Lemhi

Group Responsible for Placement: BLM

City: Not listed

Date Dedicated: Not listed

Marker Number: Not listed

Web link(s) for additional information: Not listed

Visit Instructions:
In your log, please say if you learned something new, and if you took any extra time to explore the area once you stopped at the historic marker waymark. If possible 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 Idaho history please include that in your log.

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Recent Visits/Logs:
Date Logged Log User Rating  
Volcanoguy visited The Withington Caldera 10/7/2010 Volcanoguy visited it