A Walk Along a Geologic Timeline #1 - California
Posted by: 
Volcanoguy
N 40° 26.278 W 121° 32.020
10T E 624364 N 4477401
Rock display at Kohm Yah-mah-nee Visitor Center.
Waymark Code: WMJR76
Location: California, United States
Date Posted: 12/22/2013
Views: 2
One of four large volcanic boulders around the Kohm Yah-mah-nee Visitor Center near the south entrance to Lassen Volcanic National Park.
Text of display sign:
The Massive Mudflow
This boulder was created between five and three million years ago, when massive volcanic mudflows (the Tuscan Formation) covered what is now Lassen Volcanic National Park.
Over three million years ago powerful mudflows, or lahars, rushed down the flank of Mount Yana, covering a 2,000-square mile (approximately 5200 sq km) area — including what is now Lassen Volcanic National Park — with a slurry of water-saturated ash and volcanic debris. Known as the Tuscan Formation, this lahar deposit may be up to
Type of Display: Geological
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