Can You Trust Your Eyes?
Posted by: Groundspeak Premium Member Volcanoguy
N 44° 25.102 W 121° 46.376
10T E 597685 N 4919073
This is one of many signs at the Mt. Washington Viewpoint on Hwy. 20.
Waymark Code: WM4ZD0
Location: Oregon, United States
Date Posted: 10/17/2008
Published By:Groundspeak Premium Member silverquill
Views: 25

This geological history sign is located on U.S. Hwy. 20 at the Mt. Washington Viewpoint.

Marker Name: Can You Trust Your Eyes?
Marker Text: In front of you stands sharp-peaked Mt. Washington. To your far left sits dark, cone-shaped Black Butte. Why do they look so different and which one is older?
To answer why, we must go back 25,000 years. A massive blanket of ice smothers Mt. Washington. Rivers of ice cascade down its flanks. It is these glaciers that grind down mountains and carve out valleys. To the east, out of reach of glaciers, Black Butte remains a dark sentinel.
Your eyes may tell you that Black Butte is younger, but it is 1.4 million years old, nearly five times the age of Mt. Washington.
Why Black Butte Has No Glaciers
Black Butte rises up, to your left, east of the Cascade Range. After storms cover Mt. Washington with snow and travel east, little snow is left to fall on Black Butte. No snow means no glaciers. No glaciers means smooth, symmetrical mountain sides.

Historic Topic: Geological

Group Responsible for placement: Forest Service

Marker Type: Roadside

Region: Central Oregon

County: Jefferson

State of Oregon Historical Marker "Beaver Board": Not listed

Web link to additional information: Not listed

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