The Wenatchee Valley Erratics, Ice Age Floods Institute’s next Zoom program will be on Tuesday, April 12 at 7:00 PM. Dr. Ralph Haugerud, USGS/UW, will discuss, “How are mountains made? The origins of local relief in the North Cascades.”

Mountains are made by uplift and erosion. In the North Cascades, folding, faulting, and granite intrusions thickened the crust about 105-50 million years ago. But the associated uplift probably eroded away fairly quickly. Volcanic activity created some modern high elevations, such as Mt Baker and Glacier Peak. Up-folding built other high areas, such as the Naneum Ridge anticline, which extends to the northwest through the Mt Stuart massif. Regional uplift probably has deeper causes.

While we hypothesize the causes of uplift, the story of erosion is more obvious. During our talk, we will show evidence of several local erosional events in the North Cascades.

Zoom link: https://us02web.zoom.us/j/84812873290?pwd=ZlBnMHVDWmtYNEJHQ283V1kxWXA1QT09
Webinar ID: 84812873290
Passcode: erratics

Please sign in at 7:00 PM, April 12!