How Are Mountains Made?
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 […]