Geology

Heather Meadows in the Mt. Baker Wilderness

Mountains dominate most of the national forests in Washington and Oregon.  Some are ancient- like the Blue Mountains of southeast Washington and northeast Oregon.  Others are much younger and continue to remind us that geology is dynamic- the impressive Big Obsidian Flow on the Deschutes National Forest is only 1,300 years old while Mount St. Helens on the Gifford Pinchot National Forest lost 1,314 feet of elevation when it erupted in 1980.

 

Volcanoes of the Cascade Mountain Range:





https://www.fs.usda.gov/detail/r6/learning/nature-science/?cid=fseprd570124