Pillow Basalt, Lopez Island, Washington.
|
Pillow basalt, named because individual blocks resemble pillows, form underwater. Along the west coast of North America, there are many exposures of pillow basalt, because they formed in a marine environment and were subsequently accreted to the continent.
On to the next slide: Aerial view of Mt. Rainier , Washington
Back to the last slide: Photomicrograph of basalt
Back to photos of volcanic rocks and features
Back to Geology photos