Pillow basalt and palagonite, part of Columbia River Basalt Group, formed by lava flowing into a lake during the Miocene.

- Image ID: W006HB

Pillow basalt and palagonite, part of Columbia River Basalt Group, formed by lava flowing into a lake during the Miocene.

Marli Miller / Alamy Stock Photo

Image ID: W006HB

Location: Oregon, USA