Pillow Basalts (U.S. National Park Service)

Pacific Ocean pillow basalt

A photo of pillow basalt

Pillow Basalts (U.S. National Park Service)

A photo of basalt pillows.

Rock On: 11 Lesser-Known Geologic Wonders in National Parks · National Parks Conservation Association

Dosewallips River Road — Washington Trails Association

National Park Pillows & Cushions for Sale

Pillow Basalts (U.S. National Park Service)

Ice Age Floods: Basaltic Lava Pillows - Pillow Basalts

Ice Age Floods: Basaltic Lava Pillows - Pillow Basalts

Denali National Park and Preserve - Wikipedia

Devils Postpile National Monument, California

Pillow basalt exposures in the Columbia River basalts - Mountain Beltway - AGU Blogosphere

Rock On: 11 Lesser-Known Geologic Wonders in National Parks · National Parks Conservation Association