Wikimedi'Òc

Cinder-Cone-Lassen-down-the-crater.jpg - Introvert

Rainbow Basin 0044.JPG - JJefferson~commonswiki

Inyo Crater Lakes - north crater - erosion on rim.JPG - Mav

HoleInTheWallTuff.JPG - Slick-o-bot

Road cut fault - Red Rock Canyon.jpg - The Cosmonaut

Inyo Crater Lake.jpg - Dicklyon

Rock formation in Robert Louis Stevenson State Park.JPG - Oleg Alexandrov

Volcanic Glass and Tuff.jpg - Inritter

Obispo tuff.jpg - Inritter

Obispo tuff2.jpg - Inritter

Volcanic Tuff in Shoshone in California.jpg - GeoWriter

Fault in Shoshone in California.jpg - GeoWriter

Volcanic Tuff and Volcanic Glass and Faults at Shoshone in California.jpg - GeoWriter

Volcanic tuff (Sonoma Volcanics, Upper Pliocene, 3.2-3.4 Ma; Calistoga Petrified Forest, Calistoga, California, USA) 7 (49092952557).jpg - Ser Amantio di Nicolao

Volcanic tuff (Sonoma Volcanics, Upper Pliocene, 3.2-3.4 Ma; Calistoga Petrified Forest, Calistoga, California, USA) 9 (49092975402).jpg - Ser Amantio di Nicolao

Volcanic tuff (Sonoma Volcanics, Upper Pliocene, 3.2-3.4 Ma; Calistoga Petrified Forest, Calistoga, California, USA) 20 (49092976337).jpg - Ser Amantio di Nicolao

Volcanic tuff (Sonoma Volcanics, Upper Pliocene, 3.2-3.4 Ma; Calistoga Petrified Forest, Calistoga, California, USA) 22 (49092778126).jpg - Ser Amantio di Nicolao

Jawbone Canyon - 51965100534.jpg - Ser Amantio di Nicolao