Wednesday, May 18, 2011

Factoid of the day

Arthur's seat isn't the only "volcanic plug" that is famous.


. If a plug is preserved, erosion may remove the surrounding rock while the erosion-resistant plug remains, producing a distinctive upstanding landform. Examples include Shiprock, New Mexico; The Nut, Australia; and the Pitons of Saint Lucia.


webecoist has photos of some of the more famous ones around the world, including Devil's Tower, at the edge of the Blackhills, where I used to picnic when I worked in South Dakota.

but you probably know it best from this film:

No comments: