17 January 2003
Vol 299, Issue 5605

About The Cover

Cover image expansion

COVER Raised rings of stones surrounding circular fine-grained domains (circle in foreground, diameter ~2 m) on Kvadehuksletta, western Spitsbergen. These features are only a small subset of the diverse patterns of stones and soil--including labyrinths, stone islands, sorted stripes, and sorted polygon networks--that self-organize in periglacial regions, as discussed on page 380. [Photo: M. A. Kessler]