Creosote bushes start to grow outward as they get older. The center starts to die out and a ring is left. Creosote rings are some of the oldest plants in existence and have been dated to 10,000 years old.
Hill
Master Guide
Registered: 10/31/04
Posts: 10669
Loc: Los Angeles, California
There is more about creosote rings here, with a description of the oldest one found. It is estimated to be 11,700 years old and to have been alive at the end of the last ice age
_________________________ A Pale Blue Dot: Earth from Voyager 1 at a distance of about 4 billion miles.
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