Salty Old Cellulose: Tiny fibers found in ancient halite deposits
By Sid Perkins
Researchers have unearthed the planet’s oldest-known intact biological macromolecules, microscopic bits of cellulose from 253-million-year-old salt deposits in the southwestern United States.
![](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2008/04/7588.jpg?resize=300%2C270&ssl=1)
The remarkable preservation of the material suggests that under the right conditions, cellulose could last more than 1 billion years. Such a long-lived molecule, a chain of simple sugars, might give scientists searching for past extraterrestrial life on other planets a new target.