I believe I read that DNA was extracted from a 224 million year old bacteria that was trapped inside a salt crystal. (I'll look and post on it if I find anything)
Thirty Million-Year Sleep: Germ Is Declared Alive!
There were much older spores waiting to be revived. On May 19, 1995, The New York Times carried a front-page story about them (4). Biologists Raul Cano and Monica Borucki had extracted bacterial spores from bees preserved in amber in Costa Rica. Amber is tree-sap that hardens and persists as a fossil.
This amber had entrapped some bees and then hardened between 25 and 40 million years ago.
Bacteria living in the bees' digestive tracts had recognized a problem and turned themselves into spores. When placed in a suitable culture, the spores came right back to life.
As a control, the two biologists also attempted to culture from the same amber a number of samples that contained no bee parts. These cultures were negative, adding credibility to the experiment. This finding was originally reported in the journal Science (5) to general acceptance.
It's Alive! A 250-Million-Year-Old Bacterium Found In Salt Crystal