The researchers noted in their paper that although “possible survival of microorganisms over geologic time scales is not fully understood,” the Browne prokaryotes, if found to definitely be alive, could have huge implications for the search for life on Mars, where rock compounds similar to the Browne Formation are abundant.
If you want the Andromeda strain this is how you get the Andromeda strain.
Elderly microbes.
...and they haven’t evolved?!?