At 1.2-million-years-old, a newly uncovered Antarctic ice core represents the oldest known ice on the planet. The 1.7 mile-long ice core was recovered from over 9,000 feet (2,800 meters) deep ...

exists at the lowest 210 meters of the ice core – just above the bedrock. The old ice forming this base segment is heavily deformed – possibly mixed or refrozen, and of unknown origin.