Researchers have discovered 6-million-year-old-ice and air in shallow ice cores drilled in the Allan Hills region of East Antarctica. They speculate that this ancient ice reflects surface snowpack or permafrost that was preserved by the growth of the East Antarctic ice sheet in the Middle to Late Miocene epoch. Ancient ice from the ALHIC1902 ice core. Image credit: Shackleton et al., doi: 10.1073/pnas.2502681122. “Ice cores are like time machines...
