Fossils Fossil Record Fossil Discovery Amber Fossil Discoveries Fossil Analysis Climate History Chemical Fossils Ancient Earth Geohydrology Mass Extinction Antarctica Sedimentology Fossil Evidence Macrofossils Ediacaran Biota Ancient Life Fossil Hunting Sedimentary Rocks Fossil Studies Dinosaurs Paleo-tsunami Studies Dinosaur Fossils Fossil Dating Fossil Tracks Ancient Environments Fossil Sites Pleistocene Epoch Devonian Period Archaeology Continental Drift Fossilization Processes Stratigraphy
Trapped air in Allan Hills blue‑ice cores reveals unexpectedly low and steady greenhouse‑gas concentrations in the late Pliocene and early Pleistocene.