ASU biogeochemist Ariel Anbar and an international team of
scientists who analyzed layers of sedimentary rock in a kilometer-long
core sample from the Hamersley Basin in Western Australia report finding
evidence of a hint of oxygen in Earth's atmosphere 50 to 100 years
earlier than previously known. Sliced longitudinally, half of the core
is housed in laboratories at Arizona State University and the other half
is archived at the Geological Survey of Western Australia.