Analysis of selected bands of the late Archean Mt. McRae Shale
found in the upper 200 meters of the ABDP-9 core provide evidence of
oxygen in Earth's atmosphere 50-100 million years earlier than
previously known. The project, financially supported by NASA and NSF,
brought researchers together from five universities, including Arizona
State University, where the core samples used for research are housed.
Also pictured is a vial of processed -- pummeled -- rock powder used for