Carbonado, a polycrystalline variety of diamond, is characterized by unusual carbon isotope compositions with bulk δ13C values clustered tightly between −23 and −30‰ (relative to PDB). These values are significantly lighter ...
The contributions that Rob Hargraves made to paleomagnetism spanned not only great distances (from the Earth to Mars) but a vast expanse in time. His interests in the magnetic character of the Archean Earth led him to ...