%0 Journal Article %J Nature %D 2012 %T Uncovering the Neoproterozoic carbon cycle %A Johnston, D.T. %A Macdonald, F.A. %A Gill, B.C. %A Hoffman, P.F. %A Schrag, D.P. %B Nature %V 483 %P 320-323 %G eng %N 7389