Modelling the Phanerozoic carbon cycle and climate; constraints from the 87 Sr/ 86 Sr isotopic ratio of seawater Francois, L. M. ; Walker, J. C. G. Abstract Publication: American Journal of Science Pub Date: February 1992 DOI: 10.2475/ajs.292.2.81 Bibcode: 1992AmJS..292...81F