The stanol : Δ5-sterol ratio as a proxy for palaeoredox conditions in mires Bingham, E. M. ; McClymont, E. L. ; Childs, E. V. ; Pancost, R. D. ; Charman, D. ; Evershed, R. P. Abstract Publication: Geochimica et Cosmochimica Acta Supplement Pub Date: June 2009 Bibcode: 2009GeCAS..73R.124B