The "Schistes carton" of Quercy (Tarn, France): a lithological signature of a methane hydrate dissociation event in the Early Toarcian. Implications for correlations between Boreal... by Emmanuel, L, Renard, M, Cubaynes, R, De Rafelis, M, Hermoso, M, Lecallonnec, L, Le Solleuz, A, Rey, J