Cresta S, Goy A, Ureta S, Arias C, Barrón E, Bernad J, Canales ML, Joral FG, Romero EG, Gialanella PR, Gómez JJ, González JA, Herrero C, Martínez G, Osete ML, Perilli N, Villalaín JJ.  The Global Boundary Stratotype Section and Point (GSSP) of the Toarcian-Aalenian Boundary (Lower-Middle Jurassic).  Episodes 2001;24:166-175.  https://doi.org/10.18814/epiiugs/2001/v24i3/003