Toarcian Stage

Division representing all rocks deposited worldwide during the Toarcian Age (193 - 187 million years ago). The Toarcian is the fourth of 11 divisions (in ascending order) that make up the Jurassic System and is the uppermost stage of the Early Jurassic. No global stratotype section and point (GSSP) for the base of the stage has been approved by the International Commission on Stratigraphy.