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The Global Stratotype Section and Point for the base of the Sinemurian, the second stage of the Lower Jurassic (Lias), is exposed in the cliff north of the village of East Quantoxhead, around 6 km east of Watchet, in the administrative district of West Somerset, southwestern England. The boundary level is 0.90 m above the base of Bed 145 coinciding with the first appearance of the genera Vermiceras (V. quantoxense, V. palmeri) and Metophioceras (M. sp. indet. 1). The basal ammonite assemblage of the Sinemurian in the GSSP is earlier than all other assemblages known elsewhere in Europe. In Europe, a stratigraphical gap between both stages is generally present. Correlation with other faunal provinces is possible using the first appearance of Metophioceras s. str.

Global Stratotype Section and Point for base of the Sinemurian Stage (Lower Jurassic)