Episodes 2002; 25(1): 22-28
Published online March 1, 2002
Copyright © International Union of Geological Sciences.
Gert Bloos1, Kevin N. Page2
1Staatliches Museum fuer Naturkunde, Rosenstein 1, D-70191 Stuttgart, Federal Republic of Germany.
2Department of Geological Sciences, University of Plymouth, Drakes Circus, Plymouth PL4 8AA, United Kingdom.
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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.