Cenomanian 5: Difference between revisions
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Couplet C45 of Gale (1995) contains an erosional surface that is interpreted as a sequence boundary (Gale et al., 1999). Above an interval of shelf margin wedge deposits at Folkestone, Jukes-Browne Bed 7 and an underlying marl with abundant ''Pycnodonte vesiculare'', are interpreted as a transgressive systems tract (Gale et al., 1999). The change to relatively pure carbonate higher in the succession and loss of conspicuous rhythmicity (e.g. the 'White Bed' of the North Downs) is indicative of a highstand (Gale et al., 1999). | Couplet C45 of Gale (1995) contains an erosional surface that is interpreted as a sequence boundary (Gale et al., 1999). Above an interval of shelf margin wedge deposits at Folkestone, Jukes-Browne Bed 7 and an underlying marl with abundant ''Pycnodonte vesiculare'', are interpreted as a transgressive systems tract (Gale et al., 1999). The change to relatively pure carbonate higher in the succession and loss of conspicuous rhythmicity (e.g. the 'White Bed' of the North Downs) is indicative of a highstand (Gale et al., 1999). | ||
Latest revision as of 08:08, 2 October 2013
Couplet C45 of Gale (1995) contains an erosional surface that is interpreted as a sequence boundary (Gale et al., 1999). Above an interval of shelf margin wedge deposits at Folkestone, Jukes-Browne Bed 7 and an underlying marl with abundant Pycnodonte vesiculare, are interpreted as a transgressive systems tract (Gale et al., 1999). The change to relatively pure carbonate higher in the succession and loss of conspicuous rhythmicity (e.g. the 'White Bed' of the North Downs) is indicative of a highstand (Gale et al., 1999).
References
GALE, A S. 1995. Cyclostratigraphy and correlation of the Cenomanian Stage in Western Europe. In HOUSE, M R & GALE, A S (eds.), Orbital Forcing Timescales and Cyclostratigraphy, Geological Society Special Publication, No. 85, pp. 177-197.
GALE, A S, HANCOCK, J M & KENNEDY, W J. 1999. Biostratigraphical and sequence correlation of the Cenomanian successions in Mangyshlak (W. Kazakhstan) and Crimea (Ukraine) with those in southern England. Bulletin de l'Institut Royal des Sciences Naturelles de Belgique, 69, 67-86.