none 10.1144/jgs2012-044 Geological Society of London Geological Society of London 1881 61120600 44798 2024072322141300087 10.1144 2024-07-24T11:53:26Z 2013-03-13T12:59:33Z 19 Journal of the Geological Society JGS 0016-7649 2041-479X 03 13 2013 03 2013 170 2 A. S. Gale School of Earth and Environmental Sciences, University of Portsmouth, Burnaby Building, Burnaby Road, Portsmouth PO1 3QL, UK F. Surlyk Department of Geography and Geology, University of Copenhagen, Øster Voldgade 10, DK-1350, Copenhagen K, Denmark K. Anderskouv Department of Geography and Geology, University of Copenhagen, Øster Voldgade 10, DK-1350, Copenhagen K, Denmark Evidence from regional stratigraphical patterns in Santonian−Campanian chalk is used to infer the presence of a very broad channel system (5 km across) with a depth of at least 50 m, running NNW−SSE across the eastern Isle of Wight; only the western part of the channel wall and fill is exposed. Within this channel were smaller erosional structures (<10 m deep) that truncate originally horizontal bedding, are floored by hardgrounds, and locally have a basal fill of granular phosphorite. The entire channel system was progressively infilled by chalk, as demonstrated by the expanded succession of the lower Campanian Culver Chalk Formation. The beds of the channel fill are cut by small step faults, resulting from gravitational collapse. Complete burial had taken place by the base of the upper Campanian Portsdown Chalk Formation, which is of even thickness across the region. The structures are interpreted with reference to high-resolution seismic profiles through chalk channel systems described from the German sector of the North Sea, and the Santonian−Campanian of the eastern Paris Basin, and were formed by persistent bottom currents. Previous interpretations of the condensed Santonian−Campanian chalks in the eastern Isle of Wight, involving penecontemporaneous tectonic inversion of the underlying basement structure, are rejected. 03 13 2013 03 2013 281 290 10.1144/jgs2012-044 https://doi.org/10.15223/policy-002 10.1144/jgs2012-044 https://www.lyellcollection.org/doi/10.1144/jgs2012-044 https://www.lyellcollection.org/doi/pdf/10.1144/jgs2012-044 https://geoscienceworld.org/jgs/article-lookup?doi=10.1144/jgs2012-044 10.1016/j.sedgeo.2007.03.005 10.1016/S0016-7878(97)80014-4 10.1144/gsjgs.123.1.0157 10.1017/S0016756800139901 10.1017/S0016756800153038 10.1017/S001675680015318X 10.1017/S0016756800153336 Geological Society, London, Special Publications Inversion Tectonics Cartwright J.A. 153 1989 Cartwright J.A. 1989. The kinematics of inversion in the Danish Central Graben. In: , Cooper M.A., Williams G.D. (eds) Inversion Tectonics. Geological Society, London, Special Publications, 44, 153–175. 10.1016/j.marpetgeo.2009.05.001 Geological Society, London, Special Publications Economic and Palaeoceanographic Significance of Contourite Deposits Esmerode E.V. 265 2007 Esmerode E.V., Lykke-Andersen H., Surlyk F. 2007. Ridge and valley systems in the Upper Cretaceous chalk of the Danish Basin: contourites in an epeiric sea. In: , Viana A.R., Rebesco M. (eds) Economic and Palaeoceanographic Significance of Contourite Deposits. Geological Society, London, Special Publications, 276, 265–282. 10.1144/0016-76492006-138 10.1016/S0016-7878(00)80015-2 10.1144/0016-764903-056 10.1111/j.1365-3091.1980.tb01165.x Mesozoic Research Gale A.S. 107 1 1987 The lithostratigraphy and marker bed correlation of the White Chalk (Late Cenomanian–Campanian) of southern England Gale A.S., Bromley R.G., Wood C.J. 1987. The lithostratigraphy and marker bed correlation of the White Chalk (Late Cenomanian–Campanian) of southern England. Mesozoic Research, 1, 107–118. 10.1144/gsjgs.156.2.0327 10.1016/j.cretres.2007.04.006 Hopson P. 2005. A stratigraphical framework for the Upper Cretaceous Chalk of England and Scotland with statements on the Chalk of Northern Ireland and the UK Offshore Sector . British Geological Survey Research Reports RR05/01 . Society of Economic Paleontologists and Mineralogists, Special Publications Marine Phosphorites—Geochemistry, Occurrence, Genesis Jarvis I. 167 1980 10.2110/pec.80.29.0167 Jarvis I. 1980. The initiation of phosphatic chalk sedimentation—the Senonian (Cretaceous) of the Anglo-Paris Basin. In: , Bentor Y.K. (ed.) Marine Phosphorites—Geochemistry, Occurrence, Genesis. Society of Economic Paleontologists and Mineralogists, Special Publications, 29, 167–192. 10.1111/j.1365-3091.1992.tb01023.x 10.1016/S0016-7878(06)80011-8 10.1017/S0016756800034373 10.1017/S0016756806002421 10.1017/S0016756800010451 10.1111/j.1365-3091.1974.tb01780.x 10.1144/0016-764903-021 10.2110/jsr.2010.052 10.1016/j.sedgeo.2009.10.002 10.1016/S0016-7878(86)80065-7 10.1016/j.pgeola.2010.09.001 10.1144/gsjgs.148.2.0391 10.1016/S0016-7878(97)80031-4 Zentralblatt für Geologie und Paläontologie Mortimore R.M. 1349 11 1998 Dating the phases of the Subhercynian tectonic epoch: Late Cretaceous tectonics and eustatics in the Cretaceous basins of northern Germany compared with the Anglo-Paris Basin Mortimore R.M., Wood C.J., Pomerol B., Ernst G. 1998. Dating the phases of the Subhercynian tectonic epoch: Late Cretaceous tectonics and eustatics in the Cretaceous basins of northern Germany compared with the Anglo-Paris Basin. Zentralblatt für Geologie und Paläontologie, 11/12, 1349–1401. Mortimore R.M. Wood C.J. Gallois R.W. 2001. British Upper Cretaceous Stratigraphy . Geological Conservation Review Series 23 . 10.37570/bgsd-1985-34-19 10.1016/S0034-6667(98)00077-3 10.1016/j.revpalbo.2008.01.005 10.1111/j.1365-3091.1991.tb00375.x Geoscientist Rawson P.F. 21 11 2001 The Chalk Group—a revised lithostratigraphy Rawson P.F., Allen P., Gale A.S. 2001. The Chalk Group—a revised lithostratigraphy. Geoscientist, 11, 21. 10.1016/S0016-7878(08)80280-5 10.1080/25761900.2022.12131799 Grundfragen der vergleichenden Tektonik Stille H. 1924 Stille H. 1924. Grundfragen der vergleichenden Tektonik. Borntraeger, Berlin. 10.1111/j.1365-3091.2006.00842.x 10.1306/07100808035 10.37570/bgsd-2010-58-08 10.1144/gsjgs.155.6.0975 Van der molen A. 2004. Sedimentary development seismic stratigraphy and burial compaction of the Chalk Group in the Netherlands North Sea . Geologica Ultraiectina 248 . White H.J.O. 1921. A Short Account of the Geology of the Isle of Wight . Memoirs of the Geological Survey of Great Britain. 10.1016/S0016-7878(06)80006-4