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Abstract

New material of Roveacrinidae from the middle–upper Cenomanian Grey Chalk Group of the Kent coast (Folkestone-Dover) is described. The fauna includes 10 taxa, including a new genus and species ( Dubrisicrinus minutus) and three new species ( Styracocrinus shakespearensis, Roveacrinus aboudaensis and Dentatocrinus serratus). The biostratigraphical significance of roveacrinid faunas is placed in a global context, and it is demonstrated that the roveacrinid zone CeR5, previously recorded only from Morocco, is approximately equivalent to the upper middle Cenomanian Acanthoceras jukesbrownei ammonite Zone, and zone CeR6 – to the Calycoceras guerangeri ammonite Zone. The new material also provides novel information on the cup structure of roveacrinids, which is reviewed and placed in a phylogenetic context.
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Authors and Affiliations

Andrew Scott Gale
1

  1. School of Earth and Environmental Sciences, University of Portsmouth, Burnaby Building, Burnaby Road, Portsmouth PO1 3QL, United Kingdom
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Abstract

Rare erratic clasts – extraneous rock types – occur in the Upper Cretaceous Chalk, including a local basal facies, the Cambridge Greensand. The underlying Upper Albian Gault Clay and the Hunstanton Red Chalk Formations have also yielded erratics. The discovery of these erratics, their description and the development of hypotheses to explain their origins and significance are reviewed. They became the subject of scientific interest with the interpretation of a particularly large example “The Purley Boulder” by Godwin-Austen (1858) as having been transported to its depositional site in the Chalk Sea by drifting coastal ice. Thin section petrography (1930–1951) extended knowledge of their diverse provenance. At the same time the Chalk Sea had become interpreted as warm, so drifting ice was considered out of context, and the preferred agents of transport were entanglement in the roots of drifting trees, as holdfasts of floating marine algae, or as stomach stones of marine reptiles or large fish. Reconsideration of their occurrence, variable nature and sedimentary setting suggests that there are three zones in the English Chalk where erratics may be less rare (1) near the base of the Cenomanian in the Cambridge area, (2) the Upper Cenomanian–Middle Turonian in Surrey, and (3) the Upper Coniacian and Lower Santonian of Kent. The assemblage from each level and their sedimentary setting is subtly different. Present evidence suggests that the erratics found in the Upper Albian–Lower Cenomanian and the Upper Cenomanian–Middle Turonian zones represent shallow water and shoreline rocks that were transported into the Chalk Sea by coastal ice (fast-ice) that enclosed coastal marine sediments as it froze. The Upper Coniacian and Lower Santonian erratics from Rochester and Gravesend in Kent are gastroliths.
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Bibliography

Ballantyne, C.K. 2018. Periglacial Geomorphology. 454 pp. John Wiley and Sons; Hoboken.
Ben, D.I. and Evans, D.J.A. 2013. Glaciers and glaciation. 2nd Edition, 802 pp. Routledge; London and New York.
Bennett, M.R. and Doyle, P. 1996. Global cooling inferred from dropstones in the Cretaceous – fact or wishful thinking? Terra Nova, 8, 182–185.
Bennett, M.R., Doyle, P. and Mather, A.E. 1996. Dropstones – their origins and significance. Palaeogeography, Palaeoclimatology, Palaeoecology, 121, 331–339.
Bonney, T.G. 1873. On the Upper Greensand or Chloritic Marl of Cambridgeshire. Proceedings of the Geologist Association, 3, 1–20.
Cayeux, L. 1897. Craie du Bassin de Paris. Mémoire de la Societé géologique du Nord, 4, 418–425.
Chumakov, N.M. 1998. Stones scattered in Cretaceous deposits of south England. Lithology and Mineral Resources, 33, 313–326.
Cope, J.C.W., Ingham, J.K. and Rawson, P.F. (Eds) 1992. Atlas of Palaeogeography and Lithofacies. Geological Society London, Memoir, 13, 153 pp.
Dibley, G.E. 1918. Additional notes on the Chalk of the Medway valley, Gravesend, west Kent, north-east Surrey, and Grays (Essex). Proceedings of the Geologists’ Association, 29, 68–93.
Double, I.S. 1931. Some boulders from the Chalk of Betch- worth, Surrey. Geological Magazine, 68, 65–71.
Dowdeswell, J.A., Elverhøi, A., and Spielhagen, R. 1998. Glacimarine sedimentary processes and facies on the polar north Atlantic margins. Quaternary Science Reviews, 17, 243–272.
Fletcher, T.P. 1977. Lithostratigraphy of the Chalk (Ulster White Limestone Formation) in Northern Ireland. Report of the Institute of Geological Sciences, 77/24.
Forbes, D.L. and Taylor, R.B. 1994. Ice in the shore zone and the geomorphology of cold coasts. Progress in Physical Geography, 18, 59–89.
Gallois, R.W. 1994. Geology of the country around King’s Lynn and The Wash. Memoir of the British Geological Survey, sheet 145 and part of 129 (England and Wales), 210 pp. HMSO; London.
Gilbert, R. 1990. Rafting in glaciomarine environments. In: Dowdeswell, J.A. and Scourse, J.D. (Eds), Glaciomarine environments: processes and sediments. Geological Society London, Special Publications, 53, 10–20.
Godwin-Austen, R. 1858. On a boulder of granite found in the “White Chalk” near Croydon, and on the extraneous stones from that Formation. Quarterly Journal of the Geological Society of London, 14, 252–266.
Godwin-Austen, R. 1860. On the occurrence of a mass of coal in the Chalk of Kent. Quarterly Journal of the Geological Society of London, 16, 326–327.
Grove, R. 1976. Coprolite mining in Cambridgeshire. The Agricultural History Review, 24, 36–43. Haq, B.U. 2014. Cretaceous eustacy revisited. Global and Planetary Change, 113, 44–58.
Hansom, J.D., Forbes, D.L. and Etienne S. 2014. The rock coasts of polar and sub-polar regions. In: Kennedy, D.M., Stephenson, D.M. and Naylor, L.A. (Eds), Rock Coast Geomorphology: A Global Synthesis. Geological Society London, Memoirs, 40, 263–281.
Hawkes, L. 1943. The erratics of the Cambridge Greensand; their nature, provenance, and mode of transport . Quarterly Journal of the Geological Society of London, 99, 93–104.
Hawkes, L. 1951. The erratics of the English Chalk. Proceedings of the Geologists’ Association. 62, 257–268.
Hu, X.-F., Jeans, C.V. and Dickson, J.A.D. 2012. Geochemical and stable isotope patterns of calcite cementation in the Upper Cretaceous Chalk, UK: Direct evidence from calcitefilled vugs in brachiopods. Acta Geologica Polonica, 62, 143–172.
Janetschke, N., Niebuhr, B. and Wilmsen, M. 2015. Inter-regional sequence stratigraphical synthesis of the Plänerkalk, Elbtal and Danubian Cretaceous groups (Germany): Cenomanian–Turonian correlations around the Mid-European Island. Cretaceous Research, 56, 530–549.
Jeans, C.V. 1967. The Cenomanian Rocks of England. Unpublished PhD thesis, 156 pp. University of Cambridge; Cambridge.
Jeans, C.V. 2006. Clay mineralogy of the Cretaceous strata of the British Isles. Clay Minerals, 41, 47–150.
Jeans, C.V., Long, D., Hall, M.A., Bland, D.J. and Cornford, C. 1991. The geochemistry of the Plenus Marls at Dover, England: evidence of fluctuating oceanographic conditions and of glacial control during the development of the Cenomanian–Turonian δ13C anomaly. Geological Magazine, 128, 604–632.
Jeans, C.V., Merriman, R.J., Mitchell, J.G. and Bland. D.J. 1982. Volcanic clays in the Cretaceous of southern England and Northern Ireland. Clay Minerals, 17, 105–156.
Jeans, C.V., Wray, D. S., Williams, T.C., Bland, D.J. and Wood, C.J. 2021. Redox conditions, glacio-eustasy, and the status of the Cenomanian–Turonian Anoxic Event: new evidence from the Upper Cretaceous Chalk of England. Acta Geologica Polonica, 71, 103–152.
Jukes-Browne, A.J. and Hill, W. 1903. The Cretaceous rocks of Britain, Vol. II – The Lower and Middle Chalk of England. Memoir of the Geological Survey, 568 pp. HMSO; London.
Jukes-Browne, A.J. and Hill, W. 1904. The Cretaceous rocks of Britain, Vol. III – The Upper Chalk of England. Memoir of the Geological Survey of Great Britain, 566 pp. HMSO; London.
Lefort, J.-P., Monnier, J.-L. and Danukalova, G. 2019. Transport of Late Pleistocene loess particles by katabatic winds during the lowstands of the English Channel. Journal of the Geological Society of London, 179, 1169–1181.
Lisitzin, A.P. 2002. Sea-ice and iceberg sedimentation in the ocean: recent and past, 564 pp. Springer-Verlag; Berlin and Heidelberg.
Markwick, P.J. and Rowley, D.B. 1998. The geological evidence for Triassic to Pleistocene glaciations: implications for eustacy. In: Pindell, J. and Drake, C.L. (Eds), Palaeogeographic evolution and non-glacial eustacy: northern South America. SEPM Special Publication, 58, 17–43.
Mortimore, R.N., Wood, C.J. and Gallois, R.W. 2001. British Upper Cretaceous Stratigraphy. Geological Conservation Review Series, 23, 558 pp. Joint Nature Conservation Committee; Peterborough.
Osterkamp, T.E. and Gosink, J.P. 1984. Observations and analyses of sediment-laden sea ice. In: Barnes, P.W., Schell, D.M. and Reimnitz, E. (Eds), The Alaskan Beaufort Sea: ecosystems and environments, 73–93 pp. Academic Press; New York.
Price, G.D. 1999. The evidence and implications of polar ice during the Mesozoic. Earth-Science Reviews, 48, 183–210.
Rastall, R.H. 1930. The petrography of the Hunstanton Red Rock . Geological Magazine, 67, 436–458.
Schmidt, K. and Schreyer, E.D. 1973. Erratische Gerölle im Turon (Soester Grünsand) des südöstlichen Münsterlandes (Westfalen). Neues Jahrbuch für Geologie und Paläontologie Monatshefte, 1973, 297–312.
Sollas, W.J. and Jukes-Browne, A.J. 1873. On the included rock-fragments of the Cambridge Upper Greensand. Quarterly Journal of the Geological Society of London, 29, 11–16.
Stebbing, W.P.D. 1897. On two boulders of granite from the Middle Chalk of Betchworth, Surrey. Quarterly Journal of the Geological Society of London, 53, 213–220.
Thomas, G.S.P. and Connell, R.J. 1985. Iceberg drop, dump, and grounding structures from the Pleistocene glacio-lacustrine sediments, Scotland. Journal of Sedimentary Petrology, 55, 243–249.
Torsvik, T.H. and Cocks, L.R.M. 2017. Earth history and palaeogeography, 317 pp. Cambridge University Press; Cambridge.
Whittle, C.H. and Onorato, L. 2000. On the origin of gastroliths determining the weathering environment of rounded and polished stones by scanning-electron-microscope examination. In: Lucas, S.G. and Heckert, A.B. (Eds), Dinosaurs of New Mexico. Bulletin of the New Mexico Museum of Natural History and Science, 17, 69–73.
Wilmsen, M., Niebuhr, B. and Hiss, M. 2005. The Cenomanian of northern Germany: facies analysis of a transgressive biosedimentary system. Facies, 51 (1-4), 242–263.
Wings, O. 2007. A review of gastrolith function with implications for fossil vertebrates and a revised classification. Acta Palaeontologica Polonica, 52, 1–16.
Woolnough,W.G. and David, T.W.E. 1926. Cretaceous glaciation in Central Australia. Quarterly Journal of the Geological Society, London, 82, 332–351.
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Authors and Affiliations

Christopher V. Jeans
1
Ian M. Platten
2

  1. Department of Earth Sciences, University of Cambridge, Downing Place, Cambridge, CB2 3EN, UK
  2. 4 Little Youngs, Welwyn Garden City, Hertfordshire, AL8 6SL, UK
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Abstract

A Middle Campanian (Late Cretaceous) eustatic sea-level rise recorded in the Belgorod succession (Russia; eastern North European Basin) was analyzed. The succession, dated for the Gavelinella annae and Globorotalites emdyensis foraminiferal zones (corresponding to the ‘ Inoceramusazerbaydjanensis–‘ Inoceramusvorhelmensis inoceramid Zone), records the deposition of pure chalk, with only trace terrigenous material. Its distal offshore position limited terrestrial nutrient delivery, driving oligotrophic conditions that influenced benthic foraminifera and organic-walled phytoplankton communities. Eustatic changes are recorded by planktonic foraminifera and additionally reflected in phytoclast abundance, organic-walled dinoflagellate cysts (dinocysts), calcareous dinoflagellate cysts (c-dinocysts), and δ 13C and δ 18O fluctuations. Most indices were primarily driven by variable terrestrial organic matter and freshwater influxes, acting as a function of sea depth and land topography.
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Authors and Affiliations

Michał Fąfara
1
Zofia Dubicka
1
Mariusz Niechwedowicz
1
Agnieszka Ciurej
1
Ireneusz Walaszczyk
2

  1. University of Warsaw, Faculty of Geology, Żwirki i Wigury 93, 02-089 Warszawa, Poland
  2. Department of Geology and Palaeontology, Institute of Biology and Earth Sciences, Pedagogical University of Kraków, Podchorążych 2, 30-084 Kraków, Poland
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Abstract

The assemblage of lacustrine ostracods found in the Eemian Interglacial sediments at Kruklanki (Masurian Lake District, northeastern Poland) contains 18 species belonging to 13 genera. The most dominant species are Candona neglecta Sars, 1887, Limnocytherina sanctipatricii (Brady et Robertson, 1869), Limnocythere inopinala (Baird, 1843) and Candona candida (O.F. Muller, 1776). Cyclocypris serena (Koch, 1838), llyocypris decipiens Masi, 1905, Pseudocandona insculpta (G.W. Muller, 1900) and Leucocythere mirabilis Kaufmann, 1892 are recorded for the first time from the Eemian of Poland; the latter two species are also new for the Eemian lacustrine deposits of Europe. The ecological requirements of the recognised ostracod species as well as their geographic ranges in the Quaternary of Europe are summarised. Based on these data, past habitat type is estimated as a deeper littoral of a lake with reasonably cold, well-oxygenated and calcium-rich waters. The present state of knowledge of the Eemian ostracods from Poland is reviewed and their comparison with the Eemian ostracod assemblages from Europe is briefly given. Comparison of the ostracod fauna! assemblage from Kruklanki with those from other Eemian sites in Poland enables to establish and describe one general type of ostracod assemblages characteristic for lacustrine littoral in this interglacial.
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Authors and Affiliations

Tadeusz Namiotko
Janina Szczechura
Lucyna Namiotko
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Abstract

Lacustrine chalk is very common in post-glacial lakes of northern Poland. In the deposit of Lake Kruk lin (NE Poland) carbonates occur as a layer 2-3 m thick. Samples for laboratory studies were collected from three profiles in SW part of the deposit. Mineral composition of the sediments was determined using differential thermal analysis (DT A) and thermogravimetry analysis (TGA), while the age was determined on the basis of pollen analysis. The sediment profiles represent an age of early Holocene. Calcite is the major component of lacustrine chalk. It forms small crystals (<I O μm), sometimes grouped in aggregates, or present as bioclasts. Calcium carbonate precipitated from lake water. Chemical weathering of glacial and fluvioglacial material of the lake catchment is the main source of ions, transported to the lake mainly by groundwater. Formation of the Kruk lin lacustrine chalk deposit must have required 300-350 kg of dry weight calcium carbonate to be carried away from each square meter of the lake catchment. If only top one-meter layer of glacial sediments had been decalcified, it should have contained 13-22 percent of calcium carbonate. The results of petrographic analysis show this value to be possible.
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Authors and Affiliations

Michał Gąsiorowski
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Abstract

A novel stratigraphical scheme within the Folge Concept is described for the Cenomanian Chalk of England that is particularly suitable for investigating the regional changes in the lithofacies, diagenesis, geochemistry, and mineralogy of the sediments of the Chalk Sea leading up to the Cenomanian–Turonian Oceanic Anoxic Event. It is based on “isochronous” marker bands defined largely by calcitic macrofossil assemblages, and it avoids problems caused by the poor or non-preservation of ammonite assemblages and lateral changes in chalk lithofacies. Eight folgen are based on one, two, or more marker bands. Their sequences, lithologies and calcitic macrofossil assemblages are described from 33 exposures in the Northern Chalk Province of England. The folgen are named, in ascending order, the Belchford, Stenigot, Dalby, Bigby, Candlesby, Nettleton, Louth and Flixton, after villages in Lincolnshire and Yorkshire, England. The folgen are traced throughout the Transitional and Southern Chalk provinces of England. They are present in the Cenomanian chalk of northern Germany and northwest France. Regionally, an individual folge may display considerable vertical and lateral variation in general lithology and lithofacies whilst still maintaining their defining marker bands. The possibility of further refinement to the scheme is discussed.
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Authors and Affiliations

Christopher Vincent Jeans
1

  1. Department of Earth Sciences, University of Cambridge, Downing Place, Cambridge CB2 3EN, UK

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