‘Lithostratigraphy for mapping the Chalk of southern England’ by Bristow et al. (1997): discussion

Gale, Andy; Hancock, Jake M.; Bristow, Roger; Mortimore, Rory N.; Wood, Christopher J.

doi:10.1016/s0016-7878(99)80007-8

Cited by 11 publications

(3 citation statements)

References 15 publications

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“…Gale, Wood & Bromley, 1987;Gale et al 1999a;Robinson, 1987;Mortimore, 1988;Bristow, 1999;Rawson, Allen & Gale, 2001;Peake, 2002;Woods et al 2002). Here, the traditional member subdivisions of the Cenomanian (Gale et al 1999a) are used, whereas the terminology of Gale (1996) is employed for the Turonian, and that of Gale, Wood & Bromley (1987) for the Coniacian-Campanian. This member terminology has been plotted against the lithostratigraphic logs of the Culver section for reference purposes.…”

Section: Study Sections 2a Stratigraphic Frameworkmentioning

confidence: 99%

Secular variation in Late Cretaceous carbon isotopes: a new δ¹³C carbonate reference curve for the Cenomanian–Campanian (99.6–70.6 Ma)

et al. 2006

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-Carbon stable-isotope variation through the Cenomanian-Santonian stages is characterized using data for 1769 bulk pelagic carbonate samples collected from seven Chalk successions in England. The sections show consistent stratigraphic trends and δ 13 C values that provide a basis for highresolution correlation. Positive and negative δ 13 C excursions and inflection points on the isotope profiles are used to define 72 isotope events. Key markers are provided by positive δ 13 C excursions of up to + 2 ‰: the Albian/Cenomanian Boundary Event; Mid-Cenomanian Event I; the Cenomanian/Turonian Boundary Event; the Bridgewick, Hitch Wood and Navigation events of Late Turonian age; and the Santonian/Campanian Boundary Event. Isotope events are isochronous within a framework provided by macrofossil datum levels and bentonite horizons. An age-calibrated composite δ 13 C reference curve and an isotope event stratigraphy are constructed using data from the English Chalk. The isotope stratigraphy is applied to successions in Germany, France, Spain and Italy. Correlation with pelagic sections at Gubbio, central Italy, demonstrates general agreement between biostratigraphic and chemostratigraphic criteria in the Cenomanian-Turonian stages, confirming established relationships between Tethyan planktonic foraminiferal and Boreal macrofossil biozonations. Correlation of the Coniacian-Santonian stages is less clear cut: magnetostratigraphic evidence for placing the base of Chron 33r near the base of the Upper Santonian is in good agreement with the carbon-isotope correlation, but generates significant anomalies regarding the placement of the Santonian and Campanian stage boundaries with respect to Tethyan planktonic foraminiferal and nannofossil zones. Isotope stratigraphy offers a more reliable criterion for detailed correlation of Cenomanian-Santonian strata than biostratigraphy. With the addition of Campanian δ 13 C data from one of the English sections, a composite Cenomanian-Campanian age-calibrated reference curve is presented that can be utilized in future chemostratigraphic studies.The Cenomanian-Campanian carbon-isotope curve is remarkably similar in shape to supposedly eustatic sea-level curves: increasing δ 13 C values accompanying sea-level rise associated with transgression, and falling δ 13 C values characterizing sea-level fall and regression. The correlation between carbon isotopes and sea-level is explained by variations in epicontinental sea area affecting organic-matter burial fluxes: increasing shallow sea-floor area and increased accommodation space accompanying sea-level rise allowed more efficient burial of marine organic matter, with the preferential removal of 12 C from the marine carbon reservoir. During sea-level fall, reduced seafloor area, marine erosion of previously deposited sediments, and exposure of basin margins led to reduced organiccarbon burial fluxes and oxidation of previously deposited organic matter, causing falling δ 13 C values. Additionally, drowning of carbonate platforms during...

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Section: Study Sections 2a Stratigraphic Frameworkmentioning

confidence: 99%

Secular variation in Late Cretaceous carbon isotopes: a new δ¹³C carbonate reference curve for the Cenomanian–Campanian (99.6–70.6 Ma)

et al. 2006

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“…4). These changes did not find full favour with some Chalk stratigraphers (Gale and Hancock 1999;Bristow et al 1999).…”

Section: History Of the Currently Used Formational Schemementioning

confidence: 83%

A marker band folgen stratigraphy for the Cenomanian Chalk of England and its extension to northen Germany and France

Jeans

2023

Acta Geologica Polonica

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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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“…BGS got in on the act when they realised that there was a demand for maps of southern England showing engineers how hard the chalk is, and they cobbled together a composite stratigraphical scheme using names they had coined whilst mapping Dorset, and those created by Mortimore in Sussex. A major criticism of this GCR book is that it applies the BGS scheme uncritically to all the English conservation sites (see comments in Gale & Hancock, 1999). After a general introduction, there follows a 54-page account of the biostratigraphy of the English Chalk which includes a number of spectacular fossil misidentifications.…”

mentioning

confidence: 99%

WORDEN, R. H. & MORAD, S. (eds) 2002. Clay Mineral Cements in Sandstones. International Association of Sedimentologists Special Publication no. 34. viii + 509 pp. Oxford: Blackwell Science. Price £75.00 (paperback). ISBN 1 40510 587 9

Jeans¹

2004

Geol. Mag.

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‘Lithostratigraphy for mapping the Chalk of southern England’ by Bristow et al. (1997): discussion

Cited by 11 publications

References 15 publications

Secular variation in Late Cretaceous carbon isotopes: a new δ¹³C carbonate reference curve for the Cenomanian–Campanian (99.6–70.6 Ma)

Secular variation in Late Cretaceous carbon isotopes: a new δ¹³C carbonate reference curve for the Cenomanian–Campanian (99.6–70.6 Ma)

A marker band folgen stratigraphy for the Cenomanian Chalk of England and its extension to northen Germany and France

WORDEN, R. H. & MORAD, S. (eds) 2002. Clay Mineral Cements in Sandstones. International Association of Sedimentologists Special Publication no. 34. viii + 509 pp. Oxford: Blackwell Science. Price £75.00 (paperback). ISBN 1 40510 587 9

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‘Lithostratigraphy for mapping the Chalk of southern England’ by Bristow et al. (1997): discussion

Cited by 11 publications

References 15 publications

Secular variation in Late Cretaceous carbon isotopes: a new δ13C carbonate reference curve for the Cenomanian–Campanian (99.6–70.6 Ma)

Secular variation in Late Cretaceous carbon isotopes: a new δ13C carbonate reference curve for the Cenomanian–Campanian (99.6–70.6 Ma)

A marker band folgen stratigraphy for the Cenomanian Chalk of England and its extension to northen Germany and France

WORDEN, R. H. & MORAD, S. (eds) 2002. Clay Mineral Cements in Sandstones. International Association of Sedimentologists Special Publication no. 34. viii + 509 pp. Oxford: Blackwell Science. Price £75.00 (paperback). ISBN 1 40510 587 9

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Product

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Secular variation in Late Cretaceous carbon isotopes: a new δ¹³C carbonate reference curve for the Cenomanian–Campanian (99.6–70.6 Ma)

Secular variation in Late Cretaceous carbon isotopes: a new δ¹³C carbonate reference curve for the Cenomanian–Campanian (99.6–70.6 Ma)