Stratigraphy of the upper cretaceous white chalk of Sussex

Mortimore, Rory N.

doi:10.1016/s0016-7878(86)80065-7

Cited by 153 publications

(115 citation statements)

References 24 publications

Supporting

Mentioning

115

Contrasting

Order By: Relevance

“…1) Rowe (1900), dips at approximately 15 • to the west. The lithological succession was described by Mortimore (1986Mortimore ( , 1997, and Jenkyns, Gale & Corfield (1994, fig. 14) published a detailed log of the Middle Santonian-Lower Campanian. The locality has been proposed as a Lower/Middle Coniacian substage boundary stratotype (Kauffman, Kennedy & Wood, 1996), and as a potential boundary stratotype section for both the Santonian (Lamolda & Hancock, 1996) and the Campanian (Hancock & Gale, 1996) stages.…”

Section: G Seaford Head East Sussex (Santonian-campanian)mentioning

confidence: 95%

“…1), affords the thickest Cenomanian/Turonian boundary section in the AngloParis Basin (Jefferies, 1962(Jefferies, , 1963Gale et al 1993Gale et al , 2005Paul et al 1999). The macrofossil (Mortimore, 1986;Gale et al 1993Gale et al , 2000Gale et al , 2005 and microfossil (Paul et al 1999;Keller et al 2001) biostratigraphy of the section has been documented in detail, and Paul et al (1999) have published high-resolution (5-10 cm sample spacing) δ 13 C and δ 18 O curves for a 24 m section incorporating the Cenomanian/Turonian boundary. Similar but lower resolution carbon-isotope curves were presented by Leary & Peryt (1991), Gale et al (1993), Jenkyns, Gale & Corfield (1994), Keller et al (2001) and Tsikos et al (2004).…”

Section: H Eastbourne East Sussex (Cenomanian/turonian Boundary Imentioning

confidence: 99%

“…5) that could be correlated throughout the Anglo-Paris Basin and beyond. The Plenus Marl is everywhere underlain by a strongly burrowed erosion surface at the top of the Grey Chalk, the sub-Plenus erosion surface, and is directly overlain by white nodular chalks formerly referred to the Melbourn Rock (Jefferies, 1963;Mortimore, 1986). In expanded basinal successions, such as that at Eastbourne (Fig.…”

Section: A11 Cenomanian/turonian Boundary Eventmentioning

confidence: 99%

“…In recognition of this, Gale (1996) erected the Ballard Cliff Member for the interval of marly weakly nodular chalks that extends from the top of the Plenus Marl to the top of a distinctive succession containing six marls (Fig. 5), Meads Marls 1-6 of Mortimore (1986). The overlying marly chalks of the Holywell Member (Mortimore, 1986) contain a succession of marl seam marker beds, including Holywell Marls 1-7 at the base.…”

Section: A11 Cenomanian/turonian Boundary Eventmentioning

confidence: 99%

“…5), Meads Marls 1-6 of Mortimore (1986). The overlying marly chalks of the Holywell Member (Mortimore, 1986) contain a succession of marl seam marker beds, including Holywell Marls 1-7 at the base. This marker-bed stratigraphy provides a basis for detailed comparison of the study sections (Figs 3,6).…”

Section: A11 Cenomanian/turonian Boundary Eventmentioning

confidence: 99%

See 4 more Smart Citations

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

View full text Add to dashboard Cite

-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...

show abstract

Section: G Seaford Head East Sussex (Santonian-campanian)mentioning

confidence: 95%

Section: H Eastbourne East Sussex (Cenomanian/turonian Boundary Imentioning

confidence: 99%

Section: A11 Cenomanian/turonian Boundary Eventmentioning

confidence: 99%

Section: A11 Cenomanian/turonian Boundary Eventmentioning

confidence: 99%

Section: A11 Cenomanian/turonian Boundary Eventmentioning

confidence: 99%

See 3 more Smart Citations

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

View full text Add to dashboard Cite

show abstract

Astronomical calibration and global correlation of the Santonian (Cretaceous) based on the marine carbon isotope record

et al. 2016

View full text Add to dashboard Cite

High‐resolution records of bulk carbonate carbon isotopes have been generated for the Upper Coniacian to Lower Campanian interval of the sections at Seaford Head (southern England) and Bottaccione (central Italy). An unambiguous stratigraphic correlation is presented for the base and top of the Santonian between the Boreal and Tethyan realms. Orbital forcing of carbon and oxygen isotopes at Seaford Head points to the Boreal Santonian spanning five 405 kyr cycles (Sa1 to Sa5). Correlation of the Seaford Head time scale to that of the Niobrara Formation (Western Interior Basin) permits anchoring these records to the La2011 astronomical solution at the Santonian‐Campanian (Sa/Ca) boundary, which has been recently dated to 84.19 ± 0.38 Ma. Among the five tuning options examined, option 2 places the Sa/Ca at the 84.2 Ma 405 kyr insolation minimum and appears as the most likely. This solution indicates that minima of the 405 kyr filtered output of the resistivity in the Niobrara Formation correlate to 405 kyr insolation minima in the astronomical solution and to maxima in the filtered δ13C of Seaford Head. We suggest that variance in δ13C is driven by climate forcing of the proportions of CaCO3 versus organic carbon burial on land and in oceanic basins. The astronomical calibration generates a 200 kyr mismatch of the Coniacian‐Santonian boundary age between the Boreal Realm in Europe and the Western Interior, due either to diachronism of the lowest occurrence of the inoceramid Cladoceramus undulatoplicatus between the two regions or to remaining uncertainties of radiometric dating and cyclostratigraphic records.

show abstract

Chalk micropalaeontology and the provenancing of middle pleistocene lowestoft formation till in eastern England

Fish

Whiteman

2001

Earth Surf Processes Landf

View full text Add to dashboard Cite

The distribution and deposits of British and Scandinavian Middle Pleistocene ice sheets in eastern England remain problematic. A new till provenancing technique based on Chalk micropalaeontology is described, with the object of refining understanding of the ice sheet which deposited the Lowestoft Formation till (Anglian/Elsterian) and its relationship to Scandinavian ice sheets. The technique involves extracting foraminifera from Chalk erratics and till matrix obtained from stratigraphically controlled till sections and comparing their micropalaeontology with that of Upper Cretaceous Chalk bedrock. Application to the Lowestoft Formation till of eastern England suggests that current models of ice-flow in this region require revision involving reinstatement of some earlier ideas. Chalk provenance data indicate an initial phase of glaciation, with ice streaming southwards across eastern England before fanning across East Anglia from the position of the Fen basin. This was followed by a later phase in which the main southward trajectory of ice-flow was located further east in the North Sea Basin, but again with ice fanning out across East Anglia. These ice-flow trajectories imply constraint of the British ice sheet by Scandinavian ice.

show abstract

Stratigraphy of the upper cretaceous white chalk of Sussex

Cited by 153 publications

References 24 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)

Astronomical calibration and global correlation of the Santonian (Cretaceous) based on the marine carbon isotope record

Chalk micropalaeontology and the provenancing of middle pleistocene lowestoft formation till in eastern England

Contact Info

Product

Resources

About

Stratigraphy of the upper cretaceous white chalk of Sussex

Cited by 153 publications

References 24 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)

Astronomical calibration and global correlation of the Santonian (Cretaceous) based on the marine carbon isotope record

Chalk micropalaeontology and the provenancing of middle pleistocene lowestoft formation till in eastern England

Contact Info

Product

Resources

About

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)