Dinocyst stratigraphy and palaeoenvironmental interpretation of the Cretaceous/Paleogene boundary at Stevns Klint, Denmark

FitzPatrick, Meriel; Forber, David A.; Hart, Malcolm B.

doi:10.1016/j.cretres.2017.09.001

Cited by 9 publications

(2 citation statements)

References 47 publications

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“…In the Brazos River area, and in the Stevns Klint succession there is no evidence of a total productivity collapse (= Strangelove Ocean model), unless it was of such short duration as to be undetected. Dinocyst productivity appears to continue across the K/Pg boundary in a number of locations (Molina et al, 2006;Prauss, 2009;FitzPatrick et al, 2013FitzPatrick et al, , 2018Tuba Aydin, pers. comm., 2013).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Global bioevents and the Cretaceous/Paleogene boundary in Texas and Alabama: Stratigraphy, correlation and ocean acidification

Hart

Leighton

Hampton³

et al. 2019

Global and Planetary Change

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With increasing levels of atmospheric pCO 2 the oceans are becoming progressively more acidic, with the impact of a lowered pH beginning to affect the calcification of numerous invertebrate groups, including foraminifers, pteropods, heteropods and calcareous nannoplankton. Research on the ecology of foraminifera in the Mediterranean Sea, Gulf of California, Caribbean Sea and elsewhere has shown how modern assemblages are responding to acidification. Experimental work in mesocosms and laboratory cultures are also adding to our knowledge of the response to pH changes. Near Ischia (Italy), natural CO 2 vents amongst sea grass meadows are creating low pH environments in which it is possible to observe the response of benthic foraminifera. At a pH of 7.8 the foraminiferal assemblages are already becoming less diverse and below pH 7.6 there are often no calcite-secreting benthic foraminifera. In the Gulf of California, in a deeper-water setting, natural CO 2 (and methane) vents are also lowering sea floor pH. The foraminifera show the impact of this change, although the relatively high carbonate saturation ensures that calcite-secreting foraminifers are able to live and reproduce in these relatively low pH environments, only becoming impacted by dissolution effects once dead. Using data from the Cretaceous-Paleogene boundary in Texas, Alabama and northwest Europe it is clear that the plankton was severely impacted by surface water acidification

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Section: Accepted Manuscriptmentioning

confidence: 99%

Global bioevents and the Cretaceous/Paleogene boundary in Texas and Alabama: Stratigraphy, correlation and ocean acidification

Hart

Leighton

Hampton³

et al. 2019

Global and Planetary Change

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“…(Rasmussen et al, 2005) argued that the Fiskeler Member corresponds to the lowermost Paleocene planktic foraminiferal Zone P0. The dinoflagellate studies of (Brinkhuis et al, 1998) and (FitzPatrick et al, 2017) demonstrated that the Fiskeler Member is characterized by the first occurrences of the marker taxa Senoniasphaera inornata and Carpatella cf. cornuta, similar to the boundary clay layer of the K-Pg boundary GSSP at El Kef (Tunisia), comfirming the assignment of Zone P0 to the Fiskeler Member When the Fiskeler Member is considered as representing planktic foraminiferal Zone P0 of (Olsson et al, 1999), this biozone attains a thickness of around 27-28 cm at the Kulstirenden A outcrop of Stevns Klint.…”

Section: Age Modelmentioning

confidence: 99%

Shelf hypoxia in response to global warming after the Cretaceous-Paleogene boundary impact

Vellekoop

Woelders

Helmond

et al. 2018

Geology

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A fossiliferous spherule-rich bed at the Cretaceous–Paleogene (K–Pg) boundary in Mississippi, USA: Implications for the K–Pg mass extinction event in the Mississippi Embayment and Eastern Gulf Coastal Plain

Witts

Landman

Garb

et al. 2018

Cretaceous Research

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We describe an outcrop of the Cretaceous-Paleogene (K-Pg) boundary exposed due to construction near New Albany, Union County, Mississippi. It consists of the Owl Creek Formation and overlying Clayton Formation. The Owl Creek Formation is rich in the ammonites Discoscaphites iris and Eubaculites carinatus, which, along with biostratigraphically important dinoflagellate cysts and calcareous nannofossils, indicate deposition occurred within the last 1 million years, most likely last 500 kyrs, of the Cretaceous. The base of the overlying Clayton Formation marks the K-Pg boundary, and consists of a 15-30 cm thick muddy, poorly sorted quartz sand containing abundant spherules representing ejecta derived from the Chicxulub impact event. Impact spherules range in size from 0.5 mm to 1 mm in diameter and are hollow and well preserved, with details such as smaller vesicular spherules enclosed within. The spherules are altered to clay minerals such as smectite and are typical of those found at K-Pg boundary sites in the Gulf of Mexico and beyond. Spherules are scattered throughout the bed, and surface counts suggest an average of 4 spherules per cm 2 . Macrofossils within the spherule bed represent a rich fauna of ammonites, benthic molluscs (bivalves and gastropods), echinoids, as well as crabs and sharks. Macrofossil preservation ranges from whole to fragmentary, with most fossils preserved as internal moulds. The infill of the fossils is lithologically identical to the matrix of the spherule bed, including impact ejecta preserved within phragmocones and body chambers of ammonites, and differs from the underlying Owl Creek Formation. This suggests that the animals were either alive or loosely scattered on the sea floor at the time of deposition. Grain size changes indicate multiple events were responsible for deposition, and together with taphonomic evidence are consistent with dynamic high energy post-impact processes. Later sea level change during the Paleocene is responsible for a sharp contact at the top of the spherule bed. Geochemical evidence from the Owl Creek and Clayton Formations at this locality indicate numerous local paleoenvironmental changes affected the Mississippi Embayment at the time of the K-Pg boundary and mass extinction event.

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Dinocyst stratigraphy and palaeoenvironmental interpretation of the Cretaceous/Paleogene boundary at Stevns Klint, Denmark

Cited by 9 publications

References 47 publications

Global bioevents and the Cretaceous/Paleogene boundary in Texas and Alabama: Stratigraphy, correlation and ocean acidification

Global bioevents and the Cretaceous/Paleogene boundary in Texas and Alabama: Stratigraphy, correlation and ocean acidification

Shelf hypoxia in response to global warming after the Cretaceous-Paleogene boundary impact

A fossiliferous spherule-rich bed at the Cretaceous–Paleogene (K–Pg) boundary in Mississippi, USA: Implications for the K–Pg mass extinction event in the Mississippi Embayment and Eastern Gulf Coastal Plain

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