Nouvelles données biostratigraphiques sur la limite Cénomanien-Turonien. La coupe de Cassis (Sud-Est de la France): proposition d'un hypostratotype européen

Jolet, Patrick; Philip, Jean; Thomel, Gérard; López, Gregorio; Tronchetti, Guy

doi:10.1016/s1251-8050(97)89114-8

Cited by 4 publications

(7 citation statements)

References 5 publications

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“…Above another exposure gap, the main part of the section is continuously accessible (55.8‒236.0 m) and consists of homogenous marls with intercalated bundles of nodular limestone together representing basinal facies. Existing ammonite data combined with new biostratigraphic results constrain this section to the Upper Cenomanian–Lower Turonian 22 (Supplementary Note 1 ). This age assignment is further corroborated and refined by carbon isotope data, which show a characteristic positive CIE revealing an initial high-amplitude positive peak (a) followed by a trough interval, which gives way to a plateau with two consecutive peaks (b, c) (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Stratigraphic positions of the Plenus Cold Event (PCE) according to (1) 53 , (2) 70 , (3) 13 with (4) representing supposed PCE position at Cassis. Color-code of the Cassis carbon-isotope record corresponds to lithostratigraphic formations 22 , 28 with blue = Grès de l’Anse Sainte Magdeleine Fm., orange = Calcaires du Corton Fm., black = Marnes de l’Anse de l’Arène Fm. Carbon-isotope stratigraphic trend of plant-derived leaf-wax n -alkanes ( n -C 25 ; n -C 27 ) is restricted to the Marnes de l’Anse de l’Arène Fm.…”

Section: Resultsmentioning

confidence: 99%

“…1 ) and has been analyzed for biostratigraphy, palynology, TEX 86 and stable carbon isotopic composition of carbonates and organic materials. Stratigraphic assignment of the section is based on existing ammonite data 22 combined with new information from planktonic foraminifera, calcareous nannoplankton, and carbon isotopes of bulk carbonate, organic matter and plant wax-derived long-chain n -alkanes.

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Section: Introductionmentioning

confidence: 99%

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Vegetation response to exceptional global warmth during Oceanic Anoxic Event 2

et al. 2018

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The Cenomanian–Turonian Oceanic Anoxic Event (OAE2; ~94.5 million years ago) represents an episode of global-scale marine anoxia and biotic turnover, which corresponds to one of the warmest time intervals in the Phanerozoic. Despite its global significance, information on continental ecosystem response to this greenhouse episode is lacking. Here we present a terrestrial palynological record combined with marine-derived temperature data (TEX86) across an expanded OAE2 section from the Southern Provençal Basin, France. Despite high TEX86-derived temperature estimates reaching up to 38 °C, the continental hinterland did support a diverse vegetation, adapted to persist under elevated temperatures. A transient phase of climatic instability and cooling during OAE2 known as Plenus Cold Event (PCE) is marked by the proliferation of open, savanna-type vegetation rich in angiosperms at the expanse of conifer-dominated forest ecosystems. A rise in early representatives of Normapolles-type pollen during the PCE marks the initial radiation of this important angiosperm group.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Fig.…”

Section: Introductionmentioning

confidence: 99%

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Vegetation response to exceptional global warmth during Oceanic Anoxic Event 2

et al. 2018

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“…The sedimentary succession at Cassis (southeast France) has been well-calibrated by ammonoid 55 , planktonic foraminifera, and nannofossil biostratigraphy 56 , and δ 13 C org chemostratigraphy 35 . The palynological data of the Cassis section provides the first complete assessment of plant responses during the OAE 2 35 .…”

Section: Introductionmentioning

confidence: 99%

“…Simplified Late Cretaceous palaeogeographical map, location map and the studied stratigraphic section (A-B). Figures modified after55,58 , respectively.…”

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confidence: 99%

The Cenomanian/Turonian boundary in light of new developments in terrestrial palynology

Galasso

Heimhofer

Schneebeli‐Hermann

2022

Preprint

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The Cenomanian/Turonian boundary interval is associated with an oceanic anoxic event (OAE 2, 94.0 Ma) during one of the warmest episodes in the Mesozoic. To date, plant responses to these climatic conditions are known only from the northernmid-latitudinal succession in Cassis, France. There, conifer-dominated and angiosperm-dominated vegetation types alternate.However, whether the exceptional environmental conditions had an impact on plant reproduction is unknown to date. Weapplied a new environmental proxy based on spore and pollen teratology on palynological samples from the Cassis succession,to explore if this phenomenon also occurs across the OAE 2. The observed frequencies of <1% malformed spores and pollengrains suggest that plant reproduction was not affected during the Cenomanian/Turonian boundary interval.

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The Cenomanian/Turonian boundary in light of new developments in terrestrial palynology

Galasso

Heimhofer

Schneebeli‐Hermann

2023

Sci Rep

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The Cenomanian/Turonian boundary interval is associated with an oceanic anoxic event (OAE 2, 94.0 Ma) during one of the warmest episodes in the Mesozoic. To date, plant responses to these climatic conditions are known only from the northern mid-latitudinal succession in Cassis, France. There, conifer-dominated and angiosperm-dominated vegetation types alternate. However, whether the exceptional environmental conditions had an impact on plant reproduction is unknown to date. We applied a new environmental proxy based on spore and pollen teratology on palynological samples from the Cassis succession, to explore if this phenomenon also occurs across the OAE 2. The observed frequencies of<1% malformed spores and pollen grains suggest that plant reproduction was not affected during the Cenomanian/Turonian boundary interval. While the effects of continental Large Igneous Province(s) on plant reproduction have shown to produce abnormal spore or pollen morphologies as evidence for severe environmental pollution, by contrast the effects of oceanic LIP(s) seems to be inconsequential.

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Nouvelles données biostratigraphiques sur la limite Cénomanien-Turonien. La coupe de Cassis (Sud-Est de la France): proposition d'un hypostratotype européen

Cited by 4 publications

References 5 publications

Vegetation response to exceptional global warmth during Oceanic Anoxic Event 2

Vegetation response to exceptional global warmth during Oceanic Anoxic Event 2

The Cenomanian/Turonian boundary in light of new developments in terrestrial palynology

The Cenomanian/Turonian boundary in light of new developments in terrestrial palynology

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