Late Cretaceous palaeoenvironments expressed by the clay mineralogy of Cenomanian–Campanian chalks from the east of the Paris Basin

The Middle Callovian to Middle Oxfordian clay deposits drilled in the eastern Paris Basin (borehole HTM 102, ANDRA) show a strong mineralogical change occurring in the lowermost Oxfordian (Scarburgense subzone, Mariae zone). Such a change probably results from the initial development of connections between the young Atlantic Ocean and the Paris Basin. A bentonitic layer identified close to the boundary between Lower and Middle Oxfordian and also recognized in the subalpine Basin (South-East of France) at the same age, reflects a volcanic activity probably resulting from an extensional regime located in the North Sea.

Contrôle géodynamique de la sédimentation argileuse du Callovien-Oxfordien moyen dans l'Est du bassin de Paris: influence eustatique et volcanique

Contrôle géodynamique de la sédimentation argileuse du callovien-oxfordien moyen dans l'est du bassin de Paris

The potential of the Lengerich section (Münster Basin, northern Germany) as a possible candidate Global boundary Stratotype Section and Point (GSSP) for the Middle/Upper Turonian boundary

The Mid-Cenomanian Event in southeastern France: Evidence from palaeontological and clay mineralogical data

The clay assemblages of marly levels identified in Upper Turonian chalks in the Boulonnais and Normandy are composed almost entirely of magnesium-rich dioctahedral smectite resulting from submarine alteration of volcanic glass shards. Like hardgrounds, these levels constitute stratigraphic markers in the North of France

Niveaux reperes de bentonite d'origine volcanique dans les craies du turonien du boulonnais et de haute-normandie

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Niveaux reperes de bentonite d'origine volcanique dans les craies du turonien du boulonnais et de haute-normandie