Jurassic palynology from a borehole in the Champagne area, France-correlation of the lower Callovian-middle Oxfordian using sequence stratigraphy

Abstract

The cored borehole A901, drilled by the National Agency for the Management of Radioactive Waste at Montcornet, in Champagne, on the northeastern border of the Paris Basin, provided a continuous section from the Hettangian to the lower Kimmeridgian. Samples taken at regular intervals yielded marker dinoflagellate cysts of the northwest European domain that have been correlated with ammonite zones.The earliest dinoflagellate species appear in the upper Sinemurian (976 m, Obtusum zone), whereas the lowest intersected beds contain abundant conifer pollen and pteridophyte spores. The microplankton becomes diversified along the hole, in particular in the Callovian-Oxfordian beds; the Bathonian gravelly oolitic limestones are unfavourable for preservation of microflora.The sequence-stratigraphical interpretation was based on lithological, sedimentological and biostratigraphical information and seismic profiles. A semi-quantitative estimation of the microplankton content and of the number of species per sample enabled identification of the main transgressive-regressive cycles and condensed sequences in the lower Callovian to middle Oxfordian.

Mineralogical and isotopic record of biotic and abiotic diagenesis of the Callovian–Oxfordian clayey formation of Bure (France)

“…Detrital organic matter in claystone samples do not exceed $1.4 wt.% (Disnar et al, 1996;Cassagnabère, 2001;Claret et al, 2004;Gaucher et al, 2004). Chemical studies showed that terrestrial organic matter is ubiquitous in the clay formation, whereas marine-derived organic matter is mostly observed at the Callovian-Oxfordian transition corresponding to the MCZ (Fauconnier, 1995;Disnar et al, 1996;Michels, 2001;Hautevelle et al, 2007).…”

Spatial Distribution of Algal Assemblages in a Temperate Lowland Peat Bog

“…-for references see e.g., ŠEJNOHOVÁ et al, 2003). Semiquantitative estimates of algal populations were deduced from slides, and individual species were classified into three categories: (1) up to 1% of individuals revealed, (2) up to 50% of individuals, and (3) more than 50% of individuals of a particular assemblage (KINROSS et al, 1993;FAUCONNIER, 1995;GAISER and JOHANSEN, 2000;HUSA et al, 2004;KOMÁREK and SUKAČOVÁ, 2004). Approximately 500 cells per sample were observed.…”

Répartition stratigraphique et biozones des kystes de dinoflagellés au passage Jurassique moyen–Jurassique supérieur (Bathonien supérieur–Oxfordien inférieur) dans le Bassin de Guercif, Maroc nord-oriental

“…France, Fauconnier, 1995, Barski 1999, 2012, Huault, 1999, Williams & Bujak 1985 La plupart des études concernant le domaine sub-boréal sont corrélées avec les zones d'Ammonites. En Angleterre les biozones des kystes des dinoflagellés, couvrent tout le jurassique, et, ont été bien corrélées avec les zones standard d'ammonites (Cope et al, 1980a, 1980b, In: Woollam et Riding, 1983Riding et Thomas, 1992 (Woollam et Riding, 1983).…”

“…Ctenidodinium sellwoodii caractérise dans l'ensemble des bassins de l'Europe du Nord-Ouest, une biozone à Cse correspondante au Bathonien moyen-Callovien inférieur (Riding et Thomas, 1992). Sarjeant (1979) (Huault,1999) ou la région de Champagne (Fauconnier, 1995) (Fauconnier, 1995, Huault,1999.…”

“…Ctenidodinium cornigerum (Valensi, 1953) Jan du chêne et al 1985, est limité au Bathonien en Angleterre (Riding & Thomas, 1992, mais en France (Fauconnier, 1995, Huault, 1999, comme pour le Portugal (Borges & al 2011) et le Maroc (Hssaida, 1990), elle dépasse le Bathonien et se trouve dans le Callovien inférieur.…”