[7] The view and reconstruction of the sedimentary basins on the Toarcian realm is very complicated, since they lost their original geometry due to tectonic works and deformations on the Noegene, abundant allochthonous material and several hiatus on the strata.

The lowermost part of the strata recovers spotted limestone beds & alternations of dark Marls that are equivalent to the uppermost Allgäu Formation.

[4] Geochemical, palynological and mineralogical framboid data show that dysoxic to euxinic conditions occurred in an epicontinental basin located close to the Tethys open-ocean during the T-OAE, and continued after it.

[4] The basin was located between Oravicum, with an initial area of ~100,000 square kilometers, and the NW-European shelf and has been associated with considerable amounts of sulfur and carbon during the T-OAE.

[4] The presence of brown wood traces has been interpreted as reflecting the proximity of land areas, with fluvial run-off supplying fresh phytoclasts.

Although most of the basin lacks unequivocal palynological evidence for brackish conditions, such as the freshwater green algae Botryococcus, being related to effects due to changes in oxygenation.