Sedimentation and palaeogeography of the eastern part of the Paris Basin (France) at the Middle-Upper Jurassic boundary

The Middle-Upper Jurassic boundary corresponds to a period of far-reaching changes in sedimentation patterns related to alterations in the palaeo-climate and in the global carbon cycle. Marl deposits were laid down in the east of the Paris Basin at this time and ANDRA has selected these lithological units as the site for an underground study laboratory. The build-up of these marls is the result, among other things, of the area long having been a shelf and of more rapid subsidence from the Early Callovian to the Early Oxfordian. Changes are detected between areas on either side of the Vittel Fault from the onset of the mid-Oxfordian onwards. (authors)