The information on this page is a summary description.
The full formal description is available here: Thivencelles Marls Formation
| Abbreviation | THV |
| Parent unit | Chalk group |
| Child unit | |
| Lithological description | Clayey, soft, “plastic” when wet, swelling when exposed, generally green when fresh, but yellow after alteration at outcrop: these are the “Dièves moyennes” of J. Cornet (1923). The lower part may becoloureddifferently: white, ochre, red (“Dièvesblanches, rouges” from northern France or “Dièves inférieures” of J. Cornet, 1923). The base of the Formation consists of a pebble conglomerate and a black and shiny gravel: this is more or less equivalent with the glauconitic Mons Conglomerate Bed ” Lit du Conglomérat de Mons” (Robaszynski, 1975) or “Tourtia de Mons” auct. (cf. Marlière, 1957). |
| Age | Latest Cenomanian for the Mons Conglomerate Bed in the western part and the white and red marls with Actinocamax plenus, Rotalipora cushmani, Whiteinella archaeocretacea; Early Turonian for the green marls containing Mytiloides labiatus, M. hercynicus, Mammites nodosoides, Helvetoglobotruncana helvetica, Dicarinella hagni. |
| Thickness | A few metres to 20 m. |
| Area of occurrence | In the western part of the Mons Basin and in northern France. |
| Type locality | Saint-Aybert des Mines de Thivencelles Pit, between 266 and 218 m (see Robaszynski, 1975 b, p. 34). |
| Alternative names | |
| Authors | Robaszynski, F., Dhondt, A.V. & Jagt, J.W.M. |
| Date | 01/01/2001 |
| Cite as | Robaszynski, F., Dhondt, A.V. & Jagt, J.W.M., 2001. The Thivencelles Marls Formation, 01/01/2001. National Commission for Stratigraphy Belgium. http://ncs.naturalsciences.be/lithostratigraphy/Thivencelles-Marls-Formation |
