1 1 Proposal Lithostratigraphy Ieper Group 06/2016 2 3 An update of the lithostratigraphy of the Ieper 4 Group. 5 6 Etienne Steurbaut, Marleen De Ceukelaire, Tim Lanckacker, Johan Matthijs, 7 Peter Stassen, Hervé Van Baelen, Noël Vandenberghe 8 9 To refer to the present document in publications use the following reference : 10 Steurbaut, E. , De Ceukelaire,M., Lanckacker T., Matthijs, J., Stassen, P., Van Baelen H., 11 Vandenberghe, N., 2016. Lithostratigraphy Ieper Group. 12 http://ncs.naturalsciences.be/Paleogene‐Neogene/proposals‐and‐discussions. 13 14 15 Table of Contents 16 17 An update of the lithostratigraphy of the Ieper Group. ............................................................ 1 18 Introduction ............................................................................................................................... 7 19 Context of the review. ............................................................................................................ 8 20 The use of geophysical well logs and a compendium of reference logs. ............................... 9 21 Relationship between lithostratigraphy and bio‐chronostratigraphy. ................................ 10 22 IEPER GROUP ............................................................................................................................ 11 23 Authors: ................................................................................................................................ 11 24 Description: .......................................................................................................................... 12 25 Age: ....................................................................................................................................... 12 26 Regional distribution: ........................................................................................................... 12 27 Stratotype ............................................................................................................................. 13 28 Subdivisions ......................................................................................................................... 13 29 Kortrijk Formation .................................................................................................................... 15 Version juin 2016 2 30 Authors ................................................................................................................................. 15 31 Description ........................................................................................................................... 15 32 Stratotype ............................................................................................................................. 15 33 Area ...................................................................................................................................... 16 34 Thickness .............................................................................................................................. 16 35 Members .............................................................................................................................. 16 36 Age ........................................................................................................................................ 16 37 Remarks ................................................................................................................................ 16 38 Het Zoute Member ................................................................................................................... 16 39 Authors ................................................................................................................................. 16 40 Description ........................................................................................................................... 16 41 Regional occurrence and previous name: ............................................................................ 17 42 The volcanic ash: .................................................................................................................. 17 43 Stratotype ............................................................................................................................. 17 44 Mont‐Héribu Member .............................................................................................................. 17 45 Authors ................................................................................................................................. 17 46 Description ........................................................................................................................... 17 47 Regional occurrence and previous names: .......................................................................... 18 48 Stratotype ............................................................................................................................. 19 49 Orchies Member ....................................................................................................................... 19 50 Authors ................................................................................................................................. 19 51 Description ........................................................................................................................... 19 52 Regional occurrence and previous names: .......................................................................... 20 53 Stratotype ............................................................................................................................. 21 54 Geophysical borehole references and Subdivisions of the Orchies Member ...................... 21 55 Roubaix Member ...................................................................................................................... 23 56 Authors ................................................................................................................................. 23 57 Description ........................................................................................................................... 23 58 Regional occurrence and previous names: .......................................................................... 24 59 Stratotype ............................................................................................................................. 24 60 Geophysical borehole references ........................................................................................ 25 61 Aalbeke Member ...................................................................................................................... 25 Version juin 2016 3 62 Authors ................................................................................................................................. 25 63 Description ........................................................................................................................... 25 64 Regional occurrence and previous names ........................................................................... 26 65 Stratotype ............................................................................................................................. 26 66 Geophysical borehole references ........................................................................................ 27 67 ‘pink silt’ bed ............................................................................................................................ 27 68 Mons‐en‐Pévèle Formation ...................................................................................................... 27 69 Authors ................................................................................................................................. 27 70 On the Formation status: ..................................................................................................... 27 71 Description : ......................................................................................................................... 28 72 Regional occurrence and previous names: .......................................................................... 28 73 Lithological trends and paleogeography: ............................................................................. 29 74 Stratotype ............................................................................................................................. 30 75 Geophysical borehole references ........................................................................................ 31 76 Tielt Formation ......................................................................................................................... 31 77 On the position of the Egem Member ................................................................................. 31 78 Tielt Formation ......................................................................................................................... 31 79 Authors ................................................................................................................................. 31 80 Description ........................................................................................................................... 31 81 Stratotype ............................................................................................................................. 32 82 Area .....................................................................................................................................