Updating Frasnian miospore zonation from the Boulonnais (Northern France) and comparison with new data from the Upper Palaeozoic cover on the Brabant Massif (Western Belgium)

Accurate palyno-analysis by S. Loboziak (from 1980 to 1983) of 28 samples from the Upper Givetian Middle Frasnian Blacourt, Beaulieu and Ferques Formations 44 Lower Famennian Hydrequent Formation are re-evaluated. Chelinospora concinna, Verrucosisporites bulliferus, Cirratriradites jekhowskyi, Lophozonotriletes media first occurrences major criteria for Frasnian, well calibrated conodonts. Cymbosporites acanthaceus, Rugospora bricei, Grandispora gracilis, Diducites plicabilis, Corbulispora vimineus allow subdivide where conodonts poorly present. Samarisporites triangulatus versus Auroraspora pseudocrista taxonomy stratigraphic significance discussed. The reconnaissance borehole Nieuwkerke-De Seule (95W152), near limit Palaeozoic subcrop on Brabant Massif (West Flanders, Belgium, 75 km east Boulonnais), which has intersected conodont-dated Givetian/Frasnian boundary at transition between Bois de Bordeaux Bovesse Formations, contained preserved miospores attributed triangulatus–concinna (TCo) Oppel Zones. In nearby Nieuwkerke-Noordhoek (95W153), strata also assigned yielded better demonstrate a close succession bulliferus–jekhowskyi (BJ) Zones Lower–Middle known in Boulonnais. Samples Heuvelland groundwater monitoring (95W175), 10 north Nieuwkerke, contain bricei-acanthaceus (BA) Zone suggesting late age, Boulonnais area Booischot (59E146) Campine Basin (Belgium). International correlation using miospore zonation is attempted Pripyat Depression Belarus, Timan–Pechora province Russia North-West China.