{"refrec":{"BRefID":219245,"RR":"<b>Felder, P.J.S.</b> (1994). Bioklasten in het krijt uit boringen van West-en Oost-Vlaanderen. <i>Professional Paper. Geological Survey of Belgium</i>, 1994/03(270). Geologische Dienst van België: Brussel.  86 pp., 32 figs., 40 tab., 1 pl. pp.","BEntID":210984,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":null,"RefStringPartII":". <i>Professional Paper. Geological Survey of Belgium</i>, 1994/03(270). Geologische Dienst van België: Brussel.  86 pp., 32 figs., 40 tab., 1 pl. pp.","DocTypID":5,"DocType":"Book/Monograph","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Felder, P.J.S.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Felder, P.J.S.","Englishabstract":"During recent years nearly 500 samples from boreholes drilled in West Flanders have been analyzed (figs 1-3). These samples appeared to contain sufficient amounts of bioclasts (1-2.4 mm) to allow a subdivision into ecozones, which formed the basis of a lithostratigraphic subdivision (fig. 4). The bioclast assemblages indicate that these boreholes are situated outside the depositional area of the Campine-Limburg basin (Maastricht-Hasselt-Antwerp). That is the reason why Arabic numerals have been used in the ecozonation, in distinction with the ecozonation of the Campine-Limburg basin (Roman numerals, fig.5). In the boreholes examined Cretaceous rests directly either on Cambro-Silurian of the Brabant Massif or on the Devono-Carboniferous of the Tournai Basin (Namur Synclinorium), north of the Bordière Fault. A limited number of samples from the Mons basin (Fig.6) appear to indicate that the West Flanders samples are more closely correspond with strata of that basin. The Nevele and Dendermonde boreholes (East Flanders) cannot directly be tied in with the ecozones. The Nevele samples may belong to ecozones 4 and 5. The Dendermonde borehole is characterized by a different bioclast assemblage and thus cannot be correlated with boreholes.Bioclast cannot be used for age determination of strata, which is why other methods are necessary. In the present case we have relied on the studies carried out by F. Robaszynski 1989 and S. Louwye 1993. ","AbstractOtherLang":"Gedurende de laatste jaren werden uit het Krijt bijna 500 monsters uit boringen van West Vlaanderen onderzocht (fig.1,2en3). De monsters bleken voldoende bioklasten 1-2.4 mm te bevatten om een indeling in ecozones mogelijk te maken, die de basis kan vormen voor een lithostratigrafische onderverdeling (fig.4). De bioklasten-samenstelling wijst er op dat de boringen buiten het sedimentatie-gebied van het Kempens-Limburgse bekken (Maastricht-Hasselt-Antwerpen) liggen. Daarom werden bij de ecozone-indeling Arabische cijfers gebruikt in afwijking met de ecozone-indeling in het Kempens-Limburgse bekken (Romeinse cijfers, fig.5). In de bestudeerde boringen rust het Krijt op het Cambro-Siluur van het Massief van Brabant of op het Devoon-Carboon van het bekken van Doornik (Synclinorium van Namen, ten noorden van de Faille Bordière). Een gering aantal onderzochte monsters uit het bekken van Bergen (fig.6) wijzen in de richting dat de monsters uit het zuiden van West Vlaanderen meer overeenstemmen met de afzettingen uit het bekken van bergen. De boringen te Nevele en Dendermonde (Oost Vlaanderen) kunnen niet zonder meer ingepast worden in de ecozones. Misschien dat de monsters uit de boring te Nevele thuishoren in de ecozones 4 en 5. De boring te dendermonde heeft een afwijkende bioklasten-samenstelling kan derhalve niet gecorreleerd worden met andere boringen.Met behulp van de bioklasten kan men de ouderdom van de lagen niet vaststellen, hiertoe heeft men de hulp nodig van een andere methode. In dit geval wordt gesteund op het onderzoek uitgevoerd door F. Robaszynski 1989 en S. 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