Netherlands Journal of Geosciences — Geologie en Mijnbouw | 89 – 2 | 147 - 167 | 2010 The youngest Maastrichtian ‘true’ inoceramids from the Vijlen Member (Gulpen Formation) in northeast Belgium and the Aachen area (Germany) I. Walaszczyk1,*, J.W.M. Jagt2 & N. Keutgen2,3 1 Uniwersytet Warszawski, Wydział Geologii, Instytut Geologii Podstawowej, Al. Żwirki i Wigury 93, PL-02 089 Warszawa, Poland. 2 Natuurhistorisch Museum Maastricht, de Bosquetplein 6-7, NL-6211 KJ Maastricht, the Netherlands. 3 Present address: UTP Bydgoszczy, ul. Bernardyńska 6/8, PL-85 029 Bydgoszcz, Poland. * Corresponding author. Email:
[email protected] Manuscript received: October 2009; accepted July 2010 Abstract The youngest representatives of ‘true’ (= non-tegulated) inoceramid bivalves (Inoceramidae) are described from intervals 3-6 of the Vijlen Member (Gulpen Formation), of late early and early late Maastrichtian age, as exposed at quarries and temporary sections in northeast Belgium (CPL SA- Haccourt and CBR-Lixhe quarries) and the Aachen area (Germany), i.e. the extended type area of the Maastrichtian Stage. In total, twelve taxa are recognised from levels which are correlative with the Calcaire à Baculites of Manche (France), as well as with the Tercis les Bains section in southwest France, the Wisła (Vistula) River sections (central Poland) and the Western Interior of the United States. Associated cephalopods allow a detailed correlation between biozones based on those groups and on inoceramid bivalves. Keywords: Bivalvia, Inoceramidae, Maastrichtian, Maastrichtian type area, correlation Introduction angle, were referable to Belemnitella, and due to their small fissure angle resembled Belemnitella junior. Thus, this provides Recent studies of Late Cretaceous (Campanian-Maastrichtian) but a very rough estimate.