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The Late Maastrichtian bourgueticrinid crinoid Dunnicrinus aequalis(D'Orbigny, 1841) from The Netherlands and Belgium
Jagt, J.W.M.; Donovan, S.K.; Deckers, M.J.M.; Dortangs, R.W.; Kuypers, M.M.M.; Veltkamp, C.J. (1998). The Late Maastrichtian bourgueticrinid crinoid Dunnicrinus aequalis (D'Orbigny, 1841) from The Netherlands and Belgium. Bull. Kon. Belg. Inst. Natuurwet. Aardwet. = Bull. - Inst. r. sci. nat. Belg., Sci. Terre 68: 129-154
In: Bulletin van het Koninklijk Belgisch Instituut voor Natuurwetenschappen. Aardwetenschappen = Bulletin de l'Institut Royal des Sciences Naturelles de Belgique. Sciences de la Terre. KBIN: Brussel. ISSN 0374-6291, more
Peer reviewed article  

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Keywords
    Cretaceous; Cretaceous, Upper; Maastrichtian; Bourgueticrinidae Loriol, 1882 [WoRMS]; Crinoidea [WoRMS]; Belgium, Liège (Province) [Marine Regions]; Netherlands, Limburg (Province); Netherlands, Maastricht; Marine
Author keywords
    Crinoidea, Bourgueticrinidae, lagerstätte, Late Maastrichtian, The Netherlands, Belgium, Maastrichtien supérieur, Pays-Bas, Belgique

Authors  Top 
  • Jagt, J.W.M.
  • Donovan, S.K.
  • Deckers, M.J.M.
  • Dortangs, R.W.
  • Kuypers, M.M.M.
  • Veltkamp, C.J.

Abstract
    The bourgueticrinid "Bourgueticrinus" aequalis D'ORBIGNY, 1841 is by far the commonest Late Cretaceous crinoid species in the type area of the Maastrichtian Stage (NE Belgium, SE Netherlands). Many hundreds of thousands of dissociated ossicles, of crowns and columns alike, have been collected during recent years. Based on the Structure of the crown (number of arms and brachial articulation types), the species is best reclassified in the otherwise exclusively North American genus Dunnicrinus MOORE, 1967. It is particularly well represented in the Lanaye (Gulpen Formation), Valkenburg and Gronsveld (Maastricht Formation) Members, of Late Maastrichtian age. Rare occurrences of more or less completely preserved specimens, the result of obrution, have been given special attention. Material from one such crinoid "lagerstätte" from the base of the Gronsveld Member as exposed at the ENCI Nederland BV quarry, which includes attachment structures of unusual complexity with stereom overgrowths, is here described. This particular lagerstätte closely resembles that which yielded the Late Maastrichtian type species of the genus Dunnicrinus, D. mississippiensis MOORE, 1967. from the southern U.S.A.

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