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Tome III: Die bryozoen des klassischen Dano Montiens von Mons
Voigt, E (1987). Tome III: Die bryozoen des klassischen Dano Montiens von Mons. Toelichtende Verhandelingen voor de Geologische Kaart en Mijnkaart van België = Mémoires pour servir à l'explication des cartes géologiques et minières de la Belgique, 17(3). Geologische Dienst van België: Brussel. 161 p., 23 pl., 3 tbl. pp.
Part of: Toelichtende Verhandelingen voor de Geologische Kaart en Mijnkaart van België = Mémoires pour servir à l'explication des cartes géologiques et minières de la Belgique. Belgische Geologische Dienst: Bruxelles. ISSN 0408-9510, more

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Document type: Scientific report

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  • Voigt, E

Abstract
    In this paper the Bryozoa of the Dano-Montian from the new scientific Borehole in Mons and the older classic Borehole of the "puits artésien de l'Ecole des Mines" (now Faculté des Mines) in Mons are described. Among the 58 species of Bryozoa are 18 Cyclostomata and 40 Cheilostamata. These comprise only a part of the very much richer Bryozoan Fauna of the Dano-Montian, in particular that of the Tuffeau de Ciply and its basal bed (Poudingue de la Malogne) m Belgium and the so -called "Postmaastrichtian " of the Netherlands (South Limburg).The following genera are new : Retecavella, Monticellaria, Diplobeisselina, Schizemiellopsis and Taenioporella.The subgenus Puncturiellina is new.New species are : Crisidia lagaaiji. Retepondea pseudolichenoides, Rectecavella broodi, Callopora tegulata, Pithodella impar. Stamenocella marlierei, Planicellaria bugei, "Membranipora" rectangulata, "Membranipora" subclavatoides, Onychocella meijeri, Pseudothyracella ciplyensis, Floridina eisdenensis, Floridina membraniporoides, Lunulites ratheimensis, Hemistylus dissimilis, Monticellaria obscure n.g n.sp., Porina hamulifera and Floridina scutata brevior n.subsp.The uppermost 1 2 m of the Möns Borehole, corresponding to the stratotype of the Montian sensu stricto, has yielded a very characteristic assemblage of cheilostomatous Bryozoa consisting almost entirely of segments of articulated ("cellariiform") zoaria, among which Monsella eocene (MEUNIER & PERGENS), Poricellaria diplodidymyoides (MEUNIER & PERGENS), Pseudothyrecelle (?) mucronete. Nellia pergensii DARTEVELLE and Nellie tenelle LAMARCK and other flexible genera predominate.This assemblage settling on seaweeds indicates a high energy environment in Litoral and Sublitoral zones, and IS itself of no biostratigraphical significance. This part of the succession approximately equates with the upper Triginglymus horizon of the ostracod zonation established by MARLI ERE (1 958) for the Ecole des Mines Borehole. The underlying succession of the Möns Borehole comprises a transition zone with Cytheretta and a deeper horizon with Cytherelloidee, which corresponds to the Tuffeau de Ciply. In contrast to the Ostracoda, the Bryozoa exhibit no significant fauna! change between the upper and lower units. The considerable number of bryozoan species in the Tuffeau de Ciply, which are known also from the Baltic Daman, supports the idea - already suggested by other palaeontological and micropalaeontological studies (e.g. BERGGREN (1 964) RASMUSSEN (1 962, 1 965) MEIJER (1 969), POZARYSKA (1 966), MOORKENS (1982), that the Tuffeau de Ciply equates with the Middle and Upper Danian, even though many of the characteristic species of the type Danian are lacking m the Belgian and Dutch Dano-Montian. Due to the fact, that no bryozoan faunal sequences are known from the Paleocene, which continue through to the Eocene and which can be compared with the material considered here, it is not yet possible to erect a zonation for the Dano-Montian and later Paleocene based on Bryozoa alone. To avoid misunderstanding, the term "Dano-Montian" is retained here to cover the bryozoan faunes of the southern faunal province comprising Belgium, the Netherlands and western Germany in contradistinction to those of the boreal province comprising the Baltic - Polish Danian and Selandian. The possibility cannot be excluded, that the bryozoan faunas in question, including those of the Tuffeau de Ciply and the Limburg "Postmaastrichtian", are partly later, and perhaps even of Selandian age. This problem is discussed in the light of micropalaeontological investigations.

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