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Archive | 2012

Brachiopods and Their Auloporid Epibionts in the Devonian of Boulonnais (France): Comparison with Other Associations Globally

Bruno Mistiaen; Denise Brice; Mikołaj K. Zapalski; Christian Loones

From research undertaken on brachiopods encrusted by auloporids at two intervals in the Frasnian (Beaulieu and Ferques Formations) of Boulonnais (France), we conclude that the most important factors influencing encrustation were usually (in decreasing order): size of the host, morphology, feeding currents, shell orientation in vivo and shell ornament. Shell structure (punctate or impunctate) seems not to have influenced the rate of encrustation. In the cases discussed, most but not all auloporids encrusted their hosts in vivo. The most favourable environments for development of both brachiopods and epibionts seem to have been hard bottoms and thin limestone beds alternating with argillaceous beds. The influence of environmental (sedimentologic) conditions is difficult to precisely specify in terms of the development of encrustation, but seems to have played an important role.


Geological Society, London, Special Publications | 2007

Estimation of palaeoenvironmental changes: can analysis of distribution of tabulae in tabulates be a tool?

Mikołaj K. Zapalski; Benoît Hubert; Bruno Mistiaen

Abstract Growth periodicity (cyclomorphic variation) in corals is expressed by various features, among them changes in the distribution of tabulae. A method potentially useful in analysis of periodical environmental changes is proposed herein. Measurement of spaces between tabulae in tabulate corals and preparation of a histogram converted into a trend curve may show relative periodical fluctuations of the environment. Such an analysis, exemplified here on Givetian Pachyfavosites sp. from the Avesnois (northern France), shows that this method may be used as a tool for estimation of environmental changes.


Senckenbergiana Lethaea | 1999

Late Devonian stromatoporoid from the Sudetes Mountains (Poland), and endemicity of the Upper Famennian to Uppermost Famennian (=“Strunian”) stromatoporoid fauna in western Europe

Bruno Mistiaen; Dieter Weyer

A single large stromatoporoid specimen collected by one of us (D. W.) from the so called “Main Limestone” at Dzikowiec (= Ebersdorf) in the Sudetes Mountains of Lower Silesia, Poland, is here assigned toTrupetostromaParks 1936. It is typical of the Upper Famennian to Uppermost Famennian (= “Strunian”) stromatoporoid Assemblage no. 3 defined byStearn (1987) andStearn, Halim-Dihardja & Nishida (1987). This assemblage, confined to western Europe and Kazakhstan, is dominated by clathrodictyids but without labechiids. Other genera present together withTrupetostroma in this assemblage includeAmphipora, Anostylostroma, Atelodictyon, Clathrocoilona, Clathrodictyon, Clathrostroma, Gerronostroma, Petridiostroma andStromatopora. All those genera were widespread globally through the Middle and Upper Devonian (Givetian-Frasnian), but in the the Upper Famennian to Uppermost Famennian (= “Strunian”) deposits of western Europe they appear as typical “Lazarus taxa” — a consequence of the Frasnian/Famennian boundary Kellwasser Event which terminated reefal environments worldwide. Viewed at the generic level, the western European the Upper Famennian to Uppermost Famennian (= “Strunian”) stromatoporoid fauna is essentially ubiquitous, but at the species level endemism is pronounced. This may have resulted from reactivation of disjunct biotopes when conditions became conducive, locally, to renewed reefal development. This endemicity is analysed using the Jaccard Coefficient.RésuméUn unique spécimen de stromatopore de grande taille a été récolté par un de nous (D. W.) dans la localité polonaise de Dzikowiec (= Ebersdorf), en Basse Silésie, Monts Sudètes, dans le niveau qualifié «calcaire principal» d’un vaste olistholite. Ce stromatopore est attribué au genreTrupetostromaParks 1936. Il correspond typiquement à l’assemblage n° 3 de stromatopores du Famennien Supérieur — Famennien terminal (= «Strunian») défini parStearn (1987),Stearn, Halim-Dihardja & Nishida (1987). Cet assemblage, limité à l’Europe occidentale et au Kazakhstan, se caractérise par la présence de nombreux clathrodictyidés et l’absence de labéchiidés. Les autres genres qui, dans le the Famennien supérieur — Famennien terminal (= «Strunien») d’Europe occidentale, accompagnentTrupetostroma, sontAmphipora, Anostylostroma, Atelodictyon, Clathrocoilona, Clathrodictyon, Clathrostroma, Gerronostroma, Petridiostroma, Stromatopora. Au cours du Dévonien moyen (Givétien) et supérieur (Frasnien), tous ces genres étaient largement représentés dans les environnements récifaux à la surface du globe terrestre. Ainsi, en Europe occidentale, ces genres correspondent typiquement à des taxons «Lazare» survivant à l’événement Kellwasser, à la limite Frasnien/Famennien, qui a fait disparaître les environnement récifaux de la surface du globe. Si, au niveau générique, la faune de stromatopores du the the Famennien supérieur — Famennien terminal (= «Strunian») apparaît très ubiquiste en Europe occidentale, il faut toutefois souligner l’important endémisme spécifique lié à la reconquête de biotopes dispersés, lorsque les conditions redevinrent favorables au développement récifal. Cet endémisme est analysé à l’aide du coefficient de Jaccard.KurzfassungEine einzelne große Stromatopore, die von einem von uns (D. W.) im sog. „Haupt-Kalkstein“ von Dzikowiec (= Ebersdorf) in den Sudeten Unterschlesiens (Polen) aufgesammelt wurde, wird hier der GattungTrupetostromaParks 1936 zugeordnet. Sie ist typisch für die Stromatoporen-Vergesellschaftung Nr. 3 des oberen bis obersten (= „Strunium“) Famennium, wie sie vonStearn (1987) undStearn, Halim-Dihardja & Nishida (1987) definiert wurde. Diese Vergesellschaftung, die auf das westliche Europa und Kasachstan beschränkt ist, wird von Clathrocytiden dominiert, jedoch ohne Labechiiden. Weitere Gattungen, die zusammen mitTrupetostroma in dieser Vergesellschaftung vorkommen, sindAmphipora, Anostylostroma, Atelodictyon, Clathrocoilona, Clathrodictyon, Clathrostroma, Gerronostroma, Petridiostroma undStromatopora. All diese Gattungen waren im Mittel- und Ober-Devon (Givetium-Frasnium) im globalen Maßstab weit verbreitet, in den Ablagerungen des oberen bis obersten (= „Strunium“) Famennium im westlichen Europa stellen sie typische „Lazarus-Taxa“ dar — eine Folge des Kellwasser-Ereignisses an der Frasne/Famenne-Grenze, das weltweit die Riff-Habitate ausgelöscht hat. Betrachtet man die Stromatoporen-Fauna des westlichen Europa im oberen bis obersten (= „Strunium“) Famennium auf dem Gattungsniveau, ist sie allgegenwärtig; auf dem Artniveau hingegen sind Endemismen auffallend. Dieser Sachverhalt mag darauf hinweisen, daß aufgrund einer Reaktivierung auseinandergerissener Biotope und verbesserten Bedingungen es — lokal — zu erneuten Riff-Entwicklungen kommt. Dieser Endemismus wird analysiert unter Anwendung des Jaccard-Koeffizienten.


Geobios | 1991

Nouvelle interprétationmorphofonctionnelle du Stromatopore Frasnien Stachyodes australe

Bruno Mistiaen

Examination of fossil material from Frasnian age carbonates in Afghanistan and northern France allows for a newinterpretation of the somewhat enigmatic genus Keega (Wray, 1967). The genus Keega, which was originally interpreted as a red algae and later reinterpreted as representing the “basal layer” of the laminar form of the stromatoporoid Stachyodes Bargatzky, 1881, is here considered to represent the poorly calcified “upper part” where the living tissue of the stromatoporoid animal was located. The remainder of the coenosteum, now considered the “lower part”, represents the older layer progressively deserted by the living tissue of the stromatoporoid. This new morphofunctional interpretation is based on the positions of epizoans, spatially associated sedimentary structures and fossil orientations, macro-biomorphological features (growth direction, and direction of astrorhizae) and micro-bioconstructional features (orientations of water jet fibres) of the skeleton, and the differences in the microstructure between the upper and lower layers.


Geobios | 1997

Vacuustroma, un genre nouveaude stromatopore dendroïde du Dévonien du Vietnam et du Boulonnais (France)

Nguyen Huu Hung; Bruno Mistiaen

Resume Un genre nouveau de stromatopore dendroide, Vacuustroma , est decrit. Il est present dans le Devoniendu Vietnam, avec deux especes nouvelles, V. thanhlangense et V. sp. A. Il existe aussi dans le Devonien du Boulonnais (Nord de la France) avec une troisieme espece nouvelle, V. michelini . Le genre Vacuustroma se caracterise essentiellement par la microstructure vacuolaire de ses elements coenosteaux.


Geobios | 1997

Identité des genresStylostroma Gorsky, 1938 et Pennastroma Dong de-Yuan 1964, Stromatopores du Famennien supérieur (Strunien)

Bruno Mistiaen; Hou Hong Fei; Wu Xiantao

Resume Apres un historique du genre Pennastroma Dong De-Yuan , 1964, les relations entre ce genre et desgenres voisins de Labechiides sont analysees. Les caracteres retenus par Dong De-Yuan pour etablir son genre sont ensuite passes en revue; ils sont essentiellement bases sur la morphologie des piliers (primaires et secondaires) et leur aspect “en V” en section tangentielle. Ces caracteres ne semblent pas suffisants pour justifier une distinction generique avec le genre Stylostroma Gorsky , 1938. Pennastroma est un synonyme de Stylostroma.


Geobios | 1992

Épizoaires des Brachiopodes Frasniens de Ferques (Boulonnais, Nord de la France)

Denise Brice; Bruno Mistiaen


Acta Geologica Polonica | 2007

Selected benthic faunas from the Devonian of the Ardennes: an estimation of palaeobiodiversity

Benoît Hubert; Miko ̧Aj K. Zapalski; Jean-Pierre Nicollin; Bruno Mistiaen; Denise Brice


Bulletin De La Societe Geologique De France | 2007

The palaeobiodiversity of stromatoporoids, tabulates and brachiopods in the Devonian of the Ardennes – Changes through time

Mikołaj K. Zapalski; Benoît L. M. Hubert; Jean-Pierre Nicollin; Bruno Mistiaen; Denise Brice


Acta Geologica Polonica | 2008

Late Famennian ?Chaetosalpinx in Yavorskia (Tabulata): the youngest record of tabulate endobionts

Mikołaj K. Zapalski; Emilie Pinte; Bruno Mistiaen

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Denise Brice

Centre national de la recherche scientifique

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Jean-Pierre Nicollin

Centre national de la recherche scientifique

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Emilie Pinte

Centre national de la recherche scientifique

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Bernard Mottequin

Royal Belgian Institute of Natural Sciences

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