Francis Tourneur

A Preliminary-study of Ashgill Carbonate Beds From the Lower Part of the Fosses Formation (condroz, Belgium)

The sedimentology and palaeontology of carbonate beds in the lower part of the Fosses Formation (Ashgill of the Condroz area, central Belgium) have been investigated. Two depositional interpretations are suggested: deposition either near a platform-ramp margin as bioclastic turbidites and interbedded shales or on a shelf as a transgressive sequence following a regressive event. Faunal affinities with the Baltic area and Wales are confirmed, and the location of Belgium in the tropics during the Ashgill is supported by the calcareous algae and the coral fauna.

Revision of Parastriatopora gigantea (KNOD, 1908) (Anthozoa, Tabulata) from the Devonian of Bolivia

Abstract The revision and detailed description of the original material and several topotypic specimens of Parastriatopora gigantea ( Knod , 1908) from the Lower Devonian of Yaco (Bolivia) allow the selection of a lectotype and its diagnosis. A more precise geographic and stratigraphic location of the type locality is provided, together with a reassessment of its most probable age (Pragian-Emsian). Present knowledge of South American Devonian tabulate corals has important implications on their paleobiogeography. Data from Bolivia and Argentina suggest an earlier age for the extinction of Malvinokaffric taxa and reveal a greater abundance and specific diversity.

The Bainbridgia — Dualipora association (Cnidaria, Tabulata): palaeogeographical and palaeoecological implications

The genera Bainbridgia and Dualipora (Cnidaria, Tabulata) have been found together in 4 localities of Early Devonian age (Missouri, USA; Tafilalt, Morocco; Barrandian, Czechoslovakia; Horre, Germany). Several isolated occurrences of each are also reported. The palaeogeographical and palaeoecological implications of this association are discussed.

Précisions sur la structure et la microstructure du genreRoemeria Milne-Edwards & Haime 1851 (Tabulata, Dévonien moyen d’Allemagne et de Belgique)

Three Middle Devonian tabulate coral species assigned to the genusRoemeria Milne-Edwards & Haime 1851 are described:R. infundibulifera (Goldfuss 1829), the type species of the genus, andR. minor SCHLÜTER 1885, both from the Rheinisches Schiefergebirge, and a new species,R. cubiniensis, from the Couvin area of Belgium. Their external and internal characters and microstructures are described in detail. The dominant morphological features they have in common are cerioid and locally fasciculate corallites and tabulae with an infundibuliform profile. The microstructure of the corallite walls is characterized by an hitherto undescribed association of an internal fibrous zone and a peripheral lamellar zone flanking a median plate made of small granules and larger elements of stellate form. The only micro-structural variation between the three species lies in the proportions of these components. Kurzfassung: Drei mittel-devonische tabulate Korallen-Arten werden zur GattungRoemeria Milne-Edwards & Haime 1851 gestellt und beschrieben: die Typus-ArtenR. infundibulifera (Goldfuss 1829) sowieR. minor SchlÜter 1885, beide aus dem Rheinischen Schiefergebirge, und eine neue Art,R. cubiniensis, aus der Umgebung von Couvin in Belgien. Äußere und innere gemeinsame Merkmale sind cerioide und nur stellenweise bündeiförmige Koralliten mit einem infundibuliformen Profil der Tabulae im Längsschnitt. Die MikroStruktur der Koralliten-Wände ist durch die bisher nicht beschriebene Verbindung einer internen fibrösen Zone mit einer peripheren Lamellenschicht gekennzeichnet, die um eine Median-Lamelle aus kleinen und großen Granulae mit Stern-Profil angeordnet sind. Nur das Größen-Verhältnis dieser Struktur-Elemente ist bei den drei beschriebenen Arten verschieden.

Précisions sur la structure et la microstructure deRoemeria bohemica Počta 1902, espèce-type du genreRoemeripora Kraicz 1934 (Tabulata, Dévonien inférieur de Bohême)

The speciesRoemeria bohemica Počta has been revised on the basis of its original material and of topotypical specimens: its characters are in general consistent with those ofCalamopora infundibulifera Goldfuss 1829, type species of the genusRoemeria Milne-Edwards & Haime 1851.Roemeria bohemica is characterized by the numerous complex tabulae and the strong development of septal spines. These characters are considered by us of only specific importance and the genusRoemeripora Kraicz 1934, based onR. bohemica, is thus considered as a junior synonym ofRoemeria. An exhaustive list of the Devonian species attributed toRoemeria or toRoemeripora is given.KurzfassungDie tabulate Korallen-ArtRoemeria bohemica Počta 1902 wird an Hand des Originalmaterials und topotypischer Exemplare revidiert: Ihre Merkmale stimmen im wesentlichen mit denjnigen vonCalamopora infundibulifera GOLDFUSS 1829, der Typus-Art der GattungRoemeria Milne-Edwards & Haime 1851, überein.Roemeria bohemica is durch zahlreiche kompliziert gebaute Böden und starke Entwicklung von Septaldornen gekennzeichnet. Diese Merkmale kommen unseres Erachtens nur für die Art-Unterscheidung in Betracht; deshalb halten wir die GattungRoemeripora Kraicz 1934 mit der Typus-ArtR. bohemica für ein jüngeres Synonym vonRoemeria. Von den zuRoemeria oderRoemeripora gestellten Arten aus dem Devon wird eine vollständige Liste aufgestellt.RésuméLe TabuléRoemeria bohemica Počta 1902 a été revu à partir du matériel original et d’exemplaires topotypiques. Ses caractères sont dans l’ensemble comparables à ceux deCalamopora infundibulifera Goldfuss 1829, espèce-type du genreRoemeria Milne-Edwards & Haime 1851.Roemeria bohemica est caractérisée par de nombreux planchers complexes et par le fort développement des épines septales. Ces caractères sont considérés comme d’importance seulement spécifique et le genreRoemeripora Kraicz 1934, basée surR. bohemica, est par conséquent considéré comme un synonyme deRoemeria. Nous présentons une liste exhaustive des espèces dévoniennes attribuées àRoemeria ouRoemeripora.

Persistance de Favositides microlamellaires (Cnidaria, Tabulata) dans le Dévonien

Abstract The structural and microstructural study of some devonian ‘Favosites’ shows the persistence of the microlamellar species related to Paleofavosites until the lower Eifelian. The evolution of the wall is characterized by an increase of the size of the microlamellae and the substitution of the granules of the median dark line by fiber-like units.

Frasnian rugose and tabulate corals from the eastern Taurus (Kozan region, Turkey)

A section near the Kilgen Lake (Adana Province) has yielded a fauna of rugose and tabulate corals including Disphyllum cf. rugosum (Wedekind, 1922), D. cf. curtum Hill, 1954, Wapitiphyllum sp., Thamnopora sp., and Alveolites sp. This coral assemblage is consistent with the previous Frasnian age assigned to the limestones of the Gümüşali Formation. The rather well-preserved material provides new data on the structure and microstructure of Disphyllum and allows to describe in Thamnopora unusual calicinal morphology (septal ridges, median teeth, and pseudopercula) as well as new structures linked to the lateral increase (basal low wall, apical cul-de-sac).