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The Givetian platform of the Ardenne Massif records several alternations between a siliciclastic-carbonate ramp and a carbonate shelf. Usually these depositional contexts are considered as a major disruption implying a perturbation of many ecological
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Wiley Online Library
Wiley Online Library
Autor:
Benoit L. M. Hubert, Bruno Mistiaen, Frédéric Boulvain, Stephen Kershaw, Joachim Reitner, Alan Reynolds, Anne-Christine Da Silva
Publikováno v:
Lethaia. 47:365-375
This paper records the first example of a demosponge spicule framework in a single specimen of a Devonian stromatoporoid from the Frasnian of southern Belgium. The small sample (2.5 × 2 cm) is a component in a brecciated carbonate from a carbonate m
Publikováno v:
Bulletin de la Société Géologique de France. 178:383-390
The specific biodiversity of stromatoporoids, tabulates and brachiopods from the Ardennes (707 taxa) has been analyzed stage-by-stage from the Lochkovian up to the Famennian. The diversity of each group may be correlated with external factors (e.g. f
Publikováno v:
Geological Society, London, Special Publications. 275:275-281
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
Publikováno v:
Bulletin de la Société Géologique de France. 176:355-361
Detailed petrographic and geochemical studies of pore-filling cements and replaced (epigenic) membranes of some organic-walled microorganisms preserved in the Neoproterozoic Doushantuo Lagerstätte (China) are based on an energy dispersive system (E
Publikováno v:
Parasitology. 138(1)
SUMMARYIntroduction. Palaeozoic calcareous sponges (stromatoporoids) are common bio-constructing fossils; they are sometimes found in association with helicoidal structures of unknown biological affinities. The interaction between the tube-forming or