Facies and palaeoecology of the upper member of the Aisemont Formation (Late Frasnian, S. Belgium): an unusual episode within the Late Frasnian crisis

The upper member of the Aisemont Formation – also known as the “second biostrome” - is the last significant Upper Frasnian carbonate unit in the northern part of the Namur-Dinant Basin (Southern Belgium). It consists of bioclastic limestone, often dolomitized, with numerous oncoids and corals. Despite its local name, the member is not a biostrome because only one thin bed is constructed by corals. It is mainly composed of limestone with numerous oncoids and a rich fauna of opportunistic organisms (bryozoans, brachiopods, gastropods, sponges, etc.) where Phillipsastrea and Frechastraea are the... Mehr ...