[en] Wellin patch reefs are small Upper Eifelian build?ups within the fine?grained argillaceous limestone of the Hanonet Formation. Whereas the reefs themselves are not well exposed, their fossil assemblage is accessible in the hills near the town of Wellin, approximately 40xA0km SE of Dinant in Belgium. It is especially rich in massive stromatoporoids, heliolitids and other tabulate corals. They exhibit predominantly domical and bulbous morphologies. This paper focuses primarily on the palaeoautoecology of the heliolitid corals and their relationships with other organisms. Cases of mutual overgrowth between heliolitids, other corals and stromatoporids suggest a high degree of competition for space on the reefs, possibly related to the scarcity of hard substrates. Coral and stromatoporoid growth forms, as well as the prevalence of micritic matrix, point to a relatively low energy environment. However, abundant growth interruption surfaces, sediment intercalations and rejuvenations of corals suggest episodically increased hydrodynamic regime and sediment supply. It is inferred that the patch reefs developed in a relatively shallow environment, where the reefal assemblage was regularly affected by storms. Heliolitids exhibited high sediment tolerance and relied on passive sediment removal for survival. They also could regenerate effectively and commonly overgrew their epibionts, after the colony’s growth was hampered by the sediment. This is recorded in extremely abundant growth interruption surfaces, which allow the analysis of the impact of sediment influxes on the heliolitid corals. ? 2021 Lethaia Foundation. Published by John Wiley & Sons Ltd
Disciplines :
Earth sciences & physical geography
Author, co-author :
Król, J.J.; Institute of Geology, Adam Mickiewicz University in Pozna?, ul. B. Krygowskiego 12, Pozna, 61?680, Poland
Denayer, Julien ; Université de Liège - ULiège > Département de géologie > Evolution and diversity dynamics lab
Wolniewicz, P.; Institute of Geology, Adam Mickiewicz University in Pozna?, ul. B. Krygowskiego 12, Pozna, 61?680, Poland
Zapalski, M.K.; Faculty of Geology, University of Warsaw, ul. ?wirki i Wigury 93, Warszawa, 02?089, Poland
Language :
English
Title :
Heliolitid corals and their competitors: a case study from the Wellin patch reefs, Middle Devonian, Belgium
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