New data from Oman indicate benthic high biomass productivity coupled with low taxonomic diversity in the aftermath of the Permian–Triassic Boundary mass extinction

Détails

ID Serval
serval:BIB_457A7227D68F
Type
Article: article d'un périodique ou d'un magazine.
Sous-type
Etude de cas (case report): rapporte une observation et la commente brièvement.
Collection
Publications
Titre
New data from Oman indicate benthic high biomass productivity coupled with low taxonomic diversity in the aftermath of the Permian–Triassic Boundary mass extinction
Périodique
Lethaia
Auteur(s)
Brosse Morgane, Bucher Hugo, Baud Aymon, Frisk  Åsa, Goudemand Nicolas, Hagdorn Hans, Nützel Alexander, Ware David, Hautmann Michael
ISSN
0024-1164
ISSN-L
0024-1164
Statut éditorial
Publié
Date de publication
2019
Peer-reviewed
Oui
Volume
52
Numéro
2
Pages
165-187
Langue
anglais
Résumé
A new Early Triassic marine fauna is described from an exotic block (olistolith) from the Ad Daffah conglomerate in eastern Oman (Batain), which provides new insights into the ecology and diversity during the early aftermath of the Permian–Triassic Boundary mass extinction. Based on conodont quantitative biochronology, we assign a middle Griesbachian age to the upper part of this boulder. It was derived from an offshore seamount and yielded both nektonic and benthic faunas, including conodonts, ammonoids, gastropods and crinoid ossicles in mass abundance. This demonstrates that despite the stratigraphically near extinction at the Permian–Triassic Boundary, Crinoidea produced enough biomass to form crinoidal limestone as early as middle Griesbachian time. Baudicrinus, previously placed in Dadocrinidae, is now placed in Holocrinidae; therefore, Dadocrinidae are absent in the Early Triassic, and Holocrinidae remains the most basal crown-group articulates, originating during the middle Griesbachian in the Tethyan Realm. Abundant gastropods assigned to Naticopsis reached a shell size larger than 20 mm and provide another example against any generalized Lilliput effect during the Griesbachian. Whereas the benthic biomass was as high as to allow the resumption of small carbonate factories, the taxonomic diversity of the benthos remained low compared to post-Early Triassic times. This slow benthic taxonomic recovery is here attributed to low competition within impoverished post-extinction faunas.
Mots-clé
benthos, biotic recovery, Griesbachian, Oman, Permian–Triassic Boundary
Données de la recherche
Création de la notice
30/10/2019 18:17
Dernière modification de la notice
31/10/2019 16:02
Données d'usage