Compositional and taphonomic gradients show fluctuating depositional conditions on Middle Jurassic brachiopod-rich accumulations from Northern Calcareous Alps (Austria–Germany)

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Title: Compositional and taphonomic gradients show fluctuating depositional conditions on Middle Jurassic brachiopod-rich accumulations from Northern Calcareous Alps (Austria–Germany)
Authors: García Joral, Fernando | Baeza Carratalá, José Francisco | Giannetti, Alice
Research Group/s: Cambios Paleoambientales
Center, Department or Service: Universidad de Alicante. Departamento de Ciencias de la Tierra y del Medio Ambiente
Keywords: Brachiopods | Western Tethys | Taphofacies | Jurassic | Northern Calcareous Alps | Depositional events
Issue Date: 15-Jun-2023
Publisher: Taylor & Francis
Citation: Historical Biology. 2023.
Abstract: Brachiopod-rich accumulations of the well-known ‘VilserKalk’ calcareous units from the Middle Jurassic of Zehrer (Allgäuer Alps) have been recognised and analysed from a taphonomic standpoint. These brachiopod concentrations are frequent in the Jurassic deposits of various Alpine-Mediterranean localities, usually related to resedimentation processes generated by high-hydrodynamic episodes. In the four brachiopod-bearing accumulations recorded, high concentrations of mainly articulate shells are preserved in pocket-like deposits made up of brachiopod communities with quite different structure, size-frequency distribution, diversity and taxonomic composition. The analysed taphocharacters indicate different hydrodynamic regimes of diverse intensity for each accumulation, resulting in a gradation of the resedimentation processes. The inferred transport of the shells from the source area is minimal, the bioclastic levels constituting para-autochthonous assemblages without significant spatial averaging. The four defined taphofacies include different assemblages that chronostratigraphycally span the latest Toarcian-early Bajocian interval. These taphofacies are interpreted in terms of depth-related variations concurring with environmental disturbance events in several phases of the evolutionary history of the basin, progressively ranging from shallower proximal accumulations to shell-beds originated in more distal depositional environments.
Sponsor: This research is a contribution to the Research Groups PBM-910431 (Complutense University of Madrid) and VIGROB-167 (University of Alicante) and to the Projects IGCP- 710 Western Tethys meets Eastern Tethys, and to the PID2019-104625RB-I00 project.
ISSN: 0891-2963 (Print) | 1029-2381 (Online)
DOI: 10.1080/08912963.2023.2221274
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2023 Informa UK Limited, trading as Taylor & Francis Group
Peer Review: si
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