A silicified Early Triassic marine assemblage from Svalbard

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Title: A silicified Early Triassic marine assemblage from Svalbard
Authors: Foster, William J.Danise, SilviaTwitchett, Richard J.
Permanent link: http://hdl.handle.net/10197/10921
Date: 10-Nov-2016
Online since: 2019-07-18T10:15:24Z
Abstract: Understanding how the marine biosphere recovered from the late Permian mass extinction event is a major evolutionary question. The quality of the global fossil record of this interval is, however, somewhat poor due to preservational, collection and sampling biases. Here we report a new earliest Induan (Hindeodus parvus Zone) marine assemblage from the Deltadalen Member of the Vikingh√łgda Formation, central Spitsbergen, which fills a critical gap in knowledge. The fully silicified fossils comprise the oldest silicified assemblage known from the Triassic and provide critical new systematic data. For its age, the assemblage is exceptionally diverse with 14 species of bivalves and gastropods, as well as conodonts and ammonoids. Four new bivalve species (Austrotindaria antiqua, A. svalbardensis, Nucinella taylori and N. nakremi) and one new gastropod species (Glabrocingulum parvum) are described, and five families are recorded in the Induan for the first time. Some of the common and globally widespread Early Triassic taxa, such as Unionites, are also present, and their exceptional preservation reveals key morphological characters that are documented for the first time. Taxonomic and ecological revisions based on these new data suggest that shallow-infaunal deposit-feeders were a dominant component of pre-Spathian benthic communities. The gastropods and bivalves all possessed a planktotrophic larval stage, which may have been a particular advantage in the wake of the late Permian mass extinction.
Type of material: Journal Article
Publisher: Taylor & FrancisNatural Environment Research Council (NERC) grant [NE/I005641]
Journal: Journal of Systematic Palaeontology
Volume: 15
Issue: 10
Start page: 851
End page: 877
Copyright (published version): 2016 the Authors
Keywords: ExtinctionEarly TriassicDiversificationMolluscaProtobranchiaChemosymbiosis
DOI: 10.1080/14772019.2016.1245680
Language: en
Status of Item: Peer reviewed
Appears in Collections:Earth Sciences Research Collection

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