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Skovsted, Christian B. ; Balthasar, Uwe ; Vinther, Jakob ; Sperling, Erik A. ; Álvaro, ed., Javier ( , Papers in Palaeontology)
Abstract The extraordinary window of phosphatized and phosphatic small shelly fossils (
SSF ) during the early and middle Cambrian is an important testament to the radiation of biomineralizing metazoans. WhileSSF are well known from most Cambrian palaeocontinents during this time interval, western Laurentia has relatively fewSSF faunas. Here we describe a diverseSSF fauna from the early Cambrian (Stages 3–4) Mural Formation at three localities in Alberta and British Columbia, Canada, complemented by carbon isotope measurements to aid in a potential future bio‐chemostratigraphic framework. The fauna expands the recordedSSF assemblage diversity in western Laurentia and includes several brachiopods, four bradoriids, three chancelloriids, two hyoliths, a tommotiid and a helcionellid mollusc as well as echinoderm ossicles and specimens ofMicrodictyon ,Volborthella andHyolithellus . New taxa include the tommotiid genusCanadiella gen. nov., the new bradoriid speciesHipponicharion perforata sp. nov. andPseudobeyrichona taurata sp. nov. Compared with contemporaneous faunas from western Laurentia, the fauna is relatively diverse, particularly in taxa with originally phosphatic shells, which appear to be associated with archaeocyathid build‐ups. This suggests that the generally low faunal diversity in western Laurentia may be at least partly a consequence of poor sampling of suitable archaeocyathan reef environments. In addition, the tommotiidCanadiella filigrana appears to be of biostratigraphical significance in Cambrian Stage 3 strata of western Laurentia, and the unexpected high diversity of bradoriid arthropods in the fauna also suggests that this group may prove useful for biostratigraphical resolution in the region. -
Colleary, Caitlin ; Dolocan, Andrei ; Gardner, James ; Singh, Suresh ; Wuttke, Michael ; Rabenstein, Renate ; Habersetzer, Jörg ; Schaal, Stephan ; Feseha, Mulugeta ; Clemens, Matthew ; et al ( , Proceedings of the National Academy of Sciences)
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Field, Daniel J. ; Boessenecker, Robert ; Racicot, Rachel A. ; Ásbjörnsdóttir, Lovísa ; Jónasson, Kristján ; Hsiang, Allison Y. ; Behlke, Adam D. ; Vinther, Jakob ; O'Regan, ed., Hannah ( , Palaeontology)