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Data from: Insights into VSM diversity and Neoproterozoic biostratigraphy in the light of recent Brazilian discoveries

Citation

Morais, Luana et al. (2018), Data from: Insights into VSM diversity and Neoproterozoic biostratigraphy in the light of recent Brazilian discoveries, Dryad, Dataset, https://doi.org/10.5061/dryad.kg8tf1s

Abstract

Vase-shaped microfossils occur in dolostone clasts within conglomerates, breccias and diamictites of the Neoproterozoic Urucum Formation, Jacadigo Group, SW Brazil. Although their taphonomic history is distinct from those of other VSM assemblages, morphometric comparison of Urucum fossils with five others described previously from North America and Europe show that two of the Urucum species --- the long-necked Limeta lageniformis Morais, Fairchild and Lahr, 2017 and the funnel-necked Palaeoamphora urucumense Morais et al., 2017 occur in the Kwagunt and Callison Lake assemblages, as does Pakupaku kabin Riedman, Porter and Calver, 2017 recently described from the Togari Group, Tasmania. Obelix rootsii Cohen, Irvine and Strauss, 2017a (new combination), previously known only from the Callison Lake Formation, is documented here from the Kwagunt Formation. In addition, Trigonocyrillium horodyskii (Bloeser, 1985) and Bonniea dacruchares Porter, Meisterfeld and Knoll 2003, first described from the Kwagunt assemblage, have now been found in the Urucum Formation. In light of this survey, 16 of the 18 validly described VSM species are now known to occur in the Kwagunt Formation and 13 in the Callison Lake Formation, with 12 of them shared by both formations. The fact that the Urucum VSM assemblage exhibits six of seven species in common with the Kwagunt Formation --- L. lageniformis, P. urucumense, Cycliocyrillium simplex Porter et al., 2003, C. torquata Porter et al., 2003, B. dacruchares Porter et al., 2003, and T. horodyskii (Bloeser, 1985) --- and all but the last of these in common with the Callison Lake Formation supports correlation of these three assemblages and indicates that the source of the fossiliferous clasts within the Urucum Formation may well have been a now vanished late Tonian carbonate platform

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