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Insights into vase-shaped microfossil diversity and Neoproterozoic biostratigraphy in light of recent Brazilian discoveries

Published online by Cambridge University Press:  25 March 2019

L. Morais ,
D.J.G. Lahr ,
I.D. Rudnitzki ,
B.T. Freitas ,
G.R. Romero ,
S.M. Porter ,
A.H. Knoll  and
T.R. Fairchild
L. Morais
Affiliation:
Postdoctoral Researcher, Geochemistry and Geotectonics Program, Institute of Geosciences, Universidade de São Paulo – USP, Rua do Lago, 562, Cidade Universitaria, CEP: 05508-080, São Paulo, Brazil Postdoctoral Researcher, Departament of Geophysics, Institute of Astronomy, Geophysics and Atmospheric Sciences, Universidade de São Paulo, Rua do Matão, 1226, Cidade Universitaria, CEP: 05508-900, São Paulo, Brazil
D.J.G. Lahr
Affiliation:
Department of Zoology, Institute of Biosciences, Universidade de São Paulo – USP, Rua do Matão, travessa 14, 101, Cidade Universitária, CEP: 05508-090, São Paulo, Brazil
I.D. Rudnitzki
Affiliation:
Postdoctoral Researcher, Departament of Geophysics, Institute of Astronomy, Geophysics and Atmospheric Sciences, Universidade de São Paulo, Rua do Matão, 1226, Cidade Universitaria, CEP: 05508-900, São Paulo, Brazil Departament of Geology, Universidade Federal de Ouro Preto - DEGEO/UFOP. Morro do Cruzeiro, s/n – Bauxita, CEP: 35400-000, Ouro Preto, Brazil
B.T. Freitas
Affiliation:
Geology Laboratory, School of Technology, Universidade de Campinas - UNICAMP, Rua Paschoal Marmo, 1888, Jardim Nova Italia, CEP: 13484-332, Limeira, Brazil
G.R. Romero
Affiliation:
Postdoctoral researcher at the Geology and Geochemistry program, Institute of Geoscience, Universidade Federal do Pará, Rua – UFPA, Augusto Correa, s/n, CEP: 66075-110, Belém, PA, Brazil
S.M. Porter
Affiliation:
Department of Earth Sciences, University of California, Santa Barbara, Santa Barbara, California 93106, USA
A.H. Knoll
Affiliation:
Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138, USA
T.R. Fairchild
Affiliation:
Department of Sedimentary and Environmental Geology, Institute of Geosciences, Universidade de São Paulo – USP, Rua do Lago, 562, Cidade Universitária, CEP: 05508-080, São Paulo, Brazil
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Abstract

Vase-shaped microfossils (VSMs) occur in dolostone clasts within conglomerates, breccias, and diamictites of the Neoproterozoic Urucum Formation, Jacadigo Group, southwest 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 in Morais et al., 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, 2017) 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, Meisterfeld, and Knoll, 2003, C. torquata Porter, Meisterfeld, and Knoll, 2003, B. dacruchares Porter, Meisterfeld, and Knoll, 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.

UUID: http://zoobank.org/ac0becd6-29ff-4491-80fa-0291730fba65

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Journal of Paleontology , Volume 93 , Issue 4 , July 2019 , pp. 612 - 627
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Copyright © 2019, The Paleontological Society 

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