TABLE I
Table showing key correlation features for several Neoproterozoic units dominated by Bavlinella and/or Leiosphaeridia. Features shown include radiochronometric constraints (mainly U-Pb), δ13C, 87Sr/86Sr and relative. Sources of data: 1: Chiglino 2013CHIGLINO L. 2013. Quimiestratigrafía e Biostratigrafía da Formação Frecheirinha (Grupo Ubajara)-Nordeste do Brasil. PhD Thesis, Universidade Federal de Pernambuco, UFPE/BCTG 2013/320, p. 1-101. and this work. 2: Germs et al. (1986) GERMS GJB, KNOLL AH AND VIDAL G. 1986. Latest Proterozoic microfossils from the Nama Group, Namibia (South West Africa). Precambrian Res 32: 45-62., Grotzinger et al. (1995) GROTZINGER JP, BOWRING SA, SAyLOR BZ AND KAUFMAN AJ. 1995. Biostratigraphic and Geochronologic Con straints on Early Animal Evolution. Science 270: 598-604.. 3: Gaucher (2000) GAUCHER C. 2000. Sedimentology, palaeontology and stratigraphy of the Arroyo del Soldado Group (Vendian to Cambrian, Uruguay). Beringeria 26: 1-120., Gaucher and Poiré (2009) GAUCHER C, SIAL AN, POIRÉ D, GÓMEZ-PERAL L, FERREIRA VP AND PIMENTEL MM. 2009. Chemostratigraphy. Neoproterozoic-Cambrian evolution of the Río de la Plata Palaeocontinent. In: Gaucher C, Sial AN, Halverson GP and Frimmel HE (Eds), Neoproterozoic-Cambrian tectonics, global change and evolution: a focus on southwestern Gondwana. Developments in Precambrian Geol, 16, Elsevier, p. 115-122., Gaucher et al. (2009) GAUCHER C, SIAL AN, POIRÉ D, GÓMEZ-PERAL L, FERREIRA VP AND PIMENTEL MM. 2009. Chemostratigraphy. Neoproterozoic-Cambrian evolution of the Río de la Plata Palaeocontinent. In: Gaucher C, Sial AN, Halverson GP and Frimmel HE (Eds), Neoproterozoic-Cambrian tectonics, global change and evolution: a focus on southwestern Gondwana. Developments in Precambrian Geol, 16, Elsevier, p. 115-122., Blanco et al. (2009) BLANCO G, RAJESH HM, GAUCHER C, GERMS GJB AND CHEMALE JR F. 2009. 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Re-Os geochronology of postglacial black shales in Australia: constraints on the timing of ''Sturtian'' glaciation. Geology 34: 729-732.. 7: Yin and Yuan (2007) YIN L AND YUAN X. 2007. Radiation of Meso-Neoproterozoic and early Cambrian protists inferred from the microfossil record of China. Palaeogeog, Palaeoclimatol, Palaeoecol 254: 350-361., Zhang et al. (2008) ZHANG S, JIANG G AND HAN Y. 2008. The age of the Nantuo Formation and Nantuo glaciation in South China. Terra Nova 20: 289-294.. 8: Germs et al. (2009) GERMS GJB, MILLER R MCG, FRIMMEL HE AND GAUCHER C. 2009. Syn- to late-orogenic sedimentary basins of southwestern Africa. Neoproterozoic to Early Palaeozoic evolution of southwestern Africa. In: Gaucher C, Sial AN, Halverson GP and Frimmel HE (Eds), Neoproterozoic-Cambrian tectonics, global change and evolution: a focus on southwestern Gondwana. Developments in Precambrian Geol, 16, Elsevier, p. 183-203., Halverson et al. 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