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A new record of early Silurian land plant spores from the Paraná Basin, Paraguay (Malvinokaffric Realm)

Published online by Cambridge University Press:  01 May 2009

Jane Gray ,
A. J. Boucot ,
Yngve Grahn  and
Gregory Himes
Jane Gray
Affiliation:
Department of Biology, University of Oregon, Eugene, OR 97403, USA
A. J. Boucot
Affiliation:
Department of Zoology, Oregon State University, Corvallis, OR 97331-2914, USA
Yngve Grahn
Affiliation:
Stockholm University, Department of Geology and Geochemistry, S-10691 Stockholm, Sweden
Gregory Himes
Affiliation:
Texaco Overseas Holding Inc., c/o Amoseas, 237 Orchard Point, Post Office, Singapore, Republic of Singapore 9123
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Abstract

The first conclusive evidence for Silurian rocks in the Paraná Basin, Brazil, was reported in 1985. This evidence was based on organic-walled microfossils, principally spore tetrads, and associated phytoplankton (‘acritarchs’ and prasinophytes), the first recovered from the Vila Maria Formation on the northeastern rim of the Basin. The spore assemblage was typical of Gray's Microfossil Assemblage Zone I; size-frequency data for the tetrads suggested an early Silurian (early Llandovery; Rhuddanian) age. We now document a new MA Zone I occurrence of spore tetrads together with a few single trilete spores, from the southwestern rim of the Paraná Basin, Paraguay. The single spores are among the earliest known to have normally dissociated from a tetrahedral tetrad. Size-frequency data for the tetrads suggest a late Llandovery, pre-C5 (mid-Telychian) age. These spores, together with phytoplankton and chitinozoans, were recovered from beds laterally equivalent to the Vargas Peña Shale at the type locality from which Llandovery diplograptids and monograptids are known. Llandovery age rocks on the southwestern and northeastern borders of the Paraná Basin, c. 1400 km apart, suggest that early Silurian rocks were extensively distributed throughout southern Brazil and adjacent Paraguay. Close conformity between the age reference obtained with graptolites and spore tetrads again demonstrates the stratigraphic utility of early Silurian spores in providing reliable age determinations for otherwise unfossiliferous rocks. Spore tetrad assemblages available from the Malvinokaifric Realm (South America, Africa, Arabia) represent a distinct phytogeographic unit contrasted with spore tetrad assemblages from the North Silurian Realm of North America and parts of Europe.

Type
Articles
Information
Geological Magazine , Volume 129 , Issue 6 , November 1992 , pp. 741 - 752
Copyright
Copyright © Cambridge University Press 1992

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References

Babcock, L. E., Gray, J., Boucot, A. J., Himes, G. T. & Siegele, P. K. 1990. First Silurian conulariids from Paraguay. Journal of Paleontology 64, 897–902.CrossRefGoogle Scholar
Bär, P. & Riegel, W. 1980. Mikrofloren des hochsten Ordovizium bis tiefen Silurs aus der unteren Sekondi-Serie von Ghana (Westafrika) und ihre Beziehung zu den Itaim-Schichten des Maranhão-Beckens in NE-Brasilien. Neues Jahrbuch für Geologie und Paläontologie Abhandlungen 160, 42–60.Google Scholar
Berry, W. B. N. & Boucot, A. J. 1973. Correlation of the African Silurian rocks. Geological Society of America Special Paper 147, 1–83.CrossRefGoogle Scholar
Boucot, A. J. 1985. Late Silurian–Early Devonian biogeography, provincialism, evolution and extinction. Philosophical Transactions of the Royal Society of London B 309, 323–39.Google Scholar
Boucot, A. J. 1988. Ordovician–Silurian boundary in South America. In A Global Analysis of the Ordovician–Silurian Boundary (eds Cocks, L. R. M. and Rickards, R. B.), pp. 285–90. Bulletin, British Museum (Natural History), Geology 43.Google Scholar
Boucot, A. J. & Caster, K. E. 1984. First occurrence of Scaphiocoelia (Brachiopoda; Terebratulida) in the early Devonian of the Paraná Basin, Brazil. Journal of Paleontology 58, 1354–9.Google Scholar
Boucot, A. J., Rohr, D. M., Gray, J., Faria, A. de & Colbath, G. K. 1986. Plectonotus and Plectonotoides, new subgenus of Plectononotus (Bellerophontacea: Gastropoda) and their biogeographic significance. Neues Jahrbuch für Geologie und Palaontologie Abhandlunge 173, 167–80.CrossRefGoogle Scholar
Boucot, A. J., Melo, J. H. G. de, Santos Neto, E. V. & Wolff, S. 1991. First Clarkeia and Heterorthella (Brachiopoda; Lower Silurian) occurrence from the Paraná Basin, in eastern Paraguay. Journal of Paleontology 65, 512–14.CrossRefGoogle Scholar
Brito, I. M. 1967. Silurian and Devonian Acritarcha from Maranhá Basin, Brazil. Micropaleontology 13, 473–82.CrossRefGoogle Scholar
Burgess, N. D. 1991. Silurian cryptospores and miospores from the type Llandovery area, south-west Wales. Palaeontology 34, 575–99.Google Scholar
Burjack, M. I. A. & Popp, M. T. B. 1981. A occurência do icnogênero Arthrophycus no Paleozóico da Bacia do Paraná. Pesquisas, Porto Alegre 14, 163–8.Google Scholar
Caputo, M. V. 1984. Glaciacão neodevoniana no continente Gonduana ocidental. Anais do XXXIII Congresso Brasileiro de Geologia 2, 725–39.Google Scholar
Caster, K. E. 1947. Expedicão geológica em Goiás e Mato Grosso. Mineração e Metalurgia 12, 126–7.Google Scholar
Ciguel, J. H. G. 1988. Tentaculites itacurubiensis n. sp., dos depósitos regressivos do Paraguai oriental, Siluriano inferior da bacia do Paraná. Revista Brasileira de Geociências 18, 86–92.CrossRefGoogle Scholar
Cocks, L. R. M. 1972. The origin of the Silurian, Clarkeia shelly fauna of South America, and its extension to west Africa. Palaeontology 15, 623–30.Google Scholar
Cocks, L. R. M., Brunton, C. H. C., Rowell, A. J. & Rust, I. C. 1970. The first lower Palaeozoic fauna from South Africa. Quarterly Journal of the Geological Society of London 125, 583–603.CrossRefGoogle Scholar
Cocks, L. R. M. & Fortey, R. A. 1986. New evidence on the South African Lower Palaeozoic: age and fossils reviewed. Geological Magazine 123, 437–44.CrossRefGoogle Scholar
Degraff, J. M., Franco, F. & Orue, D. 1981. Interpretación geofísica y geológica del Valle de Ypacaral (Paraguay) y su formación. Revista Asociación Géologica Argentina 36, 240–56.Google Scholar
Duffield, S. L. 1985. Land-derived microfossils from the Jupiter Formation (Upper Llandoverian), Anticosti Island, Quebec. Journal of Paleontology 59, 1005–10.Google Scholar
Elles, B. L. & Wood, E. M. R. 1901–1918. A Monograph of British graptolites, parts I–XI. London: Palaeonto graphical Society, 539 pp.Google Scholar
Gray, J. 1965. Extraction techniques. In Handbook of Paleontological Techniques (eds Kummel, B. and Raup, D.), pp. 530–87. San Francisco: W. H. Freeman.Google Scholar
Gray, J. 1985. The microfossil record of early land plants: advances in understanding of early terrestrialization, 1970–1984. Philosophical Transactions of the Royal Society of London B309, 167–95.Google Scholar
Gray, J. 1988. Land plant spores and the Ordovician–Silurian boundary. In A Global Analysis of the Ordovician–Silurian Boundary (eds Cocks, L. R. M. and Rickards, R. B.), pp. 351–8. Bulletin, British Museum (Natural History), Geology 43.Google Scholar
Gray, J. 1989. Adaptive radiation of early land plants. 28th International Geological Congress, Abstract Volume 1, I-582–I-583.Google Scholar
Gray, J. 1991. Tetrahedraletes, Nodospora and the ‘cross’ tetrad: an accretion of myth. In Pollen and Spores: Patterns of Diversification (eds Blackmore, S. and Barnes, S.), pp. 49–87. Oxford: Clarendon Press.CrossRefGoogle Scholar
Gray, J. & Boucot, A. J. 1972. Palynological evidence bearing on the Ordovician–Silurian paraconformity in Ohio. Bulletin Geological Society of America 83, 1299–314.CrossRefGoogle Scholar
Gray, J. & Boucot, A. J. 1977. Early vascular land plants: proof and conjecture. Lethaia 10, 145–74.CrossRefGoogle Scholar
Gray, J., Colbath, G. K., Faria, A. de, Boucot, A. J. & Rohr, D. M. 1985. Silurian-age fossils from the Paleozoic Paraná Basin, southern Brazil. Geology 13, 521–5.2.0.CO;2>CrossRefGoogle Scholar
Gray, J., Laufeld, S. & Boucot, A. J. 1974. Silurian trilete spores and spore tetrads from Gotland: their implications for land plant evolution. Science 185, 260–3.CrossRefGoogle ScholarPubMed
Gray, J., Theron, J. N. & Boucot, A. J. 1986. Age of the Cedarberg Formation, South Africa and early land plant evolution. Geological Magazine 123, 445–54.CrossRefGoogle Scholar
Harrington, H. J. 1972. Silurian of Paraguay. In Correlation of the South American Silurian Rocks (eds Berry, W. B. N. and Boucot, A. J.), pp. 41–50. Geological Society of America Special Paper 133.CrossRefGoogle Scholar
Jaeger, H. 1976. Das Silur und Unterdevon vom thüringischen Typ in Sardinien und seine regional geologische Bedeutung. Nova Acta Leopoldina n. s. 45 (224), 263–99.Google Scholar
Lange, F. W. 1972. Silurian of Brazil. In Correlation of the South American Silurian Rocks (eds Berry, W. B. N. and Boucot, A. J.), pp. 33–9. Geological Society of America Special Paper 133.CrossRefGoogle Scholar
Melo, J. H. G. de & Boucot, A. J. 1990. Harringtonina is Anabaia (Brachiopoda, Silurian, Malvinokaifric Realm). Journal of Paleontology 64, 363–6.CrossRefGoogle Scholar
Pacini, E. 1990. Tapetum and microspore function. In Microspores: Evolution and Ontogeny (eds Blackmore, S. and Knox, R. B.), pp. 213–37. Academic Press.CrossRefGoogle Scholar
Richardson, J. B. 1988. Late Ordovician and Early Silurian cryptospores and miospores from north-east Libya. In Subsurface Palynostratigraphy of North east Libya (eds El-Arnauti, A., Owens, B. and Thusu, B.), pp. 89–109. Benghazi: Garyounis University Publications.Google Scholar
Ruedemann, R. 1929. Climacograptus innotatus var. brasiliensis. In Una zone de Graptolitos do Liandovery inferior no Rio Trombetas, Estado do Para, Brasil (C. J. Maury) Monographias do Servicio Geoldgico e Mineralógico do Brasil, Ministerio da Agricultura, Industria e Commercio no. 7, 21–4, 27–9, 47–53.Google Scholar
Seilacher, A. & Alidou, S. 1988. Ordovician and Silurian trace fossils from northern Benin (W Africa). Neues Jahrbruch für Geologie und Palãontologie, Monatshefte, 431–9.CrossRefGoogle Scholar
Turner, J. C. M. 1959. Faunas graptoliticas de América del Sur. Revista Asociación Geológica Argentina 14, 1–180.Google Scholar
Wang Yu, , Boucot, A. J., Rong Jia-Yu, & Yang Xue Chang, 1987. Community paleoecology as a geologic tool: the Chinese Ashgillian–Eifelian (latest Ordovician through early Middle Devonian) as an example. Geological Society of America Special Paper 211, 100 pp.Google Scholar
Wolfart, R. 1961. Stratigraphie und Fauna des älteren Paläozoikums (Silur, Devon) in Paraguay. Geologische Jahrbuch 78, 29–102.Google Scholar
Wood, G. D., Miller, M. A., Sawicki, D. A. & Shinel Decker, C. L. 1989. Chitinozoans and microplankton from the Silurian Vargas Peña Shale (ItacurubI Group), Chaco Basin, Paraguay. Palynology 13, 288.Google Scholar