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Earliest Arenig radiolarians from the Cow Head Group, Western Newfoundland

Published online by Cambridge University Press:  14 July 2015

Mun-Zu Won  and
William J. Iams
Mun-Zu Won
Affiliation:
1Department of Marine Science, Pusan National University, Pusan 609-735, South Korea,
William J. Iams
Affiliation:
2Environmental Science Studies, Grenfell Campus, Memorial University of Newfoundland, University Drive, Corner Brook A2H 6P9, Canada,
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Abstract

Radiolarians have been recovered from lowermost Arenigian rocks of the Cow Head Group in Gros Morne National Park, Newfoundland. Two new faunal assemblages include eight families, 13 genera, and 25 species. Among these, the family Neoaspiculumidae, the genus Neoaspiculum, and 11 species, Beothuka aitchisoni, B. grosmornensis, B. stougei, B.? stellata, Neoaspiculum cancellium, N. headense, N. transformum, N. laxum, N.? amplum, Proventocitum cylindricum, and P. piriforme, are new.

This study elucidates the reason for the significant difference in species composition between pre-Arenigian and Arenigian radiolarian faunas. This difference does not appear to be due to mass extinction, but rather to phylogenetic evolution: most radiolarian families that flourished during pre-Arenig time were gradually but significantly reduced by the earliest Arenig. Characteristic features of the earliest Arenig assemblages that distinguish them from their Tremadocian predecessors are 1) the development of a distinctive skeletal constructional element referred to as “bandage” structure that evolved through modification of a mesh of thin bars and 2) the appearance of multiple concentric shells including a proloculus (or a microsphere), which developed from a primitive three-dimensionally interwoven meshwork or spongy shell wall. These forms, represented by beothukids, antygoporids, and inaniguttids, are rare but they appear to originate in the earliest Arenig. Transitional characteristics among those forms are developed in the Neoaspiculumidae, which flourished during the earliest Arenig.

The precise biostratigraphic age of one of the assemblages was determined with the recovery of the index condont Prioniodus adami Stouge and Bagnoli, 1988 from strata belonging to the Tetragraptus approximatus Graptolite Zone, which is at the base of the Arenigian.

Type
Research Article
Information
Journal of Paleontology , Volume 85 , Issue 1 , January 2011 , pp. 156 - 177
Copyright
Copyright © The Paleontological Society 

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References

Aitchison, J. C. 1998. A Lower Ordovician (Arenig) radiolarian fauna from the Ballantrae Complex, Scotland. Scottish Journal of Geology, 34:73–81.CrossRefGoogle Scholar
Aitchison, J. C., Flood, P. G., and Malpas, J. 1998. Lowermost Ordovician (basal Tremadoc) radiolarians from the Little Port Complex, western Newfoundland. Geological Magazine, 135:413–419.CrossRefGoogle Scholar
Apollonov, M. K., Zhemchuzhnikov, V. G., and Dubinina, S. V. 1990. Ordovik Severo-Zapadnogo Pribalkhash'ya. [Ordovician deposits in the northwestern Balkhash region]. Izvestiya Akademii Nauk Kazakhskoy SSR, Seriya Geologicheskaya, Khabarlary Kazakh SSR, Fylym Akademiyasynyn, 4:3–16. (In Russian).Google Scholar
Bengtson, S. 1986. Siliceous microfossils from the Upper Cambrian of Queensland. Alcheringa, 10:195–216.CrossRefGoogle Scholar
Danelian, T. and Popov, L. 2003. Ordovician radiolarian biodiversity; Insights based on new and revised data from Kazakhstan. Bulletin de la Société géologique de France, 174:325–335.CrossRefGoogle Scholar
Fortey, R. A. and Holdsworth, B. K. 1972. The oldest known well-preserved Radiolaria. Bollettino della Societa Paleontologica Italiana, 10:35–41.Google Scholar
Holdsworth, B. K. 1977. Paleozoic Radiolaria; Stratigraphic distribution in Atlantic borderlands, p. 167–184. In Swain, F. M. (ed.), Stratigraphic Micropaleontology of Atlantic Basin and Borderlands. Developments in Paleontology and Stratigraphy, Elsevier.CrossRefGoogle Scholar
James, N. P. and Stevens, R. K. 1986. Stratigraphy and correlation of the Cambro-Ordovician Cow Head Group, western Newfoundland. Geological Survey of Canada Bulletin, 366, 143 p.Google Scholar
Kling, S. A. 1978. Radiolaria, p. 202–244. In Haq, B. U. and Boersma, A. (eds.), Introduction to Marine Micropalaeontology, Elsevier.Google Scholar
Kozur, H. W., Mostler, H., and Repetski, J. E. 1996. Well-preserved Tremadocian primitive Radiolaria from the Windfall Formation of the Antelope Range, Eureka County, Nevada, U.S.A. Geologisch-Palaeontologisch Mitteilungen Innsbruck, 21:245–271.Google Scholar
Kozur, H. W. and Repetski, J. E. 2002. Paulanoblella, nomen novum (Radiolaria) replaces Noblella Kozur, Mostler & Repetski, 1996, a homonym of Noblella Barbour, 1930 (Amphibia). Journal of Micropalaeontology, 21:128.CrossRefGoogle Scholar
Lindström, M. 1955. Conodonts from the lowermost Ordovician strata of south-central Sweden. Gelogiska Föreningens i Stockholm Förhandlingar, 76:517–604.CrossRefGoogle Scholar
Löfgren, A. 1998. Early to early Middle Ordovician conodont biostratigraphy of the Gillberga quarry, northern Öland, Sweden. Geologiska Föreningens i Stockholm Förhandlingar, 122:321–338.Google Scholar
Maletz, J. 2007. The Early Ordovician Beothuka terranova (Radiolaria) faunal assemblage in western Newfoundland. Paläontologische Zeitschrift, 81:71–82.CrossRefGoogle Scholar
Maletz, J. and Bruton, D. L. 2005. The Beothuka terranova (Radiolaria) assemblage and its importance for the understanding of early Ordovician radiolarian evolution. Geological Magazine, 142:711–721.CrossRefGoogle Scholar
Maletz, J. and Bruton, D. L. 2007. Lower Ordovician (Chewtonian to Castlemanian) radiolarians of Spitsbergen. Journal of Systematic Palaeontology, 5:245–288.CrossRefGoogle Scholar
Maletz, J. and Bruton, D. L. 2008. The Middle Ordovician Proventocitum procerulum radiolarian assemblage of Spitsbergen and its biostratigraphic correlation. Palaeontology, 51:1181–1200.CrossRefGoogle Scholar
Nazarov, B. B. 1975. Radiolaria of the Lower-Middle Paleozoic of Kazakhstan. Trudy Akademiia Nauk SSSR, Geologic Institute, 275, 203 p. (In Russian).Google Scholar
Nazarov, B. B. 1988. Radiolyarri Paleozoya. Prakiticheskoe Rukovodstvo po Mikrofaune SSSR, Nedra Press, Leningrad, 2, 232 p. (In Russian).Google Scholar
Nazarov, B. B., and Ormiston, A. R. 1984. Tentative system of Paleozoic radiolaria, p. 64–87. In Petrushevskaya, M. (ed.), Morphology, Ecology and Evolution of Radiolaria. Zoological Institute, Leningrad, Nauka. (In Russian).Google Scholar
Nazarov, B. B., and Ormiston, A. R. 1993. New biostratigraphically important Paleozoic Radiolaria of Eurasia and North America, p. 22–60. In Blueford, J. R. and Murchey, B. (eds.), Radiolaria of Giant and Subgiant Fields in Asia. Micropaleontology, Special Publication, Number 6.Google Scholar
Nazarov, B. B. and Popov, L. E. 1980. Stratigrafiya i fauna kremnistokarbonatnykh tolshch ordovika kazakhstana; radiolarii i bezzamkovye brakhiopody [Stratigraphy and fauna of the siliceous-carbonate sequence of the Ordovician of Kazakstan; radiolarians and inarticulate brachiopods]. Trudy Geologicheskiy Institut Akademiya Nauk SSSR, 331, 190 p. (In Russian).Google Scholar
Nedavizin, A. A. 1961. On the stratigraphy of Akzhal Formation in Cimili Mountains. Izvestiya Akademii Nauk Kazakhskoi SSR, p. 226–34. (In Russian).Google Scholar
Nikitin, I. F., Apollonov, M. K., Tasi, D. T., and Rukavishnikova, T. B. 1980. Ordovician System, p. 44–78. In Abdulin, A. A. (ed.), Chulliskii rudnyi poyas. Part 1. Geologiya Chu-lliiskogoregiona, Alma-Ata. (In Russian).Google Scholar
Pander, C. H. 1856. Monographie der fossilen Fische des Silurischen Systems der Russisch-Baltishen Gouvernements. Königlische Akademie der Wissenschaften, St. Petersburg, 91 p.Google Scholar
Repetski, J. E. 1982. Conodonts from the El Paso Group (Lower Ordovician) of westernmost Texas and southern New Mexico. New Mexico Bureau of Mines and Mineral Resources, Memoir 40, 121 p.CrossRefGoogle Scholar
Renz, G. W. 1990. Ordovician Radiolaria from Nevada and Newfoundland—A comparison at the family level. Marine Micropaleontology, 15:393–402.CrossRefGoogle Scholar
Stouge, S. and Bagnoli, B. 1988. Early Ordovician conodonts from Cow Head Peninsula, western Newfoundland. Palaeontographia Italica, 75:89–179.Google Scholar
Umeda, M. 2002. Taxonomy and diversity history of Paleozoic radiolarians; Seven extinction events. Journal of Geography, 111:33–54.CrossRefGoogle Scholar
Viira, V., Löfgren, A., Magi, S., and Wickström, J. 2001. An Early to Middle Ordovician succession of conodont faunas at Maekalda, northern Estonia. Geological Magazine, 138:699–718.CrossRefGoogle Scholar
White, R. D. 1986. Cambrian Radiolaria from Utah. Journal of Paleontology, 60:778–780.CrossRefGoogle Scholar
Williams, S. H., Barnes, C. R., O'Brien, F. H. C., and Boyce, W. D. 1994. A proposed global stratotype for the second series of the Ordovician System—Cow Head Peninsula, western Newfoundland. Bulletin of Canadian Petroleum Geology, 42:219–231.Google Scholar
Williams, S. H. and Stevens, R. K. 1987. Summary account of the Lower Ordovician (Arenig) graptolite biostratigraphy of the Cow Head Group, western Newfoundland. Bulletin of the Geological Society of Denmark, 35:259–270.CrossRefGoogle Scholar
Won, M.-Z. 1983. Radiolaria from the Lower Carboniferous of the Rheinische Schiefergebirge (Germany). Palaeontographica Abteilung A, 182:116–175. (In German).Google Scholar
Won, M.-Z. 1991. Lower Carboniferous radiolarians from siliceous boulders in western Germany. Journal of the Paleontological Society of Korea, 7:77–105.Google Scholar
Won, M.-Z. 1997. The proposed new radiolarian subfamily Retentactiniinae (Entactiniidae) from the Late Devonian (Frasnian) Gogo Formation, Australia. Micropaleontology, 43:371–418.CrossRefGoogle Scholar
Won, M.-Z. and Below, R. 1999. Cambrian radiolarians from the Georgina Basin, Queensland, Australia. Micropaleontology, 45:325–363.CrossRefGoogle Scholar
Won, M.-Z. and Iams, W. J. 2002. Late Cambrian radiolarian faunas and biostratigraphy of the Cow Head Group, western Newfoundland. Journal of Paleontology, 76:1–33.2.0.CO;2>CrossRefGoogle Scholar
Won, M.-Z., Blodgett, R. B., and Nestor, V. 2002. Llandoverian (Early Silurian) radiolarians from the Road River Formation of east-central Alaska and the new family Haplotaeniatumidae. Journal of Paleontology, 76:941–964.2.0.CO;2>CrossRefGoogle Scholar
Won, M.-Z., Iams, W. J., and Reed, K. M. 2005. Earliest Ordovician (early to middle Tremadocian) radiolarian faunas of the Cow Head Group, western Newfoundland. Journal of Paleontology, 79:433–459.2.0.CO;2>CrossRefGoogle Scholar
Won, M.-Z., Iams, W. J., and Reed, K. M. 2007. Late Tremadocian radiolarian faunas and biostratigraphy of the Cow Head Group, western Newfoundland, Canada. The Journal of the Korean Earth Science Society, 28:497–540.CrossRefGoogle Scholar