Current IF 1.175
Latest issue (RSS 2.0)
Contact Editorial Office at
Bulletin of Geosciences
Published by ©
Czech Geological Survey,
W. Bohemia Museum Pilsen
ISSN: 1802-8225 (online),
Cambrian trilobite Ovatoryctocara Tchernysheva, 1962 from Siberia
Published in: Bulletin of Geosciences, volume 86, issue 3; pages: 405 - 422; Received 23 December 2010; Accepted in revised form 28 July 2011; Online 9 September 2011
Keywords: Cambrian, Siberian sections, GSSP Series 2 and 3, Ovatoryctocara, intraspecies variability,
AbstractAt present the species of the genus Ovatoryctocara Tchernysheva, 1962 are important stratigraphic markers of the boundaries between the traditional lower and middle Cambrian strata of Siberia. However, the vague taxonomic concept of the species and the lack of clear illustrations, which might demonstrate intraspecies variability, make the solution of the stratigraphic objective difficult. In regards to these problems, the genus has been revised on the basis of collections from east Siberian sections. Emended diagnoses for O. ovata (Tchernysheva, 1960), O. granulata (Tchernysheva, 1962), O. angusta (Tchernysheva, 1962), including subspecies O. angusta snegirevae (Suvorova, 1964), and O. doliiformis Korovnikov & Shabanov, 2008 are provided. In addition, the similarity between Siberian representatives of O. granulata and the specimens from South China and Greenland is established, based on meraspid morphology. Revision of the species shows that in the River Molodo section, O. granulata appears 20–25 cm higher than was previously documented.
Babcock, L.E., Peng, S., Geyer, G. & Shergold, J.H. 2005. Changing perspectives on Cambrian chronostratigraphy and progress toward subdivision of the Cambrian System. Geosciences Journal 9, 101-106.
Bachturov, C.F., Evtyshenko, V.M. & Pereladov, V.S. 1988. Kuonamskaya bituminous sparry limestone formation (Kuonamskaya bituminoznaya karbonatno-slantsevaya formatsya). 156 pp. Nauka, Novosibirsk. [in Russian]
Blaker, M.R. & Peel, J.S. 1997. Lower Cambrian trilobites from North Greenland. Meddelelser om Gronland. Geoscience 35, 1-145.
Butov, Y.P., Korde, K.B., Dolmatov, K.A., Osadchaya, D.V., Neberikutina, L.N., Orlova, E.F., Minina, O.R., Vertluzhskikh, L.I. & Chulkova, A.P. 2003. Atlas on Paleozoic fossil flora and fauna of the Republic Buriytia. 171 pp. Buriytsky Scientific Centre of Siberian Academy of Science Publishing House, Ulan-Ude. [in Russian]
Egorova, L.I., Shabanov, Y.Y., Rozanov, A.Y., Savitsky, V.E., Tchernysheva, N.E & Shishkin, B.B. 1976. Elansk and Kuonamsk facies stratotypes in the lower boundary of the Siberian Middle Cambrian. Trudy Sibiriskogo nauchno issleddovatel’skogo Instituta Geologii, Geofiziki i Mineral’nogo Syr’ya 211, 1-167. [in Russian]
Fletcher, T.P. 2003. Ovatoryctocara granulata: the key to a global Cambrian stage boundary and the correlation of the olenellid, redlichiid and paradoxidid realms. Special Papers in Palaeontology 70, 73-102.
Fletcher, T.P. 2007. The base of Cambrian Series 3: the global significance of key oryctocephalid trilobite ranges in the Kaili Formation of South China. Memoir of the Association of Australasian Palaeontologists 33, 29-33.
Geyer, G. 2005. The base of a revised Middle Cambrian: are suitable concepts for a series boundary in reach? Geosciences Journal 9(2), 81-99.
Geyer, G. 2006. First African oryctocephalid trilobites from the Lower-Middle Cambrian boundary interval. Paleoworld 15(3-4), 348-359.
Korovnikov, I.V. & Shabanov, Y.Y. 2008. Trilobites from boundary rocks of Lower-Middle stratotype section on Molodo River (East of the Siberian Platform). Cambrian sections of the Siberian Platform - candidates for stratotypes of subdivisions of the International Stratigraphical scheme (Stratigraphy and Palaeontology), 71-104. Materials for 13th International Field Conference of the Cambrian Stage Subdivision Working Group. SB RAN, Novosibirsk. [in Russian]
Kryskov, L.N., Lazarenko, N.P., Ogienko, L.V. & Tchernysheva, N.E. 1960. New early Palaeozoic trilobites of Eastern Siberia and Kazakhstan, 211-255. In Markovsky, B.P. (ed.) New species of prehistoric plants and invertebrates of the USSR, Vol. 2. VSEGEI, Moscow. [in Russian]
Savitsky, V.E., Evtushenko, V.M., Egorova, L.I., Kontorovitch, A.E. & Shabanov, Y.Y. 1972. Cambrian of the Siberian Platform (the Yudoma-Olenek type section. Kuonamka complex). Trudy Sibiriskogo nauchno-issledovatel’skogo Instituta Geologii, Geofiziki i Mineral’nogo Syr’ya 130, 1-199. [in Russian]
Shabanov, Y.Y., Korovnikov, I.V., Pereladov, V.S. & Fefelov, A.F. 2008a. Excursion 1a. The traditional Lower-Middle Cambrian boundary in the Kuonamka Formation of the Molodo River section (the southeastern slope of the Olenek Uplift of the Siberian Platform) proposed as a candidate for GSSP of the lower boundary of the Middle Cambrian and its basal (Molodian) stage, defined by the FAD of Ovatoryctocara granulata, 8-59. The Cambrian System of the Siberian Platform. Part 2: North-East of the Siberian Platform. XIII. International Field Conference Cambrian Stage subdivision Working Group. PIN RAS, Moscow & Novosibirsk.
Shabanov, Y.Y., Korovnikov, I.V., Pereladov, V.S., Pak, K.L. & Fefelov, A.F. 2008b. Kuonamka Formation on Molodo River - a candidate for global stratotype of the lower boundary of the Middle Cambrian (East of the Siberian Platform). Cambrian sections of the Siberian Platform - candidates for stratotypes of subdivisions of the International Stratigraphical scheme (Stratigraphy and Palaeontology), 59-70. Materials for 13th International Field Conference of the Cambrian Stage Subdivision Working Group. SB RAN, Novosibirsk.
Shergold, J.H. 1969. Oryctocephalidae (Trilobita: Middle Cambrian) of Australia. Bulletin of Bureau of Mineral Resources, Geology and Geophysics 104, 1-66.
Suvorova, N.P. 1964. Corynexochoid trilobites and their evolutionary history. Trudy Paleontologicheskogo Instituta 103, 1-319. [in Russian]
Tchernysheva, N.E. 1962. Cambrian trilobites of the family Oryctocephalidae, 3-64. In Shvedov, N.A. (ed.) Trudy nauchnoissledovatel’skii geologii Institut Arktiki (NIIGA) 127. 188 pp. Leningrad. [in Russian]
Walcott, C.D. 1908. Cambrian Geology and Paleontology. 2. Cambrian trilobites. Smithsonian Miscellaneous Collections 53, 13-52.
Whittington, H.B. 1995. Oryctocephalid trilobites from the Cambrian of North America. Palaeontology 38(3), 543-562.
Yazmir, M.M., Dolmatov, B.A. & Yazmir, I.K. 1975. Atlas on Paleozoic and Mesozoic flora and fauna of Buryatskaya ASSR. 184 pp. Nedra, Moscow. [in Russian]
Yuan, J.L., Zhao, Y.L. & Li, Y. 2001a. Notes on the classification and phylogeny of oryctocephalids (Trilobita: Arthropoda). Acta Palaeontologica Sinica 40 (Supplement), 214-226. [in English with Chinese abstract]
Yuan, J.L., Zhao, Y.L. & Li, Y. 2001b. Notes of Oryctocephalid trilobites. Acta Palaeontologica Sinica 40 (Supplement), 143-156.
Yuan, J.L., Zhao, Y.L., Li, Y. & Huang, Y.Z. 2002. Trilobite fauna of the Kaili Formation (uppermost Lower Cambrian-lower Middle Cambrian) from southeastern Guizhou, South China. 422 pp. Shanghai Science and Technology Press, Shanghai. [in Chinese with English summary]
Yuan, J.L., Zhao, Y.L., Peng, J., Zhu, X. & Lin, J.P. 2009. Cambrian trilobite Ovatoryctocara granulata Tchernysheva, 1962 and its biostratigraphic significance. Progress in Natural Science 19(2), 213-221.