High resolution conodont-graptolite biostratigraphy in the Middle-Upper Ordovician of the Sierra de La Invernada Formation (Central Precordillera, Argentina)
DOI:
https://doi.org/10.1344/105.000000249Keywords:
Graptolites, Conodonts, Ordovician, Argentine PrecordilleraAbstract
Outcrops on the western slope of the La Invernada Range, San Juan Precordillera (W Argentina), were surveyed for lithofacial analysis and graptolite-conodont high resolution biostratigraphy. The study profile for the upper Sierra de La Invernada Formation is approximately 500 m thick and is located in the northern part of the La Invernada Range. Successive shallowing-deepening sedimentary cycles crop out throughout the upper part of the formation. The dominantly lower turbiditic sandy deposits alternate with shaly pelagic sedimentation, and occasional coarser intervals that record gravitational flows. Hummocky structures occur in the uppermost part of the formation, indicating sedimentation under storm weather conditions. Rich graptolite faunas representing six upper Middle to lower Upper Ordovician biozones have been recorded from this section: Pterograptus elegans (tentative assignment), Hustedograptus teretiusculus, Nemagraptus gracilis, Climacograptus bicornis, Diplacanthograptus caudatus, and Climacograptus tubuliferus biozones. This graptolite biostratigraphy is complemented by the conodont records from successive productive levels, which yielded conodonts that represent the Pygodus serra, P. anserinus, Amorphognathus tvaerensis, and A. superbus biozones. The recorded conodont-graptolite assemblages allow for a correlation with the upper Darriwilian, Sandbian and lower Katian global stages, and provide preliminary biofacies records for the upper Sierra de La Invernada Formation.
References
Agematsu, S., Sashida, K., Salyapongse, S., Sardsud, A., 2007. Ordovician conodonts from the Satun area, southern Peninsular Thailand. Journal of Paleontology, 81, 19-37.
Albanesi, G.L., Ortega, G., 2002. Advances on conodont-graptolite biostratigraphy of the Ordovician System of Argentina. In: Aceñolaza, F.G. (ed.). Aspects of the Ordovician System in Argentina. Tucumán, INSUGEO, Serie Correlación Geológica, 16, 143-165.
Albanesi, G.L., Hünicken, M.A., Barnes, C.R., 1998. Bioestratigrafía de conodontes de las secuencias ordovícicas del cerro Potrerillo, Precordillera Central de San Juan, República Argentina. Córdoba, Actas de la Academia Nacional de Ciencias, 12, 7-72.
Albanesi, G.L., Hünicken, M.A., Ortega, G., 1995. Review of Ordovician conodont-graptolite bioestratigraphy of the Argentine Precordillera. 7th International Symposium on the Ordovician System, Las Vegas, 31-35.
Albanesi, G.L., Monaldi, C.R., Ortega, G., Trotter, L.A., 2007. The Capillas Fm (late Darriwilian) of Subandean Ranges, northwestern Argentina; age, correlation and environmental constraints. In: Li, J., Fan, J., Percival, I. (eds.). The Global Ordovician and Silurian. Acta Palaeontologica Sinica, 46, 9-15.
Alfaro, M., 1988. Graptolitos del Ordovícico Superior (Caradociano) de la quebrada Agua de la Cruz, Precordillera de Mendoza. Ameghiniana, 25, 299-303.
Astini, R.A., 2003. The Ordovician Proto-Andean basins. In: Benedetto, J.L. (ed.). Ordovician fossils of Argentina. Universidad Nacional de Córdoba, Secretaría de Ciencia y Tecnología: 1-74.
Astini, R.A., Brussa, E.D., 1997. Dos nuevas localidades fosilíferas en el Conglomerado de Las Vacas (Caradociano) en la Precordillera Argentina: Importancia cronoestratigráfica. Ameghiniana, 34, p. 114.
Banchig, A.L., 1995. Evolución del talud continental Cámbrico – Ordovícico entre el Río San Juan y Los Sombreros, San Juan. Doctoral thesis. Universidad Nacional de San Juan, 202 pp.
Banchig, A.L., 1996. Litofacies y paleoambiente sedimentario del Ordovícico clástico de la Sierra de La Invernada, (Formación Sierra de La Invernada), Precordillera Central, San Juan. VI Reunión Argentina de Sedimentología, Bahía Blanca, 111-116.
Banchig, A.L, Weidmann, C., Marchese, N., Federico, S., 2004. Vulcanismo submarino y flujos sedimentarios asociados, sur de la Sierra de La Invernada.Descripción e interpretación, Precordillera Occidental, San Juan. X Reunión Argentina de Sedimentología, San Luis, Actas de Resúmenes, 25-26.
Banchig, A.L., Ortega, G., Albanesi, G.L., Peralta, G.L., Voldman, G.G., 2007. Análisis litofacial y bioestratigráfico de eventos eustáticos en el lapso darriwiliano-katiano (Ordovícico Medio – Superior), en la sierra de La Invernada, Precordillera Central, Argentina. In: Díaz-Martínez, E., Rábano, I. (eds.). 4th European Meeting on the Palaeontology and Stratigraphy of Latin America, Madrid, Cuadernos del Museo Geominero, 8, 33-38.
Basilici, G., Cutolo, A., Gomes Borges, J.P., Henrique, A., Moretti, P.A., 2005. Ordovician storm-dominated basin and the evolution of the western Gondwana margin (Portezuelo del Tontal, Sierra de La Invernada and Yerba Loca formations, Argentine Precordillera). In: Pankhurst, R.J., Veiga, G.D. (eds.). Gondwana 12 “Geological and Biological Heritage of Gondwana”, Mendoza, Academia Nacional de Ciencias, Abstracts, p. 64.
Bauer, J.A., 1987. Conodonts and conodont biostratigraphy of the McLish and Tulip Creek Formations (Middle Ordovician) of south-central Oklahoma. Oklahoma Geological Survey Bulletin, 141, 1-53.
Bauer, J.A., 1994. Conodonts from the Bromide Formation (Middle Ordovician), South-Central Oklahoma. Journal of Paleontology, 68, 358-376.
Benedetto, J.L., Herrera, Z.A., Ortega, G., 1991. Bioestratigrafía del Ordovícico en el flanco occidental del cerro Potrerillo, Provincia de San Juan. Revista de la Asociación Geológica Argentina, 56, 60-68.
Bergström, S.M., 1971. Conodont biostratigraphy of the Middle and Upper Ordovician of Europe and eastern North America. In: Sweet, W.C., Bergström, S.M. (eds.). Symposium on conodont biostratigraphy, Columbus, Geological Society of America Memory, 127, 83-157.
Bergström, S.M., 1978. Middle and Upper Ordovician conodont and graptolite biostratigraphy of the Marathon, Texas graptolite zone reference standard. Palaeontology, 21, 723-758.
Bergström, S.M., 1983. Biogeography, evolutionary relationships, and biostratigraphic significance of Ordovician platform conodonts. Fossils and Strata, 15, 35-58.
Bergström, S.M., 1990. Biostratigraphic and biogeographic significance of Middle and Upper Ordovician conodonts in the Girvan succession, South-west Scotland. Courier Forschungsinstitut Senckenberg, 118, 1-43.
Bergström, S.M., Mitchell, C.E., 1992. The Ordovician Utica Shale in the Eastern Midcontinent Region: age, lithofacies, and regional relationships. Oklahoma Geological Survey Bulletin, 145, 1-86.
Bergström, S.M., Mitchell, C.E., 1994. Regional relationships between late Middle and early Late Ordovician standard successions in New York and Quebec and the Cincinnati region in Ohio, Indiana, and Kentucky. New York State Museum Bulletin, 481, 5–10.
Bergström, S.M., Rhodes, F.H.T., Lindström, M., 1987. Conodont biostratigraphy of the Llanvirn-Llandeilo and Llandeilo-Caradoc Series boundaries in the Ordovician System of Wales and the Welsh Borderland. In: Austin, R.L. (ed.). Conodonts: Investigative Techniques and Applications. Chichester, Ellis Horwood Limited, 294-315.
Bergström, S.M., Riva, J., Kay, M., 1974. Significance of conodonts, graptolites, and shelly faunas from the Ordovician of Western and North-Central Newfoundland. Canadian Journal of the Earth Sciences, 11, 1625-1660.
Bergström, S.M., Finney, S.C., Chen Xu, Goldman, D., Leslie, S.A., 2006. Three new Ordovician global stage names. Lethaia, 39, 287-288.
Bergström, S.M., Finney, S.C., Chen Xu, Pålsson, C., Wang Zhi-hao, Grahn Y., 2000. A proposed global boundary stratotype for the base of the Upper Series of the Ordovician System: The Fågelsång section, Scania, southern Sweden. Episodes, 23, 102-109.
Berry, W.B.N., 1960. Graptolite faunas of the Marathon region, West Texas. University Texas Publication, 6005, 179 pp.
Blasco, G., Ramos, V.A., 1976. Graptolitos caradocianos de la Formación Yerba Loca y del cerro La Chilca, departamento de Jáchal, provincia de San Juan. Ameghiniana, 13, 312-329.
Brussa, E.D., 1995. Upper Middle Ordovician graptolites from the Western Precordillera, Argentina. 5th International Graptolite Conference, Long Beach, Graptolite News, 8, 15-16.
Brussa, E.D., 1996. Las graptofaunas ordovícicas de la Formación Las Aguaditas, Precordillera de San Juan, Argentina. Parte I. Ameghiniana, 33, 421-434.
Brussa, E.D., 1997a. La Biozona de Paraglossograptus tentaculatus (Graptolithina) en la Formación Sierra de La Invernada, Precordillera Occidental, Argentina. Geobios, 30, 15-29.
Brussa, E.D., 1997b. Graptolitos del Arenigiano tardío-Llanvirniano de la Formación Sierra de La Invernada, Precordillera Occidental sanjuanina, Argentina. Parte 1. Ameghiniana, 34, 357-372.
Brussa, E.D., 1997c. Graptolitos del Arenigiano tardío-Llanvirniano de la Formación Sierra de La Invernada, Precordillera Occidental sanjuanina, Argentina. Parte 2. Ameghiniana, 34, 373-383.
Brussa, E.D., 1999. El género Holmograptus (Graptolithina) en el Ordovícico de la Precordillera Occidental argentina. Revista Española de Paleontología, 14, 183-190.
Brussa, E.D., Mitchell, C.E., Astini, R.A., 1999. Ashgillian (Hirnantian ?) graptolites from the western boundary of the Argentine Precordillera. In: Kraft, P., Fatka, O., (eds.). Quo vadis Ordovician? 8th ISOS, Praghe, Acta Universitatis Carolinae, Geologica, 43, 199-202.
Brussa, E.D., Toro, B.A., Benedetto, J.L., 2003a. Biostratigraphy. In: Benedetto, J.L. (ed.). Ordovician fossils of Argentina. Universidad Nacional de Córdoba, Secretaría de Ciencia y Tecnología: 75-90.
Brussa, E.D., Mitchell, C.E., Ortega, G., Maletz, J., Astini, R.A, 2003b. Middle Ordovician graptolite biostratigraphy from the Los Azules Formation at Los Gatos Creek, Central Precordillera, Argentina. In: Ortega, G., Aceñolaza, G.F. (eds.). Proceedings 7th International Graptolite Conference and Field Meeting of the International Subcommission on Silurian Stratigraphy. Tucumán, INSUGEO, Serie Correlación Geológica, 18, 21-25.
Caballé, M., Cuerda, A.J., Alfaro, M., Furque, G., 1993. Nuevos hallazgos de graptolitos en el Ordovícico de la sierra del Tigre, Precordillera de San Juan. XII Congreso Geológico Argentino y II Congreso de Exploración de Hidrocarburos, Mendoza, Actas II, 268-280.
Caballé, M., Furque, G., Cuerda, A.J., Alfaro, M., 1992. Nuevos hallazgos de graptolitos en la Formación Sierra de La Invernada (Ordovícico), Precordillera de San Juan, Argentina. Ameghiniana, 29, 9-26.
Caballé, M., Furque, G., González, P., Cuerda, A.J., Alfaro, M., 1997. Nuevos datos sobre la bioestratigrafía del Ordovícico de San Juan, Argentina. II Jornadas de Geología de Precordillera, San Juan, Actas, 22-28.
Chen, Xu, Ni, Yu-Nan, Mitchell, C.E., Qiao, Xin-Dong, Zhan, Shi-Gao, 2000. Graptolites from the Qilang and Yigan Formations (Caradoc, Ordovician) of Kalpin, Western Tarim, Xinjiang, China. Journal of Paleontology, 74, 282-300.
Cuerda, A.J., Alfaro, M., 1993. Faunas graptolíticas. In: Ramos, V.A. (ed.). XII Congreso Geológico Argentino y II Congreso de Exploración de Hidrocarburos, Mendoza, Relatorio II, 287-292.
Cuerda, A.J., Alfaro, M., Caballé, M., 1999. Neurograptus cf. N. margaritatus (LAPWORTH) (Graptolithina) en la sierra de La Invernada (Ordovícico), Precordillera de San Juan, Argentina. Ameghiniana, 36, 49-54.
Cuerda, A.J., Cingolani, C.A., Manassero, M., 1998. Caradoc age of the graptolite assemblages and facial relations from the cerro Bola section, San Rafael Block, Mendoza Province, Argentina. In: Gutiérrez-Marco, J.C., Rábano, I. (eds.). Proceedings 6th International Graptolite Conference (GWG-IPA) and 1998 Field Meeting of the IUGS Subcommission on Silurian Stratigraphy, Madrid, Temas GeológicoMineros ITGE, 23, 170-173.
Cuerda, A.J., Cingolani, C.A., Schauer, O.C., Varela, R., 1986. Bioestratigrafía del Ordovícico (Llanvirniano-Llandeiliano) de la sierra del Tontal, Precordillera de San Juan. Descripción de su fauna graptolítica. Ameghiniana, 23, 3-33.
Dzik, J., 1983. Relationships between Ordovician Baltic and North American Midcontinent conodont faunas. Fossils and Strata, 15, 59-86.
Dzik, J., 1994. Conodonts of the Mójcza Limestone. In: Dzik, J., Olempska, E., Pisera, A. (eds.). Ordovician carbonate platform ecosystem of the Holy Cross Mountains. Palaeontologia Polonica, 53, 43-128.
Finney, S.C., 1986. Graptolite biofacies and correlation of eustatic, subsidence, and tectonic events in the Middle and Upper Ordovician of North America. Palaios, 1, 435-461.
Finney, S.C., Bergström, S.M., 1986. Biostratigraphy of the Ordovician Nemagraptus gracilis Zone. In: Hughes, C.P., Rickards, B.R. (eds.). Palaeoecology and biostratigraphy of graptolites, Gelogical Society Special Publication, 20, 47-59.
Furque, G., 1972. Los movimientos caledónicos en Argentina. Revista Museo de La Plata, (n.s.) 8, 129-136.
Furque, G., 1983. Descripción Geológica de la Hoja 19c, Ciénaga de Gualilán. Buenos Aires, Boletín de la Secretaría de Minería, 193, 111 pp.
Furque, G., Caballé, M., 1985. Paleozoico Inferior en el Cerro Bayo, Sierra de la Invernada, San Juan. Revista del Museo de la Plata (Nueva Serie), Geología, 10(81), 1-18.
Furque, G., Caballé, M., 1988. Descripción Geológica de la Sierra de La Invernada, Precordillera de San Juan. Buenos Aires, Dirección Nacional de Geología y Minería, 120 pp. (unpublished)
Furque, G., Cuerda, A.J., Caballé, M., Alfaro, M., 1990. El Ordovícico de la Sierra de la Invernada y su fauna de graptolitos, San Juan. Revista del Museo de la Plata (N.S.) Paleontología 9(56), 159-181.
Goldman, D., 2003. The Diplacanthograptus caudatus Zone: a proposal for a new, globally recognizable, Upper Ordovician graptolite zone. In: Albanesi, G.L., Beresi, M.S., Peralta, S.H. (eds.). Ordovician from the Andes. INSUGEO, Serie Correlación Geológica, 17, 65-70.
Goldman, D., Bergström, S.M, Mitchell, C.E., 1995. Revision of the Zone 13 graptolite biostratigraphy in the Marathon, Texas, standar succession and its bearing on Upper Ordovicidan graptolite biogeography. Lethaia, 28, 115-128.
Goldman, D., Mitchell, C.E., Joy, M.P, 1999. The stratigraphic distribution of graptolites in the classic Middle Ordovician Utica Shale of New York State: an evolutionary succession or a response to relative see-level change? Paleobiology, 25, 273-294.
Goldman, D., Leslie, S.A., Nõlvak, J., Young, S., 2007. The Black Knob Ridge section, Southeastern Oklahoma, USA: The global stratotype-section and point (GSSP) for the base of the Katian Stage of the Upper Ordovician Series. Acta Palaeontologica Sinica, 46 (Suppl.), 144-154.
Gosen, W. von, 1992. Structural evolution of the Argentine Precordillera: the Río San Juan section. Journal of Structural Geology, 14, 643-667.
Harris, A.G., Bergström, S.M., Ethington, R.L., Ross, R.J., Jr., 1979. Aspects of Middle and Upper Ordovician conodont biostratigraphy of carbonate facies in Nevada and southeast California and comparison with some Appalachian successions. In: Sandberg, C.A., Clark, D.L. (eds.). Conodont Biostratigraphy of the Great Basin and Rocky Mountains. Brigham Young University Geology Studies, 26, 7-43.
Heredia, S., 2001. Late Llanvirn conodonts from the Ponón Trehué Formation, Mendoza, Argentina. Gaia, 16, 101-117.
Heredia, S., Rosales, C., 2006. Biofacies de conodontes de la Formación Ponon Trehué y la importancia bioestratigráfica, sección tipo para el límite del Ordovícico Medio- Ordovícico Superior de Cuyania (Argentina). Temas de la Geología Argentina, INSUGEO, Serie Correlación Geológica, 21, 7-16.
Heredia, S., Gallardo, G., Maldonado, A., 1990. Conodontes caradocianos en las calizas alóctonas del miembro superior de la Formación Empozada (Ordovícico Medio y Superior), San Isidro (Mendoza, Argentina). Ameghiniana, 27, 197-206.
Hünicken, M.A., Ortega, G., 1987. Lower Llanvirn-Lower Caradoc (Ordovician) conodonts and graptolites from the Argentine Central Precordillera. In: Austin, R.L. (ed.). Conodonts: Investigative Techniques and Applications. Chichester, Ellis Horwood Limited, 136-145.
Keller, M., Eberlein, S., Lehnert, O., 1993. Sedimentology of Middle Ordovician carbonates in the Argentine Precordillera: Evidence for regional relative sea-level changes. Geologische Rundschau, 82, 362-377.
Kennedy, D.J., Barnes, C.R., Uyeno, T.T., 1979. A Middle Ordovician conodont faunule from the Tetagouche Group, Camel Back Mountain, New Brunswick. Canadian Journal of Earth Sciences, 16, 540-551.
Lehnert, O., Bergström, S.M., Keller, M., Bordonaro, O., 1999. Ordovician (Darriwilian-Caradocian) conodonts from the San Rafael Region, west-central Argentina: biostratigraphic, paleoecologic, and paleogeographic implications. Boletino della Società Paleontologica Italiana, 37, 199-214.
Leslie, S.A., 2000. Mohawkian (Upper Ordovician) conodonts of Eastern North America and Baltoscandia. Journal of Paleontology, 74, 1122-1147.
Maletz, J., 1997. Graptolites from the Nicholsonograptus fasciculatus and Pterograptus elegans (Abereiddian, Ordovician) of the Oslo region, Norway. Greifswalder Geowissenschaftliche Beiträge, 4, 5-98.
Mitchell, C.E., Brussa, E.D., Toro, B.A., Astini, R.A., 1998. Late Ordovician graptolites from the Empozada Formation, Argentine Precordillera, an outer shelf, cool water, periGondwanan assemblage? In: Gutiérrez-Marco, J.C., Rábano, I. (eds.). Proceedings 6th International Graptolite Conference (GWG-IPA) and 1998 Field Meeting of the IUGS Subcommission on Silurian Stratigraphy, Madrid, Temas Geológico-Mineros ITGE, 23, 224-226.
Nõlvak, J., Goldman, D., 2007. Bioestratigraphy and taxonomy of three-dimensionally preserved nemagraptids from the Middle and Upper Ordovician of Baltoscandia. Journal of Paleontology, 81, 254-260.
Ortega, G., 1987. Las graptofaunas y los conodontes de la Formación Los Azules, Cerro Viejo, zona de Huaco, Departamento Jáchal, San Juan. Doctoral Thesis. Universidad Nacional de Córdoba, 210 pp.
Ortega, G., 1995. Graptolite zones of the Los Azules Formation (Middle Ordovician) from Precordillera, western Argentina. 5º International Graptolite Conference, Long Beach, Graptolite News, 8, 57-59.
Ortega, G., Albanesi, G.L., 1998. The record of Nemagraptus gracilis Biozone in the Argentine Precordillera. In: Gutiérrez-Marco, J.C., Rábano, I. (eds.). Proceedings 6th International raptolite Conference (GWG-IPA) and 1998 Field Meeting, IUGS Subcommission on Silurian Stratigraphy, Madrid, Temas Geológico-Mineros ITGE, 23, 231-235.
Ortega, G., Brussa, E.D., 1990. La Subzona de Climacograptus bicornis (Caradociano temprano) en la Formación Las Plantas en su localidad tipo, Precordillera de San Juan, Argentina. Ameghiniana, 27, 281-288.
Ortega, G., Brussa, E.D., Astini, R.A., 1991. Nuevos hallazgos de graptolitos en la Formación Yerba Loca y su implicancia estratigráfica, Precordillera de San Juan, Argentina. Ameghiniana, 28, 163-178.
Ortega, G., Albanesi, G.L., Banchig, L.A., Peralta, G.L., 2004. Bioestratigrafía de graptolitos y conodontes de la Formación Sierra de La Invernada (Ordovícico Medio a Superior), Precordillera de San Juan, Argentina. Ameghiniana, Suplemento, 41, p. 17.
Ortega, G., Albanesi, G.L., Banchig, L.A., Peralta, G.L., 2006. Graptolitos y conodontes del Ordovícico Medio y Superior en la Sierra de La Invernada, Precordillera de San Juan, Argentina. 9º Congreso Argentino de Paleontología y Bioestratigrafía, Simposio 2, Bioestratigrafía del Paleozoico Inferior, Córdoba, p. 162.
Ortega, G., Albanesi, G.L., Banchig, L.A., Peralta, G.L., 2007. Graptolites and conodonts of early Katian age (Late Ordovician) from the Sierra de La Invernada Formation, San Juan Precordillera, Argentina. Acta Palaeontologica Sinica, 46 (Suppl.), 357-363.
Ortega, G., Albanesi, G.L., Heredia, S.E., Beresi, M.S., 2007. Nuevos registros de graptolitos y conodontes ordovícicos de las formaciones Estancia San Isidro y Empozada, quebrada San Isidro, Precordillera de Mendoza. Ameghiniana, 44, 697-718.
Ottone, E.G., Albanesi, G.L., Ortega, G., Holfeltz, G.D., 1999. Palynomorphs, conodonts and associated graptolites from the Ordovician Los Azules Formation, Central Precordillera, Argentina, Micropaleontology, 45, 225-250.
Pålsson, C., Månsson, K., Bergström, S.M., 2002. Biostratigraphical and palaeoecological significance of graptolites, trilobites and conodonts in the Middle Upper Ordovician Andersö Shale: an unusual “mixed facies” deposit in Jämtland, central Sweden. Transactions of the Royal Society of Edinburgh, Earth Sciences, 93, 35-57.
Peralta, S.H., 1990. Nuevas graptofaunas de la Formación La Cantera, sierra de Villicum, Precordillera Oriental de San Juan, Argentina. V Congreso Argentino de Paleontología y Bioestratigrafía, Tucumán, Actas, 1, 59-66.
Peralta, S.H., Finney, S.C., 2002. The Upper Ordovician graptolite faunas of the Cuyania Terrane: Their biostratigraphic and paleogeographic significance in the western margin of Gondwana. In: Aceñolaza, F.G. (ed.). Aspects of the Ordovician System in Argentina. Tucumán, INSUGEO, Serie Correlación Geológica, 16, 41-70.
Peralta, S.H., Finney, S.C., Basilici, G., 2003. Portezuelo del Tontal Formation (Lower Caradoc), Western Precordillera, San Juan Province: its biostratigraphic and paleogeographic significance. In: Albanesi, G.L., Beresi, M.S., Peralta, S.H. (eds.). Ordovician from the Andes. Tucumán, INSUGEO, Serie Correlación Geológica, 17, 119-124.
Ramos, V.A., 2004. Cuyania, an exotic block to Gondwana: Review of a historical success and the present problems. Gondwana Research, 7, 1009-1026.
Rasmussen, J.A., 1998. A reinterpretation of the conodont Atlantic Realm in the late Early Ordovician (early Llanvirn). In: Szaniawski, H. (ed.). Proceedings of the Sixth European Conodont Symposium. Palaeontologia Polonica, 58, 67-77.
Riva, J., 1969. Middle and Upper Ordovician graptolite faunas of St. Lawrence Lowlands of Quebec, and of Anticosti Island. American Association of Petroleum Geologists Memoir, 112, 579-595.
Riva, J., 1974. A revision of some Ordovician graptolites of eastern North America. Palaeontology, 17, 1-40.
Stone, J., 1987. Review of investigative techniques used in the study of conodonts. In: Austin, R.L. (ed.). Conodonts: Investigative Techniques and Applications. Chichester, Ellis Horwood Limited, 17-34.
VandenBerg, A.H.M., Cooper, R.A., 1992. The Ordovician graptolite sequence of Australasia. Alcheringa, 16, 33-85.
Webby, B.D., Cooper, R.A., Bergström, S.M., Paris, F., 2004. Stratigraphic framework and time slices. In: Webby, B.D., Paris, F., Drosser, M.L., Percival, I.G. (eds.). The great Ordovician biodiversification event. New York, Columbia University Press, 41-47.
Williams, S.H., 1994. Revision and definition of the C. wilsoni graptolite Zone (middle Ordovician) of South Scotland. Transactions of the Royal Society of Edinburgh (Earth Sciences), 85, 143-157.
Williams, S.H., 1995. Middle Ordovician graptolites from the Lawrence Harbour Formation, central Newfoundland, Canada. Palaeontographica Abt. A, 235, 21-77.
Zalasiewicz, I., Rushton, A.W.A., Owen, A.W., 1995. Late Caradoc graptolitic faunal gradients across the Iapetus Ocean. Geological Magazine, 132, 611-617.
Zhang, J., 1998. The Ordovician conodont genus Pygodus. Palaeontologia Polonica, 58, 1-287.
Zhen, Y-Y., Percival, I.G., 2003. Ordovician conodont biogeography – reconsidered. Lethaia, 36, 357-370.
Zhen, Y-Y., Percival, I.G., Webby, B.D., 2003. Conodont faunas from the Mid to Late Ordovician Boundary interval of the Wahringa Limestone Member (Fairbridge Volcanics), Central New South Wales. Proceedings of the Linnean Society of New South Wales, 125, 141-164.
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