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The Placentian Series: appearance of the oldest skeletalized faunas in southeastern Newfoundland

  • Ed Landing (a1), Paul Myrow (a2), Alison P. Benus (a3) and Guy M. Narbonne (a4)


The lowest Cambrian of Avalon, or Placentian Series, is a relatively thick sequence (1,400 m) in southeastern Newfoundland. A newly proposed body fossil zonation supplements an existing trace fossil zonation of the lower part of the Placentian Series and includes strata to the top of the sub-trilobitic Lower Cambrian.

The Sabellidites cambriensis Zone brackets the Precambrian–Cambrian boundary and comprises peritidal and wave-influenced subtidal facies deposited during deepening through the lower part of the Chapel Island Formation. Younger “Ladathecacylindrica Zone strata include the deepest facies of the Chapel Island Formation. The base of the overlying Watsonella crosbyi Zone (a post-Nemakit Daldyn and pre-Tommotian equivalent) is significantly diachronous because the diagnostic mollusks were preferentially preserved in pyritiferous offshore muds rather than in coeval nearshore muds. High diversity, upper Watsonella crosbyi Zone faunas (18 species) are limited to peritidal limestones of member 4 and are dominated by calcareous small shelly fossils. A thick interval (ca. 430 m) without body fossils and an important episode of block faulting that led to 750 m of differential erosion preceded deposition of the lower part of the Bonavista Group (=Sunnaginia imbricata Zone, an interval considered to be largely older than the Tommotian). Although much Early Cambrian time may be lost as a result of erosion at Random Formation–Bonavista Group unconformities, many Watsonella crosbyi Zone species reappear in the Sunnaginia imbricata Zone. Shoaling accompanied the immigration event defining the base of the Camenella baltica Zone, and an unconformity following regional offlap marks the top of the Placentian Series.

Calcareous, and not phosphatic, composition is most common in earliest Cambrian shelly remains. Little evidence suggests that a global, Precambrian–Cambrian boundary interval “phosphogenic” event either resulted in deposition of local phosphate deposits in the Tethyan region or had a role in the appearance of mineralized skeletons.

Twenty metazoans and problematica and an alga are illustrated from the Chapel Island Formation. Bemella? vonbitteri Landing n. sp. and Halkieria stonei Landing n. sp. are described. The monoplacophoran Archaeospira? avalonensis Landing n. sp. has right-and left-handed conchs comparable to those of Archaeospira (=Yangtzespira) from China. Anabarites is the senior generic synonym of Tiksitheca.



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Aigner, T. 1982. Calcareous tempestites: storm-dominated stratification in upper Muschelkalk Limestones (Middle Trias, SW-Germany), p. 180198. In Einsele, G. and Seilacher, A. (eds.), Cyclic and Event Sedimentation. Springer-Verlag, New York.
Alcock, F. J. 1938. Geology of Saint John region, New Brunswick. Geological Survey of Canada Memoir 216, 65 p.
Allen, J. R. L. 1986. Pedogenic calcretes in the Old Red Sandstone facies (Late Silurian-Early Carboniferous) of the Anglo-Welsh area, southern Britain, p. 5886. In Wright, V. P. (ed.), Paleosols: Their Recognition and Interpretation. Princeton University Press, Princeton, New Jersey.
Allen, P. M., and Jackson, A. A. 1978. Bryn-teg Borehole, North Wales. Bulletin of the Geological Survey of Great Britain, 61, 48 p.
Anderson, M. M. 1987. Stratigraphy of Cambrian rocks at Bacon Cove, Duffs, and Manuels River, Conception Bay, Avalon Peninsula, eastern Newfoundland. Geological Society of America Centennial Field Guide—Northeastern Section, p. 467472.
Bengtson, S. 1976. The structure of some Middle Cambrian conodonts and the early evolution of conodont structure and function. Lethaia, 9:185206.
Bengtson, S., and Conway Morris, S. 1984. Comparative study of Lower Cambrian Halkieria and Middle Cambrian Wiwaxia . Lethaia, 17:305329.
Bengtson, S., and Fletcher, T. P. 1983. The oldest sequence of skeletal fossils in the Lower Cambrian of southeastern Newfoundland. Canadian Journal of Earth Sciences, 20:525536.
Benus, A. P. 1988. Sedimentological context of a deep-water Ediacaran fauna (Mistaken Point Formation, Avalon Zone, eastern Newfoundland), p. 89. In Landing, E., Narbonne, G. M., and Myrow, P. (eds.), Trace Fossils, Small Shelly Fossils and the Precambrian–Cambrian Boundary. New York State Museum Bulletin 463.
Benus, A. P., and Landing, E. 1984. Depositional environments and biofacies of the Bonavista Formation (Early Cambrian, eastern Newfoundland). Geological Society of America, Abstracts with Programs, 16:3.
Berner, R. A. 1980. Early Diagenesis: A Theoretical Approach. Princeton University Press, Princeton, New Jersey, 241 p.
Billings, E. 1872. On some fossils from the Primordial rocks of Newfoundland. The Canadian Naturalist, 6:465479.
Brasier, M. 1979. The Cambrian radiation event, p. 103159. In House, M. R. (ed.), The Origin of Major Invertebrate Groups. The Systematics Association Special Vol. 12, Academic Press, New York.
Brasier, M. 1980. The Lower Cambrian transgression and glauconite–phosphate facies in western Europe. Journal of the Geological Society of London, 137:695703.
Brasier, M. 1982. Sea-level changes, facies changes and the late Precambrian–Early Cambrian evolutionary explosion. Precambrian Research, 17:105132.
Brasier, M. 1984. Microfossils and small shelly fossils from the Lower Cambrian Hyolithes Limestone at Nuneaton, English Midlands. Geological Magazine, 121:229253.
Brasier, M. 1985. Evolutionary and geological events across the Precambrian–Cambrian boundary. Geology Today, 1:141146.
Brasier, M. 1986a. The succession of small shelly fossils (especially conoidal microfossils) from English Precambrian–Cambrian boundary beds. Geological Magazine, 123:237256.
Brasier, M. 1986b. Precambrian–Cambrian boundary biotas and events, p. 109117. In Walliser, O. H. (ed.), Global Bio-Events. Lecture Notes in Earth Sciences 8, Springer-Verlag, New York.
Brasier, M., and Hewitt, R. A. 1979. Environmental setting of fossiliferous rocks from the uppermost Proterozoic–Lower Cambrian of central England. Palaeogeography, Palaeoclimatology, Palaeoecology, 27:3557.
Brasier, M., and Singh, P. 1987. Microfossils and Precambrian–Cambrian boundary stratigraphy at Maldeota, Lesser Himalaya. Geological Magazine, 124:323345.
Brewer, R. 1964. Fabric and Mineral Analysis of Soils. John Wiley & Sons, New York, 470 p.
Chen, P., and Zhang, F. 1980. Small shelly fossil assemblage from the Meishucunian Stage of Yunnan. Wuhan College of Geology Studies, 26:190197.
Cobbold, E. S. 1919. Cambrian Hyolithidae, etc., from the Hartshill in the Nuneaton district, Warwickshire. Geological Magazine, 6:149158.
Cobbold, E. S. 1921. The Cambrian horizons of Comley (Shropshire) and their Brachiopoda, Pteropoda, Gasteropoda, etc. Quarterly Journal of the Geological Society of London, 76:325386.
Cobbold, E. S. 1935. Lower Cambrian faunas from Hérault, France. The Annals and Magazine of Natural History, 16(91):2548.
Cohee, G. V. 1970. Generally recognized European stages. American Association of Petroleum Geologists Advisory Committee on Stratigraphic Coding, 27 p.
Conway Morris, S. 1987. The search for the Precambrian–Cambrian boundary. American Scientist, 75:156167.
Cook, P. J., and Shergold, J. H. 1984. Phosphorus, phosphorites and skeletal evolution at the Precambrian–Cambrian boundary. Nature, 308:231236.
Cowie, J. W., and Rozanov, A. Yu. 1974. I.U.G.S. Precambrian/ Cambrian Boundary Working Group in Siberia, 1973. Geological Magazine, 111:237252.
Cowie, J. W., Rushton, A. W. A., and Stubblefield, C. J. 1972. A correlation of Cambrian rocks in the British Isles. Special Report of the Geological Society of London, 2, 56 p.
Crimes, T. P., and Anderson, M. M. 1985. Trace fossils from late Precambrian–Early Cambrian strata of southeastern Newfoundland (Canada): temporal and environmental implications. Journal of Paleontology, 59:310343.
Culver, S. J., Pojeta, J. Jr., and Repetski, J. E. 1988. First record of Early Cambrian shelly microfossils from west Africa. Geology, 16:596599.
Dick, V. B., and Brett, C. E. 1985. Petrology, taphonomy and sedimentary environments of pyritic fossil beds from the Hamilton Group (Middle Devonian) of western New York, p. 102128. In Brett, C. E. (ed.), Dynamic Stratigraphy and Depositional Environments of the Hamilton Group (Middle Devonian) in New York State, Part I. New York State Museum Bulletin 457.
Eckert, B., and Brett, C. E. In press. Bathymetry and paleoecology of Silurian benthic assemblages, Late Llandoverian, New York State. Palaeogeography, Palaeoclimatology, Palaeoecology.
Eichwald, E. von. 1860. Lethaea rossica ou paleontologie de la Russie. E. Schweitzerbart, Stuttgart, 1,657 p.
Fedonkin, M. 1988. Paleoichnology of the Precambrian–Cambrian transition in the Russian Platform and Siberia, p. 12. In Landing, E., Narbonne, G. M., and Myrow, P. (eds.), Trace Fossils, Small Shelly Fossils and the Precambrian–Cambrian Boundary. New York State Museum Bulletin 463.
Fedonkin, M., Gnilovskaya, M. B., Jankauskas, T. V., Kirjanov, V. V., Lendzion, K., Mierzejewska, G., Palu, V. M., Paskeviciene, L. T., Piskun, L. V., Posti, E., Rozanov, A. Yu., Urbanek, A., and Volkova, N. A. 1983. Upper Precambrian and Cambrian Paleontology of the East-European Platform. Publishing House Wydawnictwa Geologiczne Warszawa, 158 p.
Fletcher, T. P. 1972. Geology and Lower to Middle Cambrian trilobite faunas of southeast Avalon, Newfoundland. Unpubl. Ph.D. dissertation, University of Cambridge, Cambridge, United Kingdom, 472 p.
Glaessner, M. F. 1984. The Dawn of Animal Life. Cambridge University Press, New York, 244 p.
Gnilovskaya, M. B. 1971. The oldest Vendian aquatic plants from the Russian Platform. Paleontological Journal, 3:325332.
Golubev, S. N. 1976. Ontogeneticheskie izmyenyeniya i evolyotsinnye tendentsiy rannekembriaskich spiralinich gastropod Pelagiellacea. Paleontologicheskii Zhurnal, 51:3440.
Grabau, A. W. 1900. Palaeontology of the Cambrian terranes of the Boston Basin. Occasional Papers of the Boston Society of Natural History, 4:601694.
Grabau, A. W., and Shimer, H. W. 1909. North American Index Fossils-Invertebrates, Volume 1. A. G. Seiler & Co., New York, 853 p.
Groom, T. 1902. The sequence of the Cambrian and associated beds of the Malvern Hills. Quarterly Journal of the Geological Society of London, 58:89135.
Hakes, W. G. 1976. Trace fossils and depositional environment of four clastic units, Upper Pennsylvanian megacyclothems, northeast Kansas. University of Kansas Paleontological Contributions, 63, 46 p.
Hall, J. 1847. Palaeontology of New York, Volume 1. C. van Benthuysen, Albany, 338 p.
Haq, B. U., and Van Eysinga, F. W. B. 1987. Geological Time Scale, fourth edition. Elsevier Science Publishing Company, New York.
Harland, W. B., Cox, A. V., Llewellyn, P. G., Picton, C. A. G., Smith, A. G., and Walters, R. 1982. A Geologic Time Scale. Cambridge University Press, 131 p.
Hayes, A. O., and Howell, B. J. 1937. Geology of the Saint John, New Brunswick. Geological Society of America Special Paper 5, 146 p.
He, T.-G. 1981. Lower Cambrian (Meishucunian) sachitids and their stratigraphic significance. Chendu Dizhi Xueyuan Xiebao, 2:8490 (in Chinese).
He, T.-G., and Yang, X.-H. 1982. Lower Cambrian Meishucun Stage of the western Yangtze stratigraphic region and its small shelly fossils. Bulletin of the Chendu Institute of Geology and Mineral Resources, Chinese Academy of Geological Sciences, 3:6995 (in Chinese).
Hedberg, H. D. 1972. Introduction to an international stratigraphic classification, terminology, and usage. Lethaia, 5:285295.
Hinz, I. 1987. The Lower Cambrian microfauna of Comley and Rushton, Shropshire/England. Palaeontographica Abteilung, 198:41100.
Hiscott, R. N. 1982. Tidal deposits of the Lower Cambrian Random Formation, eastern Newfoundland: facies and paleoenvironments. Canadian Journal of Earth Sciences, 19:20282046.
Holl, H. B. 1865. On the geological structure of the Malvern Hills and adjacent districts. Quarterly Journal of the Geological Society of London, 21:72108.
Holm, G. 1893. Sveriges Kambrisk–Siluriska Hyolithidae och Conularidae. Sveriges Geologiska Undersökning, Aflandlingar och Uppsater, 112, 172 p.
Hutchinson, R. D. 1952. The stratigraphy and trilobite faunas of the Cambrian sedimentary rocks of Cape Breton Island, Nova Scotia. Geological Survey of Canada Memoir 263, 124 p.
Hutchinson, R. D. 1962. Cambrian stratigraphy and trilobite faunas of southeastern Newfoundland. Geological Society of America Bulletin 88, 156 p.
Jablonski, D., and Bottjer, D. J. 1983. Soft-bottom epifaunal suspension-feeding assemblages in the Late Cretaceous, p. 747812. In Tevesz, M. J. S. and McCall, P. L. (eds.), Biotic Interactions in Recent and Fossil Benthic Communities. Plenum Press, New York.
Jablonski, D., Sepkoski, J. J. Jr., Bottjer, D. J., and Sheehan, P. M. 1983. Onshore-offshore patterns in the evolution of Phanerozoic shelf communities. Science, 222:11231125.
Jiang, Z.-W. 1980. Monoplacophorans and gastropods fauna [sic] of the Meishucun Stage from the Meichucun region, Yunnan. Acta Geologica Sinica, 54:112123 (in Chinese with English summary).
Kerber, M. 1988. Mikrofossilien aus Unterkambrischen Gesteinen der Montagne Noire, Frankreich. Paläontographica Abteilung A, 202:127203.
King, A. F. 1979. The birth of the Caledonides: late Precambrian rocks of the Avalon Peninsula, Newfoundland, and their correlatives in the Appalachian Orogen, p. 39. In Wones, D. R. (ed.), The Caledonides in the USA. Virginia Polytechnic Institute and State University, Blacksburg, Memoir 3.
Landing, E. 1984. Skeleton of lapworthellids and the suprageneric classification of tommotiids (Early and Middle Cambrian phosphatic problematica). Journal of Paleontology, 58:13801398.
Landing, E. 1988a. Bioturbation and infaunal diversity, Lower Cambrian, southeastern Newfoundland. Geological Society of America, Abstracts with Programs, 20:31.
Landing, E. 1988b. Trace fossils, small shelly fossils and the Precambrian-Cambrian boundary: a pre-meeting viewpoint, p. 13. In Landing, E., Narbonne, G. M., and Myrow, P. (eds.), Trace Fossils, Small Shelly Fossils and the Precambrian–Cambrian Boundary. New York State Museum Bulletin 463.
Landing, E. 1988c. Lower Cambrian of eastern Massachusetts: stratigraphy and small shelly fossils. Journal of Paleontology, 62:661695.
Landing, E. 1988d. Depositional tectonics and biostratigraphy of the western portion of the Taconic allochthon, eastern New York State, p. 96110. In Landing, E. (ed.), The Canadian Paleontology and Biostratigraphy Seminar. New York State Museum Bulletin 462.
Landing, E. 1989. Paleoecology and distribution of the Early Cambrian rostroconch Watsonella crosbyi Grabau. Journal of Paleontology, 63:566573.
Landing, E., and Benus, A. P. 1984. Lithofacies belts of the Smith Point Limestone (Lower Cambrian, southeastern Newfoundland) and the lowest occurrence of trilobites. Geological Society of America, Abstracts with Programs, 16:45.
Landing, E., and Benus, A. P. 1988a. Cambrian depositional history and stratigraphy, Avalon–Bonavista region, southeastern Newfoundland, 50 p. In Davenport, P. H., Hiscott, R. N., O'Neill, P. P., and Nolan, L. W. (eds.), Geological Association of Canada Annual Meeting, Field Trip Guidebook, Trip A3. Geological Association of Canada, Newfoundland Section, St. John's.
Landing, E., and Benus, A. P. 1988b. Stratigraphy of the Bonavista Group, southeastern Newfoundland: growth faults and the distribution of the sub-trilobitic Lower Cambrian, p. 5971. In Landing, E., Narbonne, G. M., and Myrow, P. (eds.), Trace Fossils, Small Shelly Fossils and the Precambrian–Cambrian Boundary. New York State Museum Bulletin 463.
Landing, E., Narbonne, G. M., Myrow, P., Benus, A. P., and Anderson, M. M. 1988. Faunas and depositional environments of the Upper Precambrian through Lower Cambrian, southeastern Newfoundland, p. 1852. In Landing, E., Narbonne, G. M., and Myrow, P. (eds.), Trace Fossils, Small Shelly Fossils and the Precambrian–Cambrian Boundary. New York State Museum Bulletin 463.
Landing, E., Narbonne, G. M., Myrow, P., Benus, A. P., Nowlan, G. S., and Fletcher, T. P. 1980. A microfauna associated with Early Cambrian trilobites of the Callavia zone, northern Antigonish Highlands, Nova Scotia. Canadian Journal of Earth Sciences, 17:400418.
Linnarsson, J. G. O. 1871. Om några försteningar från Sveriges och Norges ‘Primordialzon.’ Ofversigt af Konglische Vetenskaps-Akademiens Förhandlingar, 6:789796.
Luo, H., Jiang, X., Wu, X., Song, X., Ouyang, L., et al. 1982. The Sinian Cambrian Boundary in eastern Yunnan, China. Yunnan Institute of Geological Sciences, The People's Publishing House, Yunnan, 265 p. (in Chinese with English summary).
Luo, H., Jiang, X., Wu, X., Song, X., Ouyang, L., et al. Xing, Y. Liu, G., Zang, S., and Tao, Y. 1984. Sinian–Cambrian Boundary Stratotype at Meishucun, Jinning, Yunnan, China. The People's Publishing House, Yunnan, 154 p.
Matthew, G. F. 1889. On Cambrian organisms in Acadia. Transactions of the Royal Society of Canada, 7(4):135162.
Matthew, G. F. 1899a. A Palaeozoic terrane beneath the Cambrian. Annals of the New York Academy of Sciences, 12:4156.
Matthew, G. F. 1899b. The Etcheminian fauna of Smith Sound, Newfoundland. Transactions of the Royal Society of Canada 5(4):97119.
Matthew, G. F. 1899c. Preliminary notice of the Etcheminian fauna of Newfoundland. Bulletin of the Natural Historical Society of New Brunswick, 18:189196 (issued in 1902).
Matthew, G. F. 1900. Mr. Walcott's view of the Etcheminian. American Geologist, 25:255258.
Matthew, G. F. 1903. Report on the Cambrian rocks of Cape Breton. Geological Survey of Canada, Report No. 797, 246 p.
Matthew, G. F. 1912. The sudden appearance of the Cambrian fauna. 11th International Geological Congress, Stockholm, 1:547559.
Matthew, G. F. 1914. The physics of the Cambrian formation in eastern Canada and the pecularities of its faunas. Transactions of the Royal Society of Canada, 3rd Series, 8(4):6985 (issued in 1915).
Matthews, S. C., and Missarzhevsky, V. V. 1975. Small shelly fossils of late Precambrian and Early Cambrian age. Journal of the Geological Society of London, 131:289304.
Missarzhevsky, V. V. 1973. Konodontoobraznie organizma iz pogranichnykh sloev Kembriya i Dokembriya Sibirskoy Platformi i Kazakstana, p. 5358. In Problemi Paleontologii i Biostratigrafiya nizhnego Kembriya Sibiri i Dal'nego Vostoka. “Nauka,” Novosibirsk.
Missarzhevsky, V. V. 1983. Stratigrafiya dreveneyshikh tolshch Phanerozoya Anabarskogo Massiva. Sovetskaya Geologiya, 9:6273.
Moczydlowska, M., and Vidal, G. 1988. How old is the Tommotian? Geology, 16:166168.
Mount, J. F., and Signor, P. W. 1985. Early Cambrian innovation in shallow subtidal environments: paleoenvironments of Early Cambrian shelly fossils. Geology, 13:730733.
Müller, K. J. 1959. Kambrische Conodonten. Deutsche Geologische Gesellschaftung Zeitschrift, 111:434485.
Müller, K. J. 1975. “Heraultia” varensalensis (Cobbold) aus dem Unteren Kambrium, des ältesten Fall von Geschlechtsdimorphismus. Paläontologisches Zeitschrift, 49:168180.
Myrow, P. 1987. Sedimentology and depositional history of the Chapel Island Formation (late Precambrian to Early Cambrian), southeast Newfoundland. Unpublished Ph.D. dissertation, Memorial University of Newfoundland, St. John's, 509 p.
Müller, K. J., Narbonne, G. M., and Hiscott, R. N. 1988. Storm-shelf and tidal deposits of the Chapel Island and Random Formations, Burin Peninsula: fades and trace fossils, 105 p. In Davenport, P. H., Hiscott, R. N., O'Neill, P. P., and Nolan, L. W. (eds.), Geological Association of Canada Annual Meeting, Field Trip Guidebook, Trip B6. Geological Association of Canada, Newfoundland Section, St. John's.
Nagle, J. S. 1967. Wave and current orientation of shells. Journal of Sedimentary Petrology, 57:11241138.
Narbonne, G. M., and Myrow, P. 1988. Trace fossil biostratigraphy in the Precambrian–Cambrian boundary interval, p. 7276. In Landing, E., Narbonne, G. M., and Myrow, P. (eds.), Trace Fossils, Small Shelly Fossils and the Precambrian–Cambrian Boundary. New York State Museum Bulletin 463.
Narbonne, G. M., and Landing, E. In press. Soft-bodied metazoans from the Lower Cambrian of the Burin Peninsula, Newfoundland. Journal of Paleontology.
Narbonne, G. M., and Landing, E., and Anderson, M. M. 1987. A candidate stratotype for the Precambrian–Cambrian boundary, Fortune Head, Burin Peninsula, southeastern Newfoundland. Canadian Journal of Earth Sciences, 24:12771293.
North American Commission on Stratigraphic Nomenclature. 1983. North American Stratigraphic Code. American Association of Petroleum Geologists Bulletin, 67:841875.
Öpik, A. 1926. Über estlandischen blauen Ton. Sitzungbergiana Naturforschung, Gesellschaft der Universität Tartu, 3:157.
Orbigny, A.D.' 1850. Paléontologie française, terrains jurassiques, Vol. 2. Paris, 621 p.
Pojeta, J. Jr., and Runnegar, B. 1976. The paleontology of rostroconch mollusks and the early history of the phylum Mollusca. U.S. Geological Survey Professional Paper 968, 88 p.
Poulsen, C. 1967. Fossils from the Lower Cambrian of Bornholm. Det Kongelige Danske Videnskabernes Selskab Matematisk-Fysiske Meddelelser, 36(2), 49 p.
Rast, N., O'Brien, B. H., and Wardle, R. F. J. 1976. Relationships between Precambrian and lower Palaeozoic rocks of the ‘Avalon Platform’ in New Brunswick, the northeast Appalachians and the British Isles. Tectonophysics, 30:315338.
Robison, R. A., and Rowell, A. J. (eds.). 1983. Paleontology and depositional environments. Cambrian of western North America. Brigham Young University Geology Studies, 23, 227 p.
Rozanov, A. Yu., and Missarzhevsky, V. V. 1966. Biostratigrafiya i fauna nizhnich gorozontov Kembriya. Akademiya Nauk SSSR, Geologicheskii Institut, Trudy 148, Izdatel'stvo “Nauka,” Moscow, 126 p.
Narbonne, G. M., and Landing, E. Valkova, N. A., Voronova, L. C., Krylov, I. N., Keller, B. M., Korolyuk, I. K., Lendzion, K., Michniak, R., Pykhova, N. G., and Sidarov, A. D. 1969. Tommotskii yarus i problema nizhnej granitsky Kembriya. Akademiya Nauk SSSR, Ordena Trudovogo Krasnogo Zhumeni Geologicheskii Institut, 206, “Nauka,” Moscow, 359 p.
Runnegar, B. 1983. Molluscan phylogeny revisited. Memoirs of the Association of Australian Paleontologists, 1:121144.
Runnegar, B., and Jell, P. A. 1976. Australian Middle Cambrian mollusks and their bearing on Early Cambrian molluscan evolution. Alcheringa, 1:109138.
Runnegar, B., and Pojeta, J. Jr. 1985. Origin and diversification of the Mollusca, p. 157. In Trueman, E. R. and Clarke, M. R. (eds.), The Mollusca, Vol. 10, Evolution. Academic Press, New York.
Rushton, A. W. A. 1974. The Cambrian of Wales and England, p. 43121. In Holland, C. H. (ed.), Cambrian of the British Isles, Norden, and Spitsbergen. John Wiley & Sons, New York.
Shaler, N. S., and Foerste, A. F. 1888. Preliminary description of North Attleboro fossils. Harvard Museum of Comparative Zoology Bulletin, 16:2741.
Shergold, J., and Brasier, M. 1987. Proterozoic and Cambrian phosphorites—Specialist studies: biochronology of Proterozoic and Cambrian phosphorites, p. 295326. In Cook, P. J. and Shergold, J. H. (eds.), Phosphate Deposits of the World, Volume 1. C. U. P.
Singh, P., and Shukla, D. S. 1981. Fossils from the Lower Tal: their age and its bearing on the stratigraphy of Lesser Himalaya. Geoscience Journal, 11:157176.
Smith, S. A., and Hiscott, R. N. 1984. Latest Precambrian to Early Cambrian basin evolution, Fortune Bay, Newfoundland: fault-bounded basin to platform. Canadian Journal of Earth Sciences, 21:13791392.
Sokolov, B. S. and Zhuravleva, I. T. 1983. Yarosnoe rasolenie Nizhnego Kembriya Sibiri—Atlas okamenelostey. Izdatel'stvo “Nauka,” Moscow, 216 p.
Strauch, F. 1968. Determination of Cenozoic sea-temperatures using Hiatella arctica (Linné). Palaeogeography, Palaeoclimatology, Palaeoecology, 5:213233.
Vail, P. R., Mitchum, R. M., and Thompsom, S. III. 1977. Seismic stratigraphy and global changes of sea level, Part 3: Relative changes of sea level from coastal onlap, p. 6381. In Payton, E. (ed.), Seismic Stratigraphy—Applications to Hydrocarbon Exploration. American Association of Petroleum Geologists, Memoir 26.
Valentine, J. W. 1973. Evolutionary Paleoecology of the Marine Biosphere. Prentice Hall, Inc., Englewood Cliffs, New Jersey, 511 p.
Valkov, A. K. 1982. Biostratigrafiya nizhnego Kembriya Vostoka Sibirskoy Platformy (Ochoro-Maysky rayon). Izdatel'stvo “Nauka,” Moscow, 91 p.
Voronova, L. G., and Missarzhevsky, V. V. 1969. Nakhodi vodorosley i trubok chervey v pogranichnikh sloyakh Kembriya i Dokembriya na severe Sibirskoy Platformy. Doklady Akademii Nauk SSSR, 184:207210.
Vostokova, V. A. 1962. Kembriiskie gastropody Sibirskoy Platformy i Taimyra. Statei po Paleontologii i Biostratigrafii, 28:5174.
Walcott, C. D. 1889a. Descriptive notes on new genera and species from the Lower Cambrian or Olenellus Zone of North America. Proceedings of the U.S. National Museum, 12:3346.
Walcott, C. D. 1889b. Stratigraphic position of the Olenellus fauna in North America and Europe. American Journal of Science, 3rd Series, 37:374392.
Walcott, C. D. 1890. The fauna of the Lower Cambrian or Olenellus Zone of North America. 10th Annual Report of the U.S. Geological Survey, 574 p.
Walcott, C. D. 1900. Lower Cambrian terrane in the Atlantic Province. Proceedings of the Washington Academy of Sciences, 1:301339.
Walcott, C. D. 1912. Cambrian Brachiopods. U.S. Geological Survey Monograph 60, 1,235 p.
Walliser, O. H. 1958. Rhombocorniculum comleyensis n. gen. n. sp. (Incertae sedis, Unterkambrium, Shropshire). Paläontologisches Zeitschrift, 32:176180.
Williams, A., and Rickards, B. 1984. Paleoecology of graptolitic black shales, p. 159166. In Bruton, D. (ed.), Aspects of the Ordovician System. Paleontology Contributions of the University of Oslo, 295.
Williams, H., and Hatcher, R. D. Jr. 1982. Suspect terranes and accretionary history of the Appalachian orogen. Geology, 10:530536.
Xing, Y., Ding, Q., Luo, H., He, P., Wang, Y., et al. 1983. The Sinian–Cambrian boundary of China. Bulletin of the Institute of Geology, Chinese Academy of Geological Sciences, No. 10. Geological Publishing House, Beijing, 262 p. (in Chinese with English summary).
Xing, Y., Ding, Q., Luo, H., He, P., Wang, Y., et al., and Luo, H. 1984. Precambrian–Cambrian boundary candidate, Meishucun, Jinning, Yunnan, China. Geological Magazine, 121:143154.
Yanichevsky, M. 1926. Ob ostatkakh trubchatykh chervey iz Kembriyskoy siney gliny. Paleontologiskogo Obshtchestvo Rossiya, 4:99111.
Yin, J. C., Ding, L.-F., He, T.-G., Li, S.-L., and Shen, L.-N. 1980. The Stratigraphy, Palaeontology and Sedimentary Environment of the Sinian System in Emei and Ganluo, Sichuan. The Sichuan People's Publishing House, 57 p. (in Chinese).
Yu, W. 1974. Cambrian Gastropoda, p. 113. In A Handbook of the Stratigraphy and Palaeontology of Southwest China. Science Press, Beijing (in Chinese).
Yu, W. 1979. Earliest Cambrian monoplacophorans and gastropods from W. Hubei and E. Yunnan. Acta Palaeontologica Sinica, 18:233270 (in Chinese with English summary).
Yu, W. 1984. Early Cambrian molluscan faunas of Meishucun Stage with special references to Precambrian–Cambrian boundary. Academica Sinica Developments in Geosciences, Contributions to 27th International Geological Congress, Science Press, Beijing, p. 2135.
Yu, W. 1987. Yangtze micromolluscan fauna in Yangtze region of China with notes on Precambrian–Cambrian boundary. Stratigraphy and Paleontology of Systematic Boundaries in China, 1:19275.


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