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Burgess Shale-type preservation of both non-mineralizing and ‘shelly’ Cambrian organisms from the Mackenzie Mountains, northwestern Canada

  • N. J. Butterfield (a1) and C. J. Nicholas (a2)
Abstract

Lower to Middle Cambrian shales of the Mount Cap Formation in the Mackenzie Mountains, northwestern Canada, host a variety of Burgess Shale-type macrofossils, including anomalocarid claws, several taxa of bivalved arthropod, articulated hyolithids, and articulated chancelloriids. Hydrofluoric acid processing has also yielded a broad range of organic-walled fossils, most of which are derived from forms more typically known as shelly fossils; e.g., trilobites, inarticulate brachiopods, small shelly fossils (SSF), hyolithids, and chancelloriids. Organic-walled hyolithids include conchs, opercula and helens; the proximal articulation of the helens is erosive, suggesting that they were formed “instantaneously” and periodically replaced. Organic-walled chancelloriid sclerites exhibit a polygonal surface texture and an inner “pith” of dark granular material with distally oriented conoidal divisions; such a pattern is similar to that seen in the fibers of some modern horny sponges and points to a poriferan relationship for the chancelloriids. The robust nature but minimal relief of most of these fossils suggests that primary biomineralization was minimal.

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Aitken, J. D., Macqueen, R. W., and Usher, J. L. 1973. Reconnaissance studies of Proterozoic and Cambrian stratigraphy, lower Mackenzie River area (Operation Norman), District of Mackenzie. Geological Survey of Canada, Paper, 73-9, 178 p.
Babcock, L. E., and Robison, R. A. 1988. Taxonomy and paleobiology of some Middle Cambrian Scenella (Cnidaria) and hyolithids (Mollusca) from western North America. University of Kansas Paleontological Contributions Paper, 121, 22 p.
Bengtson, S. 1992. The cap-shaped Cambrian fossil Maikhanella and the relationship between coeloscleritophorans and molluscs. Lethaia, 25:401420.
Bengtson, S., Conway Morris, S., Cooper, B. J., Jell, P. A., and Runnegar, B. N. 1990. Early Cambrian fossils from South Australia. Association of Australasian Palaeontologists Memoir, 9, 364 p.
Bengtson, S., and Missarzhevsky, V. V. 1981. Coeloscleritophora—a major group of enigmatic Cambrian metazoans, p. 1921. In Taylor, M. E. (ed.), Short Papers for the Second International Symposium on the Cambrian System. United States Geological Survey Open File Report, 81-743.
Bergquist, P. R. 1978. Sponges. Hutchinson, London, 268 p.
Brasier, M. D. 1992. Paleoceanography and changes in the biological cycling of phosphorous across the Precambrian-Cambrian boundary, p. 483523. In Lipps, J. H. and Signor, P. W. (eds.), Origin and Early Evolution of the Metazoa. Plenum Press, New York.
Briggs, D. E. G. 1979. Anomalocaris, the largest known Cambrian arthropod. Palaeontology, 22:631664.
Brusca, R. C., and Brusca, G. J. 1990. Invertebrates. Sinauer, Sunderland, Massachusetts, 922 p.
Butterfield, N. J. 1990a. Organic preservation of non-mineralizing organisms and the taphonomy of the Burgess Shale. Paleobiology, 16:272286.
Butterfield, N. J. 1990b. A reassessment of the enigmatic Burgess Shale fossil Wiwaxia corrugata (Matthew) and its relationship to the polychaete Canadia spinosa Walcott. Paleobiology, 16:287303.
Butterfield, N. J. 1994. Burgess Shale-type fossils from a Lower Cambrian shallow-shelf sequence in northwestern Canada. Nature, 369:477479.
Butterfield, N. J. 1995. Secular distribution of Burgess Shale-type preservation. Lethaia, 28:113.
Carter, H. H. 1872. Description, with illustrations, of a new species of Aplysina from the N.W. coast of Spain. Annals and Magazine of Natural History, Series 4, 10:101110.
Carter, H. H. 1881. On the development of the fibre in the Spongida. Annals and Magazine of Natural History, Series 5, 8:112120.
Conway Morris, S. 1986. The community structure of the Middle Cambrian Phyllopod Bed (Burgess Shale). Palaeontology, 29:423467.
Conway Morris, S., and Peel, J. S. 1995. Articulated halkieriids from the Lower Cambrian of North Greenland and their role in early protostome evolution. Philosophical Transactions of the Royal Society of London B, 347:305358.
Dzik, J. 1980. Ontogeny of Bactrotheca and related hyoliths. Geologiska Föreningens i Stockholm Förhandlingar, 102:223233.
Harris, T. M. 1974. Williamsoniella lignieri: its pollen and the compression of spherical pollen grains. Palaeontology, 17:125148.
Hinz, I. 1987. The Lower Cambrian microfauna of Comley and Rushton, Shropshire/England. Palaeontographica Abteilung A, 198:41100.
Holmer, L. 1989. Middle Ordovician phosphatic inarticulate brachiopods from Västergötland and Dalarna, Sweden. Fossils and Strata, 26, 172 p.
Marek, L., and Yochelson, E. L. 1976. Aspects of the biology of Hyolitha (Mollusca). Lethaia, 9:6582.
Müller, F. 1865. Ueber Darwinella aurea, einen Schwamm mit sternförmigen Hornnadeln. Archiv für Mikroskopische Anatomie, 1:344353.
Pugh, D. C. 1993. Subsurface geology of pre-Mesozoic strata, Great Bear River map area, District of Mackenzie. Geological Survey of Canada Memoir, 430, 137 p.
Runnegar, B. 1980. Hyolitha: status of the phylum. Lethaia, 13:2125.
Runnegar, B., Pojeta, J., Morris, N. J., Taylor, J. D., Taylor, M. E., and McClung, G. 1975. Biology of the Hyolitha. Lethaia, 8:181191.
Salvini-Plawen, L. v. 1988. The structure and function of molluscan digestive systems, p. 301379. In Trueman, E. R. and Clarke, M. R. (eds.), The Mollusca, volume 11, Form and Function. Academic Press, San Diego.
Simpson, T. L. 1984. The Cell Biology of Sponges. Springer-Verlag, New York, 662 p.
Towe, K. M., and Rützler, K. 1968. Lepidocrocite iron mineralization in keratose sponge granules. Science, 162:268269.
Vacelet, J. 1971a. Ultrastructure et formation des fibres de spongine d'éponges cornées Verongia. Journal de Microscopie (France), 10:1332.
Vacelet, J. 1971b. L'ultrastructure de la cuticle d'éponges cornées du genre Verongia. Journal de Microscopie (France), 10:113116.
Walcott, C. D. 1920. Cambrian geology and paleontology IV, No. 6.-Middle Cambrian Spongiae. Smithsonian Miscellaneous Collections, 67:261364.
Whittington, H. B. 1975. Trilobites with appendages from the Middle Cambrian Burgess Shale, British Columbia. Fossils and Strata, 4:97136.
Williams, A., Mackay, S., and Cusack, M. 1992. Structure of the organo-phosphatic shell of the brachiopod Discina. Philosophical Transactions of the Royal Society of London B, 337:83104.
Yochelson, E. L. 1961. The operculum and mode of life of Hyolithes. Journal of Paleontology, 35:152161.
Yochelson, E. L. 1974. Redescription of the Early Cambrian Helenia bella Walcott, an appendage of Hyolithes. United States Geological Survey, Journal of Research, 2:717722.
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Journal of Paleontology
  • ISSN: 0022-3360
  • EISSN: 1937-2337
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