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2003 | 48 | 3 |
Tytuł artykułu

Upper Cambrian trilobite biostratigraphy and taphonomy at Kakeled on Kinnekulle, Vastergotland, Sweden

Autorzy
Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
A section through the Upper Cambrian black shales and limestones at Kakeled on Kinnekulle, Västergötland, Sweden, extends from the lower–middle part of the Agnostus pisiformis Zone into the Peltura scarabaeoides Zone. Fossils are usually preserved only in the stinkstones, but in the A. pisiformis Zone trilobites can be found also in the shales. Lithologically, the stinkstones can be subdivided into primary coquinoid limestone, which include the majority of the fossils, and early diagenetically formed limestone. The orientation of cephala and pygidia of A. pisiformis were measured on four shale surfaces and one stinkstone surface. The majority of the shields were deposited with the convex side up and showed a preferred orientation, suggesting that their positions were affected by currents. Above the A. pisiformis Zone the section comprises the Olenus/Homagnostus obesus Zone (0.30 m), the upper part of the Parabolina spinulosa Zone (0.05 m), the Peltura minor Zone (1.15 m), and the Peltura scarabaeoides Zone (2.50 m). The Leptoplastus and Protopeltura praecursor zones are missing. The Olenus/H. obesus Zone is represented only by the O. gibbosus and O. wahlenbergi subzones, whereas the O. truncatus, O. attenuatus, O. dentatus, and O. scanicus subzones are missing.
Wydawca
-
Rocznik
Tom
48
Numer
3
Opis fizyczny
p.409-416,fig.
Twórcy
autor
  • GeoBiosphere Science Centre, Solvegatan 12, SE-223 62 Lund, Sweden
Bibliografia
  • Ahlberg, P. (ed.) 1998. Guide to excursions in Scania and Västergötland, southern Sweden. IV Field Conference of the Cambrian Stage Subdivision Working Group. International Subcommission on Cambrian Stratigraphy. Sweden, 24–31 August 1998. Lund Publications in Geology 141: 1–47.
  • Ahlberg, P. and Ahlgren, J. 1996. Agnostids from the Upper Cambrian of Västergötland, Sweden. GFF 118: 129–140.
  • Andersson, A., Dahlman, B., Gee, D.G., and Snäll, S. 1985. The Scandinavian alum shales. Sveriges Geologiska Undersökning Ca 56: 1–50.
  • Bergström, J. and Gee, D.G. 1985. The Cambrian in Scandinavia. In: D.G. Gee and B.A. Sturt (eds.), The Caledonide Orogen—Scandinavia and Related Areas, 247–271. John Wiley & Sons, New York.
  • Buchardt, B., Nielsen, A.T., and Schovsbo, N.H. 1997. Alun Skiferen i Skandinavien. Geologisk Tidsskrift 1997 (3): 1–30.
  • Dworatzek, M. 1987. Sedimentology and petrology of carbonate intercalations in the Upper Cambrian Olenid shale facies of southern Sweden. Sveriges Geologiska Undersökning C 819: 1–73.
  • Eklöf, J., Rydell, J., Fröjmark, J., Johansson, M., and Seilacher, A. 1999. Orientation of agnostid shields in Alum Shale (Upper Cambrian): Implications for the depositional environment. GFF 121: 301–306.
  • Henningsmoen, G. 1957. The trilobite family Olenidae with description of Norwegian material and remarks on the Olenid and Tremadocian Series. Skrifter utgitt av Det Norske Videnskaps−Akademi i Oslo, I. Matematisk−Naturvidenskapelig Klasse 1957 (1): 1–303.
  • Henningsmoen, G. 1974. A comment. Origin of limestone nodules in the Lower Palaeozoic of the Oslo Region. Norsk Geologisk Tidsskrift 54: 401–412.
  • Linnarsson, J.G.O. 1868. Bidrag till Westergötlands geologi. Öfversigt af Kongliga Vetenskaps−Akademiens Förhandlingar 1868 (1): 53–61.
  • Nagle, J.S. 1967. Wave and current orientation of shells. Journal of Sedimentary Petrology 37: 1124–1138.
  • Nathorst, A.G. 1869. Om lagerföljden inom kambriska formationen vid Andrarum i Skåne. Öfversigt af Kongliga Vetenskaps−Akademiens Förhandlingar 1869 (1): 61–65.
  • Nathorst, A.G. 1877. Om de kambriska och siluriska lagren vid Kiviks Esperöd i Skåne, jemte anmärkningar om primordialfaunans lager vid Andrarum. Geologiska Föreningens i Stockholm Förhandlingar 3: 263–273.
  • Nielsen, A.T. and Schovsbo, N.H. 1999. The Leptoplastus Zone (Upper Cambrian) at Slemmestad, Norway. In: M. Eriksson (ed.), Lundadagarna i Historisk geologi och paleontologi VI, 15–16 mars 1999, Abstracts. Lund Publications in Geology 144: 22.
  • Öpik, A.A. 1979. Middle Cambrian agnostids: Systematics and biostratigraphy. Bureau of Mineral Resources, Geology and Geophysics, Bulletin 172: 1–188.
  • Schovsbo, N.H. 2001. Why barren intervals? A taphonomic case study of the Scandinavian Alum Shale and its faunas. Lethaia 34: 271–285.
  • Skinner, B.J. and Porter, S.C. 1987. Physical Geology. 750 pp. John Wiley & Sons, New York.
  • Thickpenny, A. 1984. The sedimentology of the Swedish Alum Shales. In: D.A.V. Stow and D.J.W. Piper (eds.), Fine−grained Sediments: Deepwater Processes and Facies. Geological Society of London Special Publication 15: 511–525.
  • Thickpenny, A. 1987. Palaeo−oceanography and depositional environment of the Scandinavian alum shales: sedimentological and geochemical evidence. In: J.K. Leggett and G.G. Zuffa (eds.), Marine Clastic Sedimentology—Concepts and Case Studies, 156–171. Graham & Trotman, London.
  • Tullberg, S.A. 1882. Skånes graptoliter. I. Allmän öfversigt öfver de siluriska bildningarne i Skåne och jemförelse med öfriga kända samtidiga aflagringar. Sveriges Geologiska Undersökning C 50: 1–44.
  • Westergård, A.H. 1922. Sveriges olenidskiffer. Sveriges Geologiska Undersökning Ca 18: 1–205.
  • Westergård, A.H. 1943. Den kambro−siluriska lagerserien. In: S. Johansson, N. Sundius, and A.H. Westergård (eds.), Beskrivning till kartbladet Lidköping. Sveriges Geologiska Undersökning Aa 182: 22–89.
  • Westergård, A.H. 1947. Supplementary notes on the Upper Cambrian trilobites of Sweden. Sveriges Geologiska Undersökning C489, 1–34.
Typ dokumentu
Bibliografia
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