Geology and palynology of the Triassic succession of Bjørnøya

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Mørk, Atle ; Vigran, Jorunn Os ; Hochuli, Peter A (1990)

The Triassic succession of Bjørnøya (200 m) comprises the Lower Triassic Urd Formation (65 m) of the Sassendalen Group, and the Middle and Upper Triassic Skuld Formation (135 m) of the Kapp Toscana Group. These units are separated by a condensed '.'Middle Triassic sequence represented by a phosphatic remainé conglomerate (0.2m). The Urd Formation consists of grey to dark grey shales with yellow weathering dolomitic beds and nodules. Palynology indicates the oldest beds to be Diencrian; ammonoid faunas in the middle and upper part of the formation arc of Smithian age. The organic content (c. 1 %) includes kerogen of land and marine origin, reflecting a shallow marine depositional environment. The Skuld Formation is dominated by grey shales with red weathering siderite nodules. There are minor coarsening upwards sequences; the highest bed exposed is a 20 m thick, very fine-grained sandstone. Palynomorphs indicate a late Ladinian age for the lower part of the formation, and macrofossils and palynomorphs indicate Ladinian to Carnian ages for the upper part. Sedimentary structures, a sparse marine fauna and microplankton indicate deposition in a shallow marine environment. The organic residues contain dominantly terrestrially derived kerogen.
  • References (40)
    40 references, page 1 of 4

    Andcrsson, J . G. 1900: Ubcr die Stratigraphic und Tcktonik der Barcn Insel. Bull. Geol. Inst. Unio. Uppsuh 4. 243-2x0.

    Balmc, 8 . E. 1980: Palynology of Permian-Triaaaic boundary beds at Kap Stosch, Ea\t Grcciiland. Medde1el.w om Gr@riland 200 ((1). 1-37.

    Birkcnmajer, K . 1977: Triassic sedimentary formations of the Hornsund area. Spitshergen. Studiu Geologiccc f'oloniccr 2 (8))7-74.

    Bjordy, M., M0rk. A. & Vigran. I . 0 . 19x3: Organic gcochemical studies of the Devonian to Triassic cucces\ion on Bjdrneya and the implications for the Barcnts Shelf. Pp. 40- 59 in Bjorby, M. el al. (cds.): Aduunws in Ot&mic (hchemistry 1981. John Wilcy & Sons Ltd.

    Bjaerke, T . & Dypvik. H. IY77: Sedirncntological and pallynological studies of Upper Triassic-Lower Jura\\ic \cdinicnts in Sassenfjorden, Spitsbcrgcn. Norsk Polurin.~~itutArrhok 1976, 131-150.

    Bjaerke, T . L Manum, S B . 1977: Mchozoic palynology of Svalbard-I. The Rhactian of Hopcn, with prcliminiiry report on the Rhaetian and Jurassic o f Kong Karls Iirnd. No,:sk Polarinsriturt Skrifter 165, 1-48. 9 pls.

    Blendinger, E. 1988: Palynostratigraphy of the Latc Ladiniaii and Carnian in the Southeastern Doloinitcs. Rroiew of Palaeobotany and Palynology 53, 329-348.

    Buchan, S . H., Challinor, A , , Harland, W. B. & Parker. J. K 1965: Thc Triassic stratigraphy of Svalbard. Norsk folurimtirutr Skrifter 135. 95 pp,

    Bohm, J . 1899: Uber Triasfossilien der Baren-Insel. Zeitschrifr der geologlchen Gesellschaft, Berlin B.51, 325-326.

    BBhm, J . 1903: Uber die obertriadische Fauna der Bareninacl Kungliga Suenska Vetenskaps-Akademiens Haridlingar 37. I76.

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