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Conodonts from the lower Ordovician at Hunneberg, south-central Sweden

  • A. Löfgren (a1)
  • DOI: http://dx.doi.org/10.1017/S0016756800009870
  • Published online: 01 May 2009
Abstract
Abstract

Six sections through lower Ordovician shale and limestone at Hunneberg have been sampled for conodonts. Forty-nine limestone horizons and 34 shale surface samples yielded over 40000 conodont elements. The degree of biostratigraphic resolution permitted further subdivision of the post-Tremadoc Paroistodus proteus Zone into four successive intervals. Preliminary studies of coeval rocks in other areas of Sweden show that this subdivision applies elsewhere as well. Comparison with published sections from, for example, Newfoundland, Estonia and Kazakhstan indicates that the fourfold subdivision of the P. proteus Zone proposed here could significantly increase the correlation accuracy, even internationally, within this critical part of the Ordovician. Graptolites and trilobites found together with the conodonts at Hunneberg indicated that the new subdivision could help to correlate biostratigraphic units based on these fossil groups. Thus the two lower intervals of the P. proteus Zone correspond to the M. (E.) armata trilobite Zone, and the upper two are approximately equal to the M. (V.) planilimbata Zone. The base of the T. phyllograptoides graptolite Zone at Hunneberg lies close to the boundary between the upper middle and uppermost intervals of the P. proteus Zone, but the graptolitic chronozonal boundary may be lower. The overlying Prioniodus elegans Zone is mainly represented by graptolitic shale at Hunneberg, but conodont faunas have been found in it, and co-occurrences of conodonts and graptolites have been noted.

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This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

M. Lindström 1955. Conodonts from the lowermost Ordovician strata of south-central Sweden. Geologiska Föreningens i Stockholm Förhandlingar 76, 517604. Stockholm.

M. Lindström 1957. Two Ordovician conodont faunas found with zonal graptolites. Geologiska Föreningens i Stockholm Förhandlingar 79, 161–78.

M. Lindström 1971. Lower Ordovician conodonts of Europe. Geological Society of America, Memoir127, 2161. Boulder, Colorado.

V. A. Rejebian , A. G. Harris & J. S. Huebner 1987. Conodont color and textural alteration: An index to regional metamorphism, contact metamorphism, and hydrothermal alteration. Geological Society of America Bulletin 99, 471–9.

E. Sturkell 1991. Tremadocian Ceratopyge Limestone identified by means of conodonts, in Jämtland, Sweden. Geologiska Föreningens i Stockholm Förhandlingar 113, 185–8.

R. Teves & M. Lindström 1988. The Brattefors plugs: collapse structures initiated during a Tremadocian regression. Geologiska Föreningens i Stockholm Förhandlingar 110, 5566.

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Geological Magazine
  • ISSN: 0016-7568
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