文章基本信息

标题：Ordovician conodonts from the Bulltinden Formation, Motalafjella, central-western Spitsbergen
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作者：Howard A. Armstrong ; Hans A. Nakrem ; Yoshihide Ohta 等
期刊名称：Polar Research
印刷版ISSN：1751-8369
出版年度：1986
卷号：4
期号：1
页码：17-23
DOI：10.3402/polar.v4i1.6915
语种：English
出版社：Co-Action Publishing
摘要：Seven samplcs from the Limcstonc and Boulder Conglomerate Members of the Bulltinden Formation have yicldcd poorly prcscrvcd conodonts. On tentative identifications Periodon aculeatus Hadding and Prioniodus cf. P. alobatus Bergstrom at the basc of thc formation suggest an Ordovician lower Caradoc, or older agc. This confirms that the Vcstgotabrccn Formation unconformably beneath underwent highpressure metamorphism during the Taconic and/or Finmarkian phases of the Caledonian orogeny. The conodonts show affinity to the North Atlantic Province suggesting a deeper water marine depositional cnvironmcnt. Conodont colour alteration indiccs of five indicate that the Bulltinden Formation was heated to tcmpcraturcs in cxcess of 3°K. probably during thc middle-upper Silurian main Caledonian uplift cvcnt.