Ordovician conodonts from the Bulltinden Formation, Motalafjella, central-western Spitsbergen

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...

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Bibliographic Details
Published in:Polar Research
Main Authors: Armstrong, Howard A., Nakrem, Hans A., Ohta, Yoshihide
Format: Article in Journal/Newspaper
Language:English
Published: Norwegian Polar Institute 1986
Subjects:
Bulltinden
Motalafjella
North Atlantic
Polar Research
Spitsbergen
Online Access:https://polarresearch.net/index.php/polar/article/view/2487
https://doi.org/10.3402/polar.v4i1.6915
Description
Summary: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.

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