Die Oberdevon-Flora der Bäreninsel, 5. Gesamtübersicht
published: Apr 7, 2006
The Upper Devonian of Bear Island has been subdivided in three series (Horn & Orvin 1928, Kaiser 1970, 1971), which can be easily distinguished based on their lithology and biostratigraphy. The Misery Series is exposed on the eastern part of the island from Roedvika to Kapp Levin and comprises (Famennian) Fa2a-Fa2c. The Seamless Sandstone Series follows from Kapp Levin to Framnes. Its lower part belongs to Fa2c based on the spore content. The upper part is devoid of fossils and appears to belong to Tn1a ϒ (sensu Conil et al. 1967). The same age applies for the Tunheim Series, which is exposed from Framnes to almost Kapp Olsen with some interruptions (compare Text-fig. 1). The Tn1aϒ corresponds to the Etroeungt-Stage (Strunian) and is of latest Devonian age.
The division of the Upper Devonian (Roedvika Formation) as suggested by Worsley & Edwards (1976) into Vesalstranda-, Kapp Levin-, and Tunheim Member is not followed, because it ignores the biostratigraphic evidence that correlates well with the lithological boundaries of Kaiser.
The Misery Series was deposited under limnic conditions, the Tunheim Series at least partly under paralic conditions. Palaeoecological features of both series are discussed and the different composition of the floras is illustrated with vegetation sketches.