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A 12- to 14-million year faunal diversity cycle in the Ordovician of Western Baltica
12- to 14-million year faunal diversity cycle Ordovician of Western Baltica
2009/12/3
The faunal (all fossil groups) species diversity curve for the Ordovician of Norway shows a strong and statistically significant cycle with a period of 12 to 14 million years. The cycle is supported b...
Dendroid graptolites in the Elnes Formation (Middle Ordovician) Oslo Region,Norway
Dendroid graptolites Elnes Formation Oslo Region
2009/12/3
Well preserved relief specimens of the dendroid graptolites Dendrograptus rigidus Bulman, 1936 and Acanthograptus sp. have been discovered in a siltstone within the basal Engervik Member of the Elnes ...
Two species belonging to the Class Stelleroidea are described from Ordovician rocks of the Oslo Region, Norway. These are the asteroid, Cnemidactis osloensis n.sp, from the Elnes Formation (Llanvirn) ...
Brachiopod bio- and ecostratigraphy in the lower part of the Arnestad Formation (Upper Ordovician),Oslo Region,Norway
Brachiopod bio- and ecostratigraphy lower part Arnestad Formation
2009/12/3
The aim of the present study is to improve knowledge of the brachiopod fauna in the lower part of the Arnestad Formation (Caradoc) in the Oslo-Asker district and to document faunal changes prior to th...