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In the Scandinavian Caledonides a eugeosyncline is well developed while a miogeosyncline is only known in a few localities, possibly because this structure is concealed by covering nappes from the eugeosyncline. Both in the western and eastern facies of the eugeosyncline faunas with an American (Appalachian) aspect prevail. The foreland sediments, well demonstrated in the Oslo Region, show repeated invasions of arenaceous sediments apparently from the western part of the foreland and from the geosyncline. Certain sedimentary cycles are suggested. The floras and faunas are partly Baltic, British and American. A considerable thickness of sediments towards the end of the Silurian indicate the formation of a syneclise reaching from the Oslo Region via Scania to the Baltic. The ‘Faltungsgraben’ and Devonian ‘cuvettes’ in western Norway and Scotland are interpreted as similar, but more trough-like depressions (Aulacogenes).
