Abstract
The Llandovery Rytteråker Formation is a carbonate-dominated lithologic unit which extends over the whole Oslo Region. Eight composite sections reveal five characteristic facies associations. These represent different, laterally coexisting depositional settings of an incipient, storm-dominated carbonate platform, which developed out from the transition zone between an open and a restricted marine basin. A mixed carbonate/siliciclastic shelf-lagoonal unit, a bioclastic shoal/barrier unit, a bioherm unit, a tidal delta/shallow shelf association and a mud-dominated deeper neritic unit are presented with their typical inventory of sedimentary structures. A possible tidal inlet fill sequence is reported from the Skien district where it is incised into bioclastic shoal deposits. Biostratigraphic correlation points to diachroneity of facies units and reveals their lateral and vertical association as being due to the migration of depositional belts. General palaeogeographic implications of the observed facies pattern are discussed and an attempt is made to place them into their global palaeoclimatic and geotectonic context.
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