Aspects of carbonate sedimentation in the Ordovician of Baltoscandia

In the Baltoscandian epicontinental sea the normal type of Ordovician carbonate sediments was a mixture, in various proportions, of skeletal sand and carbonate mud. In some marginal areas sediments of Bahaman type were deposited during the latest part of the Viruan Epoch, and such sediments were widely distributed from the very latest Ordovician onwards. It is suggested that deposition mostly took place in a temperate climatic zone and that the bahamitic deposits indicate an increase of temperature to subtropical or tropical level.