Fifteen species of bryozoa have been identified from etage 5b at Ullerntangen, Ringerike district, Norway. Six new species are described: viz. Enallopora osloensis, Stictopora parvula, Dicranopora minuta, Sceptropora estoniensis, Trematopora ullernensis, and Eridotrypa norvegica. The bryozoan assemblage is similar to that of the Porkuni beds of Estonia, but differs from contemporaneous Ordovician faunas of southern and central Sweden.
Late Ordovician bryozoa from Ringerike, Norway