NGT41-1-03
1961
A new silicified coral from the Upper Ordovician of the Oslo region
41
1
79-84

Rugose corals with polygonal (mainly triangular) and elliptical cross section have recently been described from several areas, and their taxonomy and phylogeny has been discussed (Duncan 1957, Oliver 1958). In the upper Ordovician they are good guide fossils (Duncan 1956). The presence af a calceoloid silicified rugose coral from zone 5b in the Oslo Region might therefore be worth notice.

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