Notes on Silurian stratigraphy and correlation in the Oslo district

Studies of shelly and graptolite faunas from selected sections in the Silurian of the Oslo district allow correlations to be made with the standard sequences of Britain to a finer degree than has hitherto been attempted; particular attention is paid to beds of Middle Llandovery to early Wenlock age. Some of the 'Stages' and 'Zones' established by Kiær (1908) are shown to be diachronous. Two graptolites are described, one (Monoclimacis vomerina vikensis) as a new subspecies, and the other (Monograptus sp. A) as a species of uncertain affinity.