NORWEGIAN JOURNAL OF GEOLOGY Vol 99 Nr. 1 https://dx.doi.org/10.17850/njg99-1-07 Silurian vertebrate remains from the Oslo Region, Norway, and their implications for regional biostratigraphy Oskar Bremer1, Susan Turner2, Tiiu Märss3 & Henning Blom1 1Uppsala University, Department of Organismal Biology, Norbyvägen 18A, 752 36, Uppsala, Sweden. 2Honorary Research Fellow, Queensland Museum Geosciences, 122 Gerler Road, Hendra, Queensland 4011, Australia. 3Department of Geology at Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia. E-mail corresponding author (Oskar Bremer):
[email protected]. Several vertebrate assemblages are described from the Silurian of the Oslo Region, Norway, based on the review and revision of previous reports of microremains, as well as unpublished material from museum collections. Articulated thelodont specimens from the Rudstangen Fauna, Ringerike Group, are also described here for the first time, revealing a seemingly monogeneric loganelliid assemblage. The oldest assemblage (mid-Llandovery) only contains the thelodont Loganellia cf. aldridgei, while a single sample from upper Llandovery strata produced four Thelodus sp. scales. These scales share features with those from younger Thelodus taxa and give additional support to an early appearance of this genus. The mid-Wenlock faunas consist of thelodonts Loganellia grossi, Loganellia einari and Thelodus laevis. These are joined by the thelodont Paralogania martinssoni, anaspids Rhyncholepis parvula and cf. Pterygolepis nitida, as well as the osteostracans cf. Tyriaspis whitei and Osteostraci gen. et sp. indet. in late Wenlock and earliest Ludlow faunas. These complement the previously described anaspids and osteostracans of the Rudstangen Fauna based on articulated specimens. The faunas of a number of calcarenite samples collectively contain the thelodonts L.