. Bulletin of the British Museum (Natural History), Geology. . (gap) 2 5 G (3*) 5 4 3 3 ~~~~ ::[::: ~ _ > ~~~~ G ~ ~ G ->>I g -»_. G -»I 5 ~__~__ ss 1 1 1 3*) G 3 HE^Ii :::>: ^7=n Dark shales/ ^-l thin clastic turbidites Thickly bedded elastics Purple shales Nodular limestones/ thinly bedded Bioclastic limestones Bioherms Graptolites Eopiectodonta Stricklandia/mid-shelf Pentamerus (3+) no Pent Eocoelia (2) no Eocoelia. Lingula/molluscs incl. Palaeocyclus Erinostrophia j Fig. 6 The lithologies of the rocks shown in Fig. 4, together with the animal communities present. the Vik Fo
. Bulletin of the British Museum (Natural History), Geology. . (gap) 2 5 G (3*) 5 4 3 3 ~~~~ ::[::: ~ _ > ~~~~ G ~ ~ G ->>I g -»_. G -»I 5 ~__~__ ss 1 1 1 3*) G 3 HE^Ii :::>: ^7=n Dark shales/ ^-l thin clastic turbidites Thickly bedded elastics Purple shales Nodular limestones/ thinly bedded Bioclastic limestones Bioherms Graptolites Eopiectodonta Stricklandia/mid-shelf Pentamerus (3+) no Pent Eocoelia (2) no Eocoelia. Lingula/molluscs incl. Palaeocyclus Erinostrophia j Fig. 6 The lithologies of the rocks shown in Fig. 4, together with the animal communities present. the Vik Formation on MalmOya, and at the top of the Rytteraker Formation and at the base of the Vik Formation at Sandvika (Baarli 1990). LATE LLANDOVERY AND EARLY WENLOCK FORMATIONS OF THE OSLO REGION Vik Formation This formation has its type area in the Ringerike district, where it has been divided into the Storoysundet, Garntangen and Abborvika Members (Worsley et al. 1983, p. 22) and where it is 80 m thick, as opposed to 55-70 m in the Oslo-Asker area. It overlies the Rytteraker Formation, which consists chiefly of bioclastic limestones (Moller 1987,1989). Although there are no continuous sections .hrough the Vik Formation in the south of the Oslo Region, we estimate that the true thickness in the Skien and Pors- grunn districts is approximately 60-70 m. There is great ithological variation in the formation. Concretionary lime- tones with nodules at various sizes dominate the unit in |>kien, Porsgrunn and Oslo-Asker, characteristically with '•mailer 'chicken-wire' nodules. Clastic content increases fur- her north, and the three members in the type area are hale-dominated. The StorOysundet and Abborvika members ire pale to dark reddish-brown shales, separated by the Garntangen Member's greenish-gray shales and nodular limestones. At Holmestrand (on Killingholmen Grid Ref. NL 752995) there is only a partial section which seems to repre- sent the middle of the Vik Formation and co
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