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The Middle Ordovician of the Oslo Region, Norway, 33. Trilobites from the Lowermost Part of the Ogygiocaris Series

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The Middle Ordovician of the Oslo Region, Norway, 33. Trilobites from the Lowermost Part of the Ogygiocaris Series The Middle Ordovician of the Oslo Region, Norway, 33. Trilobites from the lowermost part of the Ogygiocaris Series BJØRN T. G. WANDÅS Wandås, B. T. G., 1983: The Middle Ordovician of the Oslo Region, Norway, 33. Trilobites from the lowermost part of the Ogygiocaris Series. Norsk Geologisk Tidsskrift, Vol. 63, pp. 211-267. Oslo 1983. ISSN 0029-196X. The described trilobite fauna occurs in beds immediately underlying the Upper Didymograptus Shale (Llanvim). A total of 34 species belonging to 21 genera are identified. The trilobites consist almost entirely of Baltoscandian types, but a fauna! link to the trilobite fauna of the serpentine Otta Conglomer­ ate in central Norway, and to Western Newfoundland is documented. Five new species are described: Geragnostus hadros n.sp., Ogmosaphus tropidalox n. sp. , Megistaspis (Heraspis) /aticauda n.sp. , Megista­ spis (Megistaspidella) giganteus n.sp., Megistaspis (Megistaspidel/a) maximus n.sp. Other recognised genera include: Carolinites, Telephina, Turgicephalus, Bronteopsis, 11/aenus, Scotoharpes, Cybelurus and Metopolichas as well as the species Asaphus (Neoasaphus) platyurus Angelin, 1854. The latter, in part, documents the presence of the boundary between the Olandian and Viruan Series (Lower and Middle Ordovician) in the Oslo Region. B. T. G. Wandds, Oljedirektoratet, Box 600, N-4001 Stavanger, Norway. Studies of the boundary between the Orthoceras and its fauna. The object of this study was taken Limestone and the Upper Didymograptus Shale from a list by Henningsmoen (1965b). In this list and the contained trilobites has shown that there of fossils for the Orthoceras Limestone of the is a distinct lithological unit between the compact Oslo Region were 21 species of trilobites from Endoceras Limestone and the dark Upper Didy­ the transition beds. All of these species are re­ mograptus Shale which corresponds to the so­ vised herein with the exception of Ptychopyge called transition beds. Here the transition beds sp., Ampyx mammilatus and Hemisphaeroco­ are defined as a lithostratigraphical unit of pale ryphe n. sp. aff. pseudohemicranium (Niesz­ weathering altemating thin bedded limestones, kowski 1859), forms not identified in old or new nodular limestones and shales varying in thick­ collections. Nikolaisen (1962, p: 14) reported a ness from less than l m in the area around Oslo specimen of komaspidid aff. Carolinites (Pl. 2: I) to several metres in the Modum, Hadeland and from 2 m leve! in the profile at Helskjær, an Nes-Hamar Districts. Previously the transition identification which R. A. Fortey (1982, pers. beds were also defined biostratigraphically to in­ comm.) informs me is correct. clude the upper vertical range of the trilobite Other works of interest dealing with the beds genus Megistaspis. It is shown in this study that of the lowermost part of the Ogygiocaris Series the lithological and biostratigraphical boundaries are Brøgger (1882), Bjørlykke (1898), Holtedahl only coincide at Furnes. At other localities the (1909), Størmer (1934), Skjeseth (1955 and genus Megistaspis occurs both in the transition 1963), Henningsmoen (1960, 1969 and 1971), beds and well into the overlying Upper Didymo­ Nikolaisen (1963), Berry (1964), Kohut (1972) graptus Shale. and Skaar (1972). New lithostratigraphical units for the Ordovi­ cian strata in the Oslo Region are in preparation (Bockelie et al.), but until they are published, Localities in Norway the classification of Størmer (1953) is followed. In 1950 a research project on the Middle Or­ Vikersundbakken (NM562449). - Heggen Area, dovician of the Oslo Region was initiated by Modum District: by the road to the ski jump at Størmer (Størmer 1953). This was the most ex­ Vikersundbakken. Trilobites from the lowermost tensive paper dealing with the transition beds part of the Ogygiocaris Series in this area almost 212 B. T. G. Wandås NORSK GEOLOGISK TIDSSKRIFT 4 (1983) name introduced for the transition beds in this ORDOVICIAN OUTCROPS IN THE OSLO REGION, area by Skjeseth (1963). NORWAY Furnes (PN099472). - Nes-Hamar District: a small rise by the road junction near Furnes CD KREKLING Church, north of Hamar. The locality is now ® VIKERSUNDBAKKEN almost completely covered by vegetation, and @ HOVODDEN this was also the case regarding the lower few @ NES CHURCH metres of the transition beds when the locality @ HELSKJÆR was visited by Henningsmoen in 1961. I have @ FURNES redrawn his profile measurements from his un­ published field notes. Stablum (Stavlum) (NM444161). - Krekling, Eiker-Sandsvær District: by the road opposite the farm. The locality was measured by Skaar (1972) who identified 1.2 m of shaly beds with limestone nodules on top of the Orthoceras Limestone. I have collected and identified only a few specimens from these beds: Asaphus (Asa­ phus)striatus (Boeck, 1838), Cyrtometopus clavi­ fro ns (Dalman, 1827), Megistaspis (Megistaspi­ della) sp. indet., and one ostracod Conchoprimi­ tia sp. The transition beds in the Oslo area are ex­ posed at several localities (Størmer 1953 and Skaar 1972), where less than l m of transition \ beds are present. I have only been able to con­ firm the occurrence of Asaphus (A .) striatus and indeterminate parts of Megistaspis (Megistaspi­ KIEN­ della) sp. from own and previous collecting. NGESUN Fig. l. Map of the Oslo Region showing localities where the Stratigraphical significance of the transition beds have been examined (after Størmer, 1953). trilobites and comparison with some other areas The deposition of the Orthoceras Limestone in exclusively come from the Vikersundbakken lo­ the Oslo Region was a result of a shallowing cality, but two other complete sections of the during the late Arenig-early Llanvirn (Jaanusson transition beds are exposed by the road below 1973). At this time the Orthoceras Limestone the main locality (NM561448) and on the north­ was deposited in the central Baltoscandian Con­ em hillside in Kalvedalen (NM56344431). facies belt as well as the Oslo Region. By mid­ Llanvim times a transgression took place (Bru­ Ho vodden (NM785952). -Hadeland District: a ton & Owen 1982, p. 13), but the Oslo Region peninsula on the eastem shore of Randsfjorden. and the central Baltoscandian Confacies belt The locality has been described by Størmer shared trilobite genera and species in common (1953, p. 89) and Skaar (1972), but has yielded also in a short period after the start of the trans­ relatively few specimens. gression. A comparison with the Gigas Lime­ Helskjær (PN088329). - Helgøya, Nes-Hamar stone of Sweden shows almost full agreement District: at the beach. This locality was measured regarding the trilobite faunas. Bohlin (1955) in­ and collected by Størmer (1953) and Hennings­ cluded a list of 13 genera of trilobites identified moen (1961). The locality is the type locality of from the Gigas Limestone of bland. Johansson the Helskjær Shale and Limestone Member, a (1976) added two more genera from the Gigas NORSK GEOLOGISK TIDSSKRIFT 4 (1983) Trilobites from the Oslo Region 213 Vlkenund­ Limestone at Kinnekulle, Vastergotland. Com­ ....... n Hov odelen parison with the trilobite faunas from the Gigas Limestone of Sweden and the lowermost part of the Ogygiocaris Series in the Oslo Region shows that 13 of the 15 genera identified from Sweden are in common (86.7%- Simpson 1960, Index 2 of faun al resemblance) (the two genera not iden­ tified be ing Odontopleura and Celmus), and of the 13 identified species 8 are in common (61.5%- Simpson Index 2). In Sweden the boundary between the Olan­ dian and Viruan Series is not recognised on litho­ logical evidence, but only by a sharp fauna! change, the most important being the last occur­ rence of the genus Megistaspis (represented by M. (Megistaspidella) gigas (Angelin, 1851)) and the first appearance of Asaphus (Neoasaphus) (represented by A. (N.)platyurus Angelin, 1854), see: Jaanusson & Mutvei 1953, 1982; Jaanusson 1960b, 1982a, b, c; R66musoks 1960; Mannil 1966; Jaanusson, Larsson & Karis 1982; Jaanus­ son & Karis 1982, and Karis & Larsson 1982. The succession of M. (M.) giganteus (closely re­ lated toM. (M.) gigas) and A. (N.) platyurus at Furnes, strongly indicates the presence of this boundary also in Norway. The range of Megistaspis and Ogygiocaris overlap each other at Vikersundbakken and Helskjær, and Skjeseth (1963, p. 63) also reports O. cf. dilatata fromthe transition beds at Furnes. Although present, only very few specimens of Ogygiocaris are found to occur within the range of Megistaspis, while specimens of Ogygiocaris are common already in the shale, limestone and limestone nodules just above the last occurrence of Megistaspis.In Sweden the Gigas Limestone is succeeded by more limestone development in Vastergotland, Ostergotland, Oland as well as in Jamtland. The only record of Ogygiocaris from these beds is found in Johansson {1977), who reported O. dilatata in a grey limestone bed be­ tween the red Gigas and Platyurus Limestone at Gullhogen, Vastergotland, and specimens of O. sarsi from slightly younger beds at Kinnekulle. The Anderso (Ogygiocaris) Shale in Jamtland, in which species of Ogygiocaris also occur (Hadding 1913 and Henningsmoen 1960), is now regarded Fig. 2. Measured sections at the four most important localities. Stippled lines mark the boundary between the transition beds and the lowermost part of the Upper Didymograptus Shale as definedby the author. The profile from Furnes is redrawn from Henningsmoen (unpubl. field notes). 214 B. T. G. Wandås NORSK GEOLOGISK TIDSSKRIFr 4 (1983) Trilobites recorded from the lowermost part of the Ogygiocarfs Series in the Oslo Region, Norway. w u ." L .� ; . 2 -"� .>< ." w .>< ." .>< . L L . w . .., � � � ." o . , : : � o o Fand ly METAG NOSTIDAE Jaekel, 1909 Geragnostus hadros n. sp. Fa•ily KOMASPIOIDAE Kobayeshi, 1935 Carolinites sp. Fa111i ly TELEPHINIDAE Marek, 1952 Telephina (TelephinaJ aulaata Nikolahen, 1963 Telephina (Telephina) viriosa Nikolafsen, 1963 TeZ.ephina (TeZ.ephinaJ mobezogi CHadding. 1913) F1•1ly ASAPHIOAE Bur•eister, 1843 As ap hus (Aøaphua) s t:riatus C Boeck, 1838) Asap hus (Asap hus) cf. striatus Asaphus (As aphus? J sp. Asaphus (Neoasaphus) platyurus AngeUn, 1854 Ogmasaphus tzoopidal.oz n. sp.
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