Bjørkåsholmen, Asker - Gamma: Varangu, Norway

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda - Bellerophontida - Bucanellidae
Sinuitella norvegica (Brøgger 1882)
Yochelson 1962
Agnostida - Metagnostidae
Geragnostus sidenbladhi
Geragnostus crassus Tjernvik 1956
Trinodus mobergi Tjernvik 1956
Trilobita - Phacopida - Cheiruridae
Parapilekia speciosa
Pliomeroides primigenus
Trilobita - Harpetida - Harpididae
Harpides rugosus
Trilobita - Olenida - Eulomidae
Euloma ornatum
Trilobita - Olenida - Olenidae
Parabolinella lata Henningsmoen 1957
Triarthrus angelini Linnarsson 1869
Saltaspis sp. Harrington and Leanza 1952
Hypermecaspis rugosa (Brøgger 1882)
Trilobita - Ptychopariida - Shumardiidae
Shumardia pusilla Sars 1835
Trilobita - Trinucleida - Alsataspididae
Pagometopus gibbus n. gen., n. sp.
Falanaspis aliena Tjernvik 1956
Orometopus elatifrons
Trilobita - Asaphida - Hungaiidae
Dikelokephalina dicraeura
Trilobita - Asaphida - Nileidae
Varvia longicauda
Nileus limbatus
Symphysurus angustatus (Sars and Boeck 1838)
Trilobita - Asaphida - Asaphidae
Promegalaspides (Borogothus) intactus (Moberg and Segerberg 1906)
Niobe insignis
Niobella obsoleta (Linnarsson 1869)
Trilobita - Asaphida - Remopleurididae
Apatokephalus serratus Boeck 1838
Trilobita - Asaphida - Ceratopygidae
Tropidopyge broeggeri (Moberg and Segerberg 1906)
Ceratopyge forficula
Ceratopyge forficula acicularis
    = Ceratopyge acicularis
Ebbestad 1999
see common names

Geography
Country:Norway State/province:Oslo County:Asker
Coordinates: 59.1° North, 11.2° East (view map)
Paleocoordinates:38.9° South, 16.7° West
Geographic resolution:local area
Time
Period: Ordovician Epoch: Early Ordovician
Stage: Tremadocian 10 m.y. bin: Ordovician 1
*Period:Early/Lower Ordovician *Epoch:Late/Upper Tremadoc
Key time interval: Varangu Trilobite zone:  Apatokephalus serratus
Age range of interval: 482.2 - 481.3 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Bjorkasholmen
Stratigraphic resolution:member
Stratigraphy comments: Kiaerograptus supremus graptolite zone. Was listed as Ceratopyge 3a
Lithology and environment
Primary lithology: lithified conglomerate
Environment:offshore shelf
Geology comments: Mainly pale weathering nodular limestone
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection excludes:some macrofossils
Reason for describing collection:taxonomic analysis
Taxonomic list comments:Trilobite systematics. Needs to be divided first into alpha, beta & gamma portions of Certopyge "member." Should just be replaced with Ebbestad's (1999) monograph.
Metadata
Also known as:Was: Bjorkasholmen (Ceratopyge) Fm., Oslo Region, Norway
Database number:3183
Authorizer:A. Miller, P. Wagner Enterer:P. Novack-Gottshall, P. Wagner
Modifier:P. Wagner Research group:marine invertebrate
Created:1999-07-27 14:14:43 Last modified:2018-04-12 15:59:10
Access level:the public Released:1999-07-27 14:14:43
Creative Commons license:CC BY
Reference information

Primary reference:
113. G. Henningsmoen. 1959. Rare Tremadocian trilobites from Norway. Norsk Geologiske Tidsskrift 39:153-174 [A. Miller/P. Novack-Gottshall/A. Clement]

Secondary references:

25437 J.O.R. Ebbestad. 1999. Trilobites of the Tremadoc Bjørkåsholmen Formation in the Oslo Region, Norway. Fossils and Strata 47:1-118 [P. Novack-Gottshall/P. Hearn]
15207 E. L. Yochelson. 1962. Early Ordovician gastropods from the Oslo Region, Norway. Norsk Geologisk Tidsskrift 42(3):239-252 [P. Wagner/P. Wagner]