Skavråker (Ordovician to of Norway)

Where: Oslo, Norway (59.1° N, 9.7° E: paleocoordinates 31.9° S, 10.0° W)

• local area-level geographic resolution

When: Skavraker Member (Steinvika Limestone Formation), Actonian to Actonian (454.0 - 449.5 Ma)

• member-level stratigraphic resolution

Environment/lithology: deep subtidal shelf; lithified, bioturbated, argillaceous lime mudstone and shale

• Interbedded thinly laminated bioclastic calcilutites and argillaceous mudstones
• At Skavråker the lowermost 3.6 m of the member consist of pale calcilutites with subordinate argillaceous mudstones. The latter occur as thin, wispy, and discontinuous laminae and impart a reticulate aspect to the pale calcilutites. The mudstone is highly bioturbated.

Size class: macrofossils

Preservation: cast

Primary reference: T. L. Harland. 1980. The Middle Ordovician of the Oslo region, Norway, 28. Lithostratigraphy of the Steinvika Limestone Formation, Landesund-Skien district. Norsk Geologiske Tidsskrift 60:269-278 [A. Miller/P. Novack-Gottshall/A. Clement]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 3254: authorized by Arnold Miller, entered by Phil Novack-Gottshall on 27.07.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
 Sphaeronitida - Sphaeronitidae
Haplosphaeronis sp.
Haplosphaeronis sp. Jaekel 1926
 Rhombifera - Echinosphaeritidae
Echinosphaerites aff. grandis
 Rhombifera - Caryocystitidae
Heliocrinites sp.
Heliocrinites sp. Eichwald 1840
Stenolaemata
 Trepostomata - Halloporidae
Diplotrypa sp.
Diplotrypa sp. Nicholson 1879
Rhynchonellata
 Orthida - Dalmanellidae
Howellites sp.
Howellites sp. Bancroft 1945
 Orthida - Hesperorthidae
Dolerorthis cf. duftonensis
 Protorthida - Skenidiidae
Skenidioides sp.
Skenidioides sp. Schuchert and Cooper 1931
Strophomenata
 Strophomenida - Rafinesquinidae
Leptaena sp.
Leptaena sp. Dalman 1828
Trilobita
 Phacopida - Pterygometopidae
"Toxochasmops extensus" = Toxochasmops (Toxochasmops) extensus
"Toxochasmops extensus" = Toxochasmops (Toxochasmops) extensus Boeck 1838 trilobite