Keyserløkka. Base of section (Ordovician of Norway)

Where: Oslo, Norway (59.9° N, 10.8° E: paleocoordinates 31.7° S, 9.6° W)

When: Diplograptus foliaceus graptolite zone, Lower Member (Arnestad Formation), Haljala (460.9 - 449.5 Ma)

• The Arnestad Formation overlies the nodular limestones of the Vollen Formation and is overlain by the nodular limestone dominated Frognerkilen Formation.

• group of beds-level stratigraphic resolution

Environment/lithology: limestone

• The Arnestad Formation (Figs 2–5) is a bioturbated, dark grey, fissile, siliciclastic mudstone with intercalated, thin beds or nodular horizons of calcareous mudstone and wackestone.

Size class: macrofossils

Primary reference: J. Hansen and D. A. T. Harper. 2008. The late Sandbian – earliest Katian (Ordovician) brachiopod immigration and its influence on the brachiopod fauna in the Oslo Region, Norway. Lethaia 41(1):25-35 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 186390: authorized by Pete Wagner, entered by Pete Wagner on 21.06.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

Strophomenata
 Strophomenida - Grorudiidae
Grorudia glabrata Spjeldnaes 1957
 Strophomenida - Aegiromenidae
Chonetoidea sp. Jones 1928
Rhynchonellata
 Orthida - Dalmanellidae
Onniella bancrofti Lindström 1953
 Orthida - Cremnorthidae
Lingulata
  -
Lingulata indet. Gorjansky and Popov 1985