Krekling, Hagastrand member (Ordovician to of Norway)

Where: Eiker-Sandsvær, Norway (59.7° N, 9.7° E: paleocoordinates 37.0° S, 14.8° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Megistaspis (Paramegistaspis) planilimbata trilobite zone, Hagastrand Member (Tøyen Formation), Tremadocian to Tremadocian (485.4 - 470.0 Ma)

• member-level stratigraphic resolution

Environment/lithology: green, silty shale and coarse-grained limestone

• "Here the Hagastrand Member is readily accessible, above the (presently unexcavated) Bjørkåsholmen Formation. Fjelldal ( 1966, p. 21) records the lowest part of the Hagastrand Member as 50-60 cm of green, silty shale, fining upwards, and containing some inarticulate brachiopods in the upper part. The limestone

•facies of the Hagastrand Member, begins, however, with a thin, coarsely crystalline calcite layer, which gives way to more micritic limestone (mostly a marl) with horizontal and vertical intercalations of grey to black shale. All six main beds have a similar texture and, in hand specimens, the fossils occur randomly orientated in the rock. The lowest bed cleared in 1995 is overlain by 12 cm of unfossiliferous shale and then more limestone.

Size classes: macrofossils, mesofossils

Primary reference: O. A. Hoel. 1999. Trilobites of the Hagastrand Member (Tøyen Formation, lowermost Arenig) from tbe Oslo Region, Norway, Part Il : Remaining non-asaphid groups. Norsk Geologisk Tidsskrift 79:259-280 [B. Kröger/B. Kröger]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 190974: authorized by Björn Kröger, entered by Björn Kröger on 02.01.2018

Creative Commons license: CC BY (attribution)

Taxonomic list

 Agnostida - Metagnostidae
Geragnostus (Geragnostella) wimani Tjernvik 1956 trilobite
 Asaphida - Asaphidae
Megalaspides nericiensis Wiman 1905 trilobite
Niobe (Niobella) bohlini Tjernvik 1956 trilobite