Zone V1b, Ny Friesland ( of Norway)

Where: Spitsbergen, Norway (79.8° N, 17.8° E: paleocoordinates 5.7° S, 31.9° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Olenidsletta Member (Valhallfonna Formation), Ibexian (487.5 - 470.0 Ma)

• While collections were made throughout section, only ranges of trilobite species are reported. Zone V1b comprises meters 6-40 of the Olenidsletta Member. Likely correlates with part of "zone I" of Ross 1951, Hintze 1951, 1952.

• group of beds-level stratigraphic resolution

Environment/lithology: slope; lithified, black limestone and lithified, black shale

• "The dominant lithologies of this part of the section are finely crystalline black limestones and shales, the former often with perfectly regular fine laminations, having a concoidal fracture and, when broken, emitting a strong, bituminous or sulphureous odor." Fortey 1974

Size class: macrofossils

Collected by R. A. Fortey in 1967

Primary reference: R. A. Fortey. 1980. The Ordovician trilobites of Spitsbergen. III. Remaining trilobites of the Valhallfonna Formation. Norsk Polarinstitutt Skrifter 171:1-163 [M. Hopkins/M. Hopkins]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 106471: authorized by Melanie Hopkins, entered by Melanie Hopkins on 18.03.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

• Lingulids and graptolites also present (see Fortey and Brunton 1973)
Show authors, comments, and common names
Artiopoda
 Agnostida - Agnostidae
Micragnostus serus
Micragnostus serus Fortey 1980
Trilobita
 Olenida - Olenidae
Plicatolina sp., Bienvillia stikta, Psilocara patagiatum, Anaximander clavatus, Balnibarbi sombrero, Balnibarbi pulvurea, Cloacaspis dejecta, "Balnibarbi ceryx" = Cloacaspis ceryx
Plicatolina sp. Shaw 1951 trilobite
Bienvillia stikta Fortey 1974 trilobite
Psilocara patagiatum Fortey 1974 trilobite
Anaximander clavatus Fortey 1974 trilobite
Balnibarbi sombrero Fortey 1974 trilobite
Balnibarbi pulvurea Fortey 1974 trilobite
Cloacaspis dejecta Fortey 1974 trilobite
"Balnibarbi ceryx" = Cloacaspis ceryx Fortey 1974 trilobite
subspecies ceryx and anataphra
 Asaphida - Asaphidae
"Paraptychopyge disputa" = Lachnostoma disputa
"Paraptychopyge disputa" = Lachnostoma disputa Fortey 1975 trilobite
 Proetida - Telephinidae
Oopsites hibernicus, Carolinites genacinaca, Opipeuter inconnivus
Oopsites hibernicus Reed 1909 trilobite
Carolinites genacinaca Ross 1951 trilobite
subspecies genacinaca