Zone V4a, Ny Friesland (Ordovician of Norway)

Where: Spitsbergen, Norway (79.8° N, 17.8° E: paleocoordinates 0.7° N, 27.9° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Psephosthenaspis pseudobathyurus trilobite zone, Profilbekken Member (Valhallfonna Formation), Whiterockian (470.0 - 457.3 Ma)

• While collections were made throughout section, only ranges of trilobite species are reported. Zone V4a comprises meters 75-100 of the Profilbekken Member. Correlates with part of "zone L" of Ross 1951, Hintze 1951, 1952.

• group of beds-level stratigraphic resolution

Environment/lithology: slope; lithified, gray limestone and breccia

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 106478: authorized by Melanie Hopkins, entered by Melanie Hopkins on 18.03.2011, edited by Mihaela Krause

Creative Commons license: CC BY (attribution)

Taxonomic list

• Graptolites also present (see Fortey and Brunton 1973)
Conodonta
 Belodellida - Belodellidae
? Belodella sp. Ethington 1959 conodont
 Ozarkodinida -
Periodon sp. Hadding 1913 conodont
Trilobita
 Corynexochida - Styginidae
Turgicephalus falcatus Fortey 1980 trilobite
 Proetida - Telephinidae
Carolinites ekphymosus Fortey 1975 trilobite
Carolinites killaryensis Stubblefield 1950 trilobite
 Proetida - Brachymetopidae
Oenonella paulula Fortey 1980 trilobite
 Olenida - Olenidae
Hypermecaspis brevifrons Fortey 1974 trilobite
"Triarthrus parapunctatus" = Porterfieldia parapunctata Fortey 1974 trilobite
 Phacopida - Encrinuridae
Cybelurus brutoni Fortey 1980 trilobite
 Phacopida - Pliomeridae
Evropeites hyperboreus Fortey 1980 trilobite
 Phacopida - Cheiruridae
Parapilekia jacquelinae Fortey 1980 trilobite
 Trinucleida - Raphiophoridae
Ampyxoides inermis Fortey 1975 trilobite
Ampyx toxotis Fortey 1975 trilobite
Rhombampyx tragula Fortey 1975 trilobite
Globampyx trinucleoides Fortey 1975 trilobite
 Asaphida - Nileidae
Nileus orbiculatoides Schrank 1972 trilobite
subspecies svalbardensis
Peraspis erugata Ross 1970 trilobite
Poronileus fistulosus Fortey 1975 trilobite
 Asaphida - Remopleurididae
Robergiella lundehukensis Fortey 1980 trilobite
 Ptychopariida - Shumardiidae
Shumardia acuticaudata Fortey 1980 trilobite