Zone V4b, 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 glabrior 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 30-100 of the Profilbekken Member. Correlates with part of "zone L" of Ross 1951, Hintze 1951, 1952.

• group of beds-level stratigraphic resolution

Environment/lithology: lithified, glauconitic limestone and lithified, massive reef rocks

• Comprises taxa from shallower, perhaps reef-like environments ("illaenid-cheirurid" community) as well as slope environments ("nileid community")
• Fortey and Brunton 1973 indicate both richly fossiliferous flaggy limestones with glauconitic horizons and massive, bioclastic, algal limestones, sparsely fossiliferous.

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 106480: 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)
Trilobita
 Harpetida - Harpetidae
Scotoharpes aduncus Fortey 1980 trilobite
 Corynexochida - Styginidae
"Raymondaspis vespertinus" = Raymondaspis vespertina Ross and Barnes 1967 trilobite
Turgicephalus hinlopensis Fortey 1980 trilobite
Turgicephalus cf. hinlopensis Fortey 1980 trilobite
 Corynexochida - Illaenidae
Illaenus oscitatus Fortey 1980 trilobite
 Olenida - Olenidae
"Triarthrus parapunctatus" = Porterfieldia parapunctata
"Triarthrus parapunctatus" = Porterfieldia parapunctata Fortey 1974 trilobite
 Phacopida - Encrinuridae
Cybelurus halo Fortey 1980 trilobite
Cybelurus cf. mirus Billings 1865 trilobite
 Phacopida - Pliomeridae
Evropeites hyperboreus Fortey 1980 trilobite
Ectenonotus connemaricus Reed 1909 trilobite
Pliomerops praematura Fortey 1980 trilobite
 Phacopida - Cheiruridae
? Kolymella sp. Chugaeva 1972 trilobite
Sycophantia seminosa Fortey 1980 trilobite
Kawina "sp. A" Barton 1916 trilobite
Kawina "sp. B" Barton 1916 trilobite
Kawina wilsoni Ross 1972 trilobite
 Odontopleurida - Odontopleuridae
Diacanthaspis sp. Whittington 1941 trilobite
 Ptychopariida - Shumardiidae
Shumardia phalloides Fortey 1980 trilobite
 Trinucleida - Raphiophoridae
Globampyx trinucleoides Fortey 1975 trilobite
Rhombampyx rhombos Fortey 1975 trilobite
Endymionia raymondi Whittington 1965 trilobite
 Asaphida - Remopleurididae
Robergiella brevilingua Fortey 1980 trilobite
Remopleurides "sp. A" Portlock 1843 trilobite
 Asaphida - Nileidae
Poronileus vallancei Fortey 1975 trilobite
Poronileus isoteloides Fortey 1975 trilobite
Nileus porosus Fortey 1975 trilobite
Peraspis erugata Ross 1970 trilobite
 Proetida - Dimeropygidae
"? Ischyrophyma borealis" = Ischyrotoma borealis, Ischyrotoma twenhofeli
"? Ischyrophyma borealis" = Ischyrotoma borealis Fortey 1980 trilobite
Ischyrotoma twenhofeli Raymond 1925 trilobite
 Proetida - Telephinidae
Carolinites killaryensis Stubblefield 1950 trilobite
Carolinites sibiricus Chugaeva 1964 trilobite
Carolinites rugosus Fortey 1975 trilobite
 Proetida - Bathyuridae
Bathyuridae indet. Walcott 1886 trilobite
Punka caecata Fortey 1980 trilobite
? Acidiphorus ligo Fortey 1980 trilobite
Acidiphorus brevispicatus Fortey 1980 trilobite
Conodonta
 Ozarkodinida -
Periodon sp. Hadding 1913 conodont