Bed 58.80-56.68, Fjacka Shale Formation (Ordovician of Sweden)

Where: Vestergotland, Sweden (58.0° N, 12.0° E: paleocoordinates 33.7° S, 8.9° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Fjacka Shale Formation, Caradoc (458.4 - 449.5 Ma)

• Listed as Upper Caradoc

• formation-level stratigraphic resolution

Environment/lithology: deep subtidal shelf; poorly lithified, pyritic, argillaceous shale and lithified, concretionary limestone

• Worm-like trails and speckling (resembles horizontal burrow mottling). Originally called the Black Tretaspis Shale; update in Sheehan, 1979: 64; Double check environment
• Alternating beds of dark, bituminous shale and slightly marly and pyritic, speckled (bioturbated?) gray mudstone and concretionary limestone

Size classes: macrofossils, mesofossils, microfossils

Preservation: replaced with pyrite

Collection methods: 7 cm diameter core sample, but with some vertical averaging; zone of Pleurograptus linearis and Climacograptus styloideus; F1a and F1b age according to Sheehan, 1979: 64

Primary reference: G. Henningsmoen. 1948. The Tretaspis Series of the Kullatorp Core. Bulletin of the Geological Institutions of the University of Uppsala 32:374-432 [P. Novack-Gottshall/P. Hearn/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 76079: authorized by Phil Novack-Gottshall, entered by Paul Hearn on 12.11.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Porifera indet. Grant 1836
Pterobranchia
 Graptoloidea - Climacograptidae
 Graptoloidea - Dicranograptidae
 Graptoloidea - Diplograptidae
"Diplograptus cf. truncatus" = Rectograptus truncatus, "Diplograptus truncatus" = Rectograptus truncatus
"Diplograptus cf. truncatus" = Rectograptus truncatus Lapworth 1876 graptolite
"Diplograptus truncatus" = Rectograptus truncatus Lapworth 1876 graptolite
"pauperatus"
Deuteropoda
  -
Ostracoda indet. Latreille 1802 ostracod
Ostracoda
 Beyrichicopida - Drepanellidae
 Hollinocopida - Oepikiumidae
"Biflabellum vestrogothicum" = Oepikium
"Biflabellum vestrogothicum" = Oepikium ostracod
 Hollinocopida - Euprimitiidae
 Hollinocopida - Tetradellidae
Artiopoda
 Agnostida - Metagnostidae
Trilobita
 Trinucleida - Trinucleidae
Tretaspis seticornis Hisinger 1840 trilobite
"seticornis"
Hyolitha
 Hyolithida - Hyolithidae
Hyolithes sp. d'Eichwald 1840
Originally "Hyolithus"; assumed spelling error
Strophomenata
 Strophomenida - Aegiromenidae
"? Sowerbyella cf. restricta" = Sericoidea restricta
"? Sowerbyella cf. restricta" = Sericoidea restricta Hadding 1913
Jaanusson, 1965: p. 13 placed this specimen in Sericoidea
Rhynchonellata
 Orthida - Orthidae
Orthis bancrofti
Originally "dalmanellid articulate indet."; Sheehan, 1979 notes the dalmanellid is "Orthis bancrofti"
Lingulata
 Lingulida - Paterulidae
 Acrotretida - Acrotretidae
Hisingerella nitens Hisinger 1837
Polychaeta
 Cuniculepadida - Lepidocoleidae
Gastropoda
  -
Gastropoda indet. Cuvier 1795 snail