Bed 60.85-58.80, 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 (460.9 - 449.5 Ma)

• Listed as Upper Caradoc

• formation-level stratigraphic resolution

Environment/lithology: deep subtidal shelf; lithified, gray mudstone

• Worm-like trails and speckling (resembles horizontal burrow mottling). Originally called the Black Tretaspis Shale; update in Sheehan, 1979: 64; Double check environment
• Speckled, gray, slightly marly mudstone

Size classes: macrofossils, mesofossils, microfossils

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 76078: authorized by Phil Novack-Gottshall, entered by Paul Hearn on 12.11.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Corynexochida - Styginidae
Phillipsinella cf. parabola Stormer 1953 trilobite
 Agnostida - Metagnostidae
 Asaphida - Raphiophoridae
Lonchodomas sp. Angelin 1854 trilobite
 Asaphida - Trinucleidae
Tretaspis seticornis Hisinger 1840 trilobite
"seticornis"
Ostracoda
 Beyrichiacea - Eurychilinidae
 Palaeocopida - Drepanellidae
 Palaeocopida -
Bromidella linnarssoni, Jonesina modesta, "Biflabellum vestrogothicum" = Oepikium
"Biflabellum vestrogothicum" = Oepikium ostracod
Strophomenata
 Strophomenida - Aegiromenidae
"? Sowerbyella cf. restricta" = Sericoidea restricta
"? Sowerbyella cf. restricta" = Sericoidea restricta Hadding 1913
Jaanusson, 1965: 13 placed this specimen in Sericoidea
Lingulata
 Lingulida - Paterulidae