Graptolites of the Monograptus spiralis Zone on Bornholm (Silurian of Denmark)

Where: Bornholm, Denmark (55.1° N, 14.7° E: paleocoordinates 27.2° S, 4.2° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Telychian (438.5 - 433.4 Ma)

• Bjerreskov says this zone is equivalent to crenulatus Zone in Britain.

Environment/lithology: marine; lithified, gray shale and lithified, gray, green, argillaceous, silty shale

• "[in lower part] shales are grey....Towards the middle of the zone the shales become grey-green, argillaceous to silty, and non-fossiliferous. Only a few bands of dark shales with sparse graptolites occur..."

Primary reference: M. Bjerreskov. 1975. Llandoverian and Wenlockian graptolites from Bornholm. Fossils and Strata (8)1-93 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 13714: authorized by Michael Foote, entered by Michael Foote on 19.04.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Pterobranchia
 Graptoloidea - Cyrtograptidae
 Graptoloidea - Retiolitidae
? Retiolites ? geinitzianus Barrande 1850 graptolite
 Graptoloidea - Monograptidae
Monograptus denudatus n. sp. graptolite
Monograptus priodon Bronn 1835 graptolite
"Monograptus spiralis" = Oktavites spiralis Geinitz 1842 graptolite