Graptolites of the Monograptus acinaces Zone on Bornholm (exposures) (Silurian of Denmark)

Where: Bornholm, Denmark (55.1° N, 14.7° E: paleocoordinates 30.7° S, 5.0° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Rhuddanian (443.4 - 440.8 Ma)

Environment/lithology: marine; lithified, gray, calcareous shale and lithified, concretionary limestone

• Sequence is found in a series of fault blocks, cropping out along Laesa and Olea riviulets and also known from wells.
• For overall sequence: "The sequence is mainly developed as dark grey, graptolitic shales interbedded with thin limestone bands."

•For this Zone: "In the lower part of the exposed section of the zone grey, finely laminated and carbonate rich shale is found at (O3), an old limestone quarry. The shale is here interbedded with grey, non-graptolitiferous, concretionary limestone bands, up to 0.5 m in thickness...AT higher levels in the zone (O4) the limestone is present in the form of nodules, about 1 m in diameter and 0.5 m in thickness. In the interbedded shales and in the shales overlying the limestone lenses the graptolites are frequent and occasionally preserved in low relief."

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 13707: authorized by Michael Foote, entered by Michael Foote on 19.04.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Pterobranchia
 Graptoloidea - Climacograptidae
 Graptoloidea - Normalograptidae
Rhaphidograptus toernquisti Elles and Wood 1906 graptolite
"Climacograptus rectangularis" = Normalograptus rectangularis McCoy 1874 graptolite
 Graptoloidea - Dimorphograptidae
 Graptoloidea - Monograptidae
"Monograptus acinaces" = Huttagraptus acinaces
"Monograptus acinaces" = Huttagraptus acinaces Törnquist 1899 graptolite
 Graptoloidea - Retiolitidae
Glyptograptus tamariscus Nicholson 1868 graptolite