Norderstrand, 600-1000 m northeast of the northern town wall of Visby (Silurian of Sweden)

Also known as Nuculoid bivalves of the Lower Visby Beds

Where: Gotland, Sweden (57.7° N, 18.3° E: paleocoordinates 24.1° S, 3.4° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Pterospathodus amorphognathoides conodont zone, A Member (Lower Visby Formation), Telychian (438.5 - 433.4 Ma)

• Was given as Telychian - Sheinwoodian, but Lower Visby is Telychian (PJW6).

• group of beds-level stratigraphic resolution

Environment/lithology: offshore ramp; lime mudstone and marl

• SEP: Silurian of Gotland has been variably described as a ramp and platform. Based on my read of the literature, I think if falls best into the ramp category. From Samtleben et al. (1996). Geol. Rundsch 85:278-292; "The Lower Visby Beds consist of micritic limestones and marls, without transported and sorted detrital material, accumulated well below the wave base and photic zone; only weak water movements touched the bottom."
• see geology

Size class: macrofossils

Reposited in the SM

Primary reference: L. Liljedahl. 1994. Silurian nuculoid and modiomorphid bivalves from Sweden. Fossils and Strata (33)1-89 [M. Foote/M. Foote/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 13638: authorized by Michael Foote, entered by Michael Foote on 16.04.2002, edited by Pete Wagner and Björn Kröger

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Bivalvia
 Nuculida - Praenuculidae
Nuculodonta gotlandica
Nuculodonta gotlandica Liljedahl 1983 clam
Strophomenata
 Strophomenida - Rafinesquinidae
"Leptaena depressa" = Leptaena (Leptaena) depressa, Leptaena sperion
"Leptaena depressa" = Leptaena (Leptaena) depressa Sowerby 1824
Leptaena depressa visbyensis
Leptaena sperion Bassett 1977