Nuculoid and Modiomorphid bivalves of the Halla Beds (Silurian of Sweden)
Where: Gotland, Sweden (57.5° N, 18.4° E: paleocoordinates 19.7° S, 2.6° W)
• coordinate based on political unit
• local area-level geographic resolution
When: Halla Beds Formation, Homerian (430.5 - 427.4 Ma)
• group of beds-level stratigraphic resolution
Environment/lithology: marine; bioturbated, argillaceous limestone and ooidal limestone
• Ref. 11073: "Halla Beds (15m): In the eastern part of Gotland a series of shallow marine sediments was deposited on a discontinuity plane. Pure oolites at the base are overlain by bioturbated argillaceous limestones with an abundant but impoverished marine fauna, indicating marginal marine to lagoonal conditions. These limestones grade into conglomeratic oncolites which are interrupted by evenly abraded hardgrounds..."
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 13643: authorized by Michael Foote, entered by Michael Foote on 16.04.2002
Creative Commons license: CC BY (attribution)
Taxonomic list
Show authors, comments, and common names
| Bivalvia | |
|
Modiolopsis alvae Liljedahl 1994 clam
Goniophora onyx clam | |
|
Palaeostraba baltica clam
Caesariella lindensis Soot-Ryen 1964 clam | |
|
Nuculodonta gotlandica Liljedahl 1983 clam | |
|
Nuculoidea lens nut clam | |