Halla Beds: Fossils of crinoid limestone (Manten 1971, Table IX) (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)
• Correlation based on Jeppsson (1983), Fossils and Strata 15:128.
• group of beds-level stratigraphic resolution
Environment/lithology: marine; 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: A. A. Manten. 1971. Silurian Reefs of Gotland. Developments in Sedimentology 13:1-539 [M. Foote/M. Foote/P. Wagner]more details
Purpose of describing collection: paleoecologic analysis
PaleoDB collection 13600: authorized by Michael Foote, entered by Michael Foote on 15.04.2002
Creative Commons license: CC BY (attribution)
Taxonomic list
• Algae also included.
Show authors, comments, and common names
Stromatoporoidea | |
Stromatoporoidea indet. stromatoporoid sponge | |
Labechia conferta Lonsdale 1839 stromatoporoid sponge | |
Anthozoa | |
Anthozoa indet. Ehrenberg 1834 | |
Crinoidea | |
Crinoidea indet. Miller 1821 Sea lily | |
Gastropoda | |
Rothpletzia sp. Simonelli 1890 hoof shell | |
Craniata | |
Rhynchonellata | |
Gypidula galeata Dalman 1828 | |
Resserella sp. Bancroft 1928 | |
"Platystrophia biforata" = Platystrophia biforatus
"Platystrophia biforata" = Platystrophia biforatus Schlotheim 1820 | |
Eospirifer radiatus Sowerby 1834 | |
Delthyris elevata Dalman 1828 | |
Atrypa reticularis Linnaeus 1758 | |
"Camarotoechia borealis" = Stegerhynchus borealis
"Camarotoechia borealis" = Stegerhynchus borealis Buch 1834 | |
Rhynchotreta cuneata Dalman 1828 | |
Strophomenata | |
"Strophomena rugata" = Leptaenoidea rugata
| |
Leptaena rhomboidalis Wahlenberg 1818 | |
Bryozoa | |
Bryozoa indet. Ehrenberg 1831 | |
Stenolaemata | |
Fenestella sp. Lonsdale 1839 | |
Ptilodictya lanceolata Goldfuss 1829 | |
Trilobita | |
Proetus sp. Steininger 1831 trilobite | |
Encrinurus punctatus Wahlenberg 1821 trilobite | |
Deuteropoda | |
Ostracoda indet. Latreille 1802 ostracod | |
Ostracoda | |
Craspedobolbina clavata ostracod |