Brachiopod fauna of Hemse bioherm at Ljugarn, LR2: Ludfordian, Sweden
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Rhynchonellata
- Atrypida
- Atrypinidae
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Spirigerina aff. quinquecostata
Munthe 1910
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1 specimen | ||||||
Rhynchonellata
- Atrypida
- Lissatrypidae
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Lissatrypa sulcata
(Lindström 1861)
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19 specimens | ||||||
Rhynchonellata
- Orthida
- Dalmanellidae
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Isorthis canaliculata
(Lindström 1861)
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1 specimen | ||||||
recombined as Levenea canaliculata | |||||||
Strophomenata
- Orthotetida
- Chilidiopsidae
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? Morinorhynchus sp.
Havlicek 1965
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20 specimens | ||||||
Gastropoda
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Gastropoda indet.
Cuvier 1795
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1 specimen | ||||||
see common names |
Geography
Country: | Sweden | State/province: | Gotland |
Coordinates: | 57.3° North, 18.7° East (view map) | ||
Paleocoordinates: | 16.6° South, 2.2° West | ||
Basis of coordinate: | based on nearby landmark | ||
Geographic resolution: | small collection |
Time
Period: | Silurian | Epoch: | Ludlow |
Stage: | Ludfordian | 10 m.y. bin: | Silurian 2 |
Key time interval: | Ludfordian | ||
Age range of interval: | 425.60000 - 423.00000 m.y. ago |
Stratigraphy
Formation: | Hemse Beds |
Stratigraphic resolution: | bed |
Lithology and environment
Primary lithology: | shelly/skeletal lithified "limestone" | ||
Secondary lithology: | lithified marl | ||
Includes fossils? | Y | ||
Lithology description: "The Hemse beds are a unit of biohermal limestone, bedded limestone, and marlstone about 100 m thick...At two areas [at Ljugarn] the rocks consist of in-place, coalescing stromatoporoid colonies, forming parallel, irregular layers which dip gently eastward. more extensive, surrounding outcrops contain more non-bedded stromatoporoid debris than in-place colonies. In addition to stromatoporoids, the debris deposits include algae, corals, crinoids, bryozoa, brachiopods, mollucs, trilobites, and ostracodes...[Compositional analysis of limestone given in some detail]." | |||
Environment: | reef, buildup or bioherm | Tectonic setting: | cratonic basin |
Taphonomy
Collection methods and comments
Collection excludes: | some macrofossils |
Reason for describing collection: | paleoecologic analysis |
Collection method comments: This is one of several individual bed collections within 20 meters of one another. | |
Taxonomic list comments:Does not include stromatoporoids, corals, crinoids, algae and microfossils. |
Metadata
Database number: | 65042 | ||
Authorizer: | L. Ivany | Enterer: | C. Story | Research group: | marine invertebrate |
Created: | 2006-09-18 14:43:29 | Last modified: | 2006-09-18 17:43:29 |
Access level: | the public | Released: | 2006-09-18 14:43:28 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
6158. | R. Watkins. 1975. Silurian brachiopods in a stromatoporoid bioherm. Lethaia 8(1):53-61 [M. Foote/M. Foote/M. Foote] |