Brachiopod fauna of Hemse bioherm at Ljugarn, LV3: Ludfordian, Sweden
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Trilobita
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Trilobita indet.
Walch 1771
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1 specimen | ||||||
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Gastropoda
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Gastropoda indet.
Cuvier 1795
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1 specimen | ||||||
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Rhynchonellata
- Spiriferida
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Spiriferacea indet.
King 1846
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1 specimen | ||||||
| corrected as Spiriferoidea | |||||||
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Rhynchonellata
- Spiriferida
- Delthyrididae
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Howellella elegans
Muir-Wood 1925
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2 specimens | ||||||
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Rhynchonellata
- Atrypida
- Atrypidae
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Plectatrypa imbricata
(Sowerby and Murchison 1839)
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1 specimen | ||||||
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Rhynchonellata
- Atrypida
- Lissatrypidae
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Lissatrypa sulcata
(Lindström 1861)
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123 specimens | ||||||
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Rhynchonellata
- Atrypida
- Atrypinidae
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Spirigerina aff. quinquecostata
Munthe 1910
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1 specimen | ||||||
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Rhynchonellata
- Rhynchonellida
- Trigonirhynchiidae
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Ancillotoechia cf. bidentata
(Hisinger 1827)
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1 specimen | ||||||
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Strophomenata
- Orthotetida
- Chilidiopsidae
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? Morinorhynchus sp.
Havlicek 1965
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7 specimens | ||||||
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unclassified
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Bryozoa indet.
Ehrenberg 1831
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2 specimens | ||||||
| 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: | 65049 | ||
| Authorizer: | L. Ivany | Enterer: | C. Story | Research group: | marine invertebrate |
| Created: | 2006-09-18 14:46:24 | Last modified: | 2006-09-18 17:46:24 |
| Access level: | the public | Released: | 2006-09-18 14:46:23 |
| 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] |