Halla Beds Brachiopods: Homerian, Sweden
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
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Leptaenioidea silurica
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Strophomenata
- Strophomenida
- Furcitellidae
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Pentlandina loveni
(Verneuil 1848)
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Strophomenata
- Strophomenida
- Strophochonetidae
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Protochonetes minimus
(Sowerby 1839)
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Strophomenata
- Strophomenida
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Strophochonetes cingulatus
(Lindström 1861)
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Strophomenata
- Orthotetida
- Triplesiidae
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Plectotreta lindstroemi
Ulrich and Cooper 1936
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Strophomenata
- Orthotetida
- Chilidiopsidae
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Morinorhynchus adnatus
(Hedström 1917)
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Orthotetes adnata | |||||||
Chileata
- Dictyonellida
- Eichwaldiidae
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Dictyonella capewellii
(Davidson 1848)
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recombined as Eodictyonella capewellii | |||||||
Rhynchonellata
- Spiriferida
- Cyrtiidae
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Eospirifer radiatus
(Sowerby 1834)
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Cyrtia exporrecta
(Wahlenberg 1818)
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recombined as Cyrtia exporrectus | |||||||
Rhynchonellata
- Spiriferida
- Delthyrididae
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Howellella elegans
Muir-Wood 1925
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Rhynchonellata
- Spiriferida
- Cyrtinopsidae
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Kozlowskiellina deltidialis
(Hedstrom 1923)
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Rhynchonellata
- Athyridida
- Rhynchospirinidae
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Homoeospira baylei
(Davidson 1848)
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Rhynchonellata
- Athyridida
- Meristellidae
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Whitfieldella sp.
Hall and Clarke 1893
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Meristina obtusa
(Dalman 1828)
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Rhynchonellata
- Rhynchonellida
- Hebetoechiidae
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Sphaerirhynchia spp.
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Rhynchonellata
- Rhynchonellida
- Trigonirhynchiidae
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? Microsphaeridiorhynchus nucula
(Sowerby 1839)
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Rhynchotreta cuneata
(Dalman 1828)
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? Ancillotoechia ? bidentata
(Hisinger 1827)
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Rhynchonellata
- Pentamerida
- Gypidulidae
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Gypidula galeata
(Dalman 1828)
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Rhynchonellata
- Pentamerida
- Pentameridae
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Pentamerus gothlandicus
Lebedev 1892
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Rhynchonellata
- Orthida
- Dalmanellidae
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? Isorthis ? crassa
(Lindström 1861)
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Rhynchonellata
- Orthida
- Rhipidomellidae
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Dalejina hybrida
(Sowerby 1839)
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Rhynchonellata
- Atrypida
- Atrypidae
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Atrypa reticularis
(Linnaeus 1758)
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original and current combination Anomia reticularis | |||||||
Rhynchonellata
- Atrypida
- Lissatrypidae
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Glassia obovata
(Sowerby 1839)
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recombined as Lissatrypa obovata | |||||||
see common names |
Geography
Country: | Sweden | State/province: | Gotland |
Coordinates: | 57.5° North, 18.4° East (view map) | ||
Paleocoordinates: | 19.7° South, 2.6° West | ||
Basis of coordinate: | based on political unit | ||
Geographic resolution: | local area |
Time
Period: | Silurian | Epoch: | Wenlock |
Stage: | Homerian | 10 m.y. bin: | Silurian 2 | *Epoch: | Late/Upper Wenlock |
Key time interval: | Homerian | ||
Age range of interval: | 430.50000 - 427.40000 m.y. ago | ||
* legacy (obsolete) database fields |
Stratigraphy
Formation: | Halla Beds | ||||
Stratigraphic resolution: | group of beds | ||||
Stratigraphy comments: Correlation from Jeppsson (1983), Fossils and Strata 15:128 |
Lithology and environment
Primary lithology: | bioturbation argillaceous "limestone" |
Secondary lithology: | ooidal "limestone" |
Lithology description: 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..." | |
Environment: | marine indet. |
Taphonomy
Collection methods and comments
Reason for describing collection: | taxonomic analysis |
Metadata
Database number: | 13528 | ||
Authorizer: | M. Foote | Enterer: | M. Foote |
Modifier: | M. Foote | Research group: | marine invertebrate |
Created: | 2002-04-12 09:00:37 | Last modified: | 2006-09-15 15:15:11 |
Access level: | the public | Released: | 2002-04-12 09:00:37 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
6126. | M. G. Bassett and L. R. M. Cocks. 1974. A review of Silurian brachiopods from Gotland. Fossils and Strata (3)1-56 [M. Foote/M. Foote/M. Foote] |
Secondary references:
11073 | C. Samtleben, A. Munnecke, T. Bickert and J. Paetzold. 1996. The Silurian of Gotland (Sweden): facies interpretation based on stable isotopes in brachiopod shells. Geologische Rundschau 85:278-292 [M. Foote/M. Foote/M. Foote] |