Arisaig 6-12: Llandovery, Canada
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bivalvia
- Modiomorphida
- Modiomorphidae
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Modiolopsis rossonia
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8 %-specimens | |||||||||
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Bivalvia
- Nuculanida
- Cucullellidae
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Nuculites caweri
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8 %-specimens | |||||||||
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Tentaculitida
- Tentaculitidae
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Tentaculites canadensis
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8 %-specimens | |||||||||
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Rhynchonellata
- Rhynchonellida
- Leptocoeliidae
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Eocoelia hemisphaerica
(Sowerby 1839)
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5 %-specimens | |||||||||
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Rhynchonellata
- Orthida
- Draboviidae
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Salopina conservatrix
(McLearn 1924)
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8 %-specimens | |||||||||
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Lingulata
- Lingulida
- Lingulidae
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Lingula sp.
Bruguiére 1797
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50 %-specimens | |||||||||
| "spp." | ||||||||||
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Hyolithida
- Hyolithidae
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Hyolithes forbesi
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5 %-specimens | |||||||||
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Crinoidea
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Crinoidea indet.
Miller 1821
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8 %-elements | |||||||||
| crinoid ossicles | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Canada | State/province: | Nova Scotia | County: | Antigonish |
| Coordinates: | 45.6° North, 62.0° West (view map) | ||||
| Paleocoordinates: | 38.1° South, 32.1° West | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Geographic resolution: | small collection |
Time
| Period: | Silurian | Epoch: | Llandovery |
| 10 m.y. bin: | Silurian 1 | *Epoch: | Middle Llandovery - Late/Upper Llandovery |
| Key time interval: | Llandovery | ||
| Age range of interval: | 443.80000 - 433.40000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Ross Brook | Member: | middle | ||
| Local section: | 6 | Local bed: | 12 | ||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Middle to late Llandovery. | |||||
Lithology and environment
| Primary lithology: | wave ripples,bioturbation,gray lithified silty "shale" |
| Environment: | offshore |
| Geology comments: ~20 m thick "depletion zone" where fossils become much more scarse. Sedimentology: bioturbated mudstones grade upward to bioturbated siltstones, with storm-related siltstone beds increasing in frequency. | |
Taphonomy
| Modes of preservation: | body |
Collection methods and comments
| Collection methods: | surface (in situ),mechanical,field collection |
| Reason for describing collection: | paleoecologic analysis |
| Taxonomic list comments:Ichnofossils: Chondrites, Planolites, Palaeophycus, Helminthopsis. Faunal count: 40. | |
Metadata
| Database number: | 3045 | ||
| Authorizer: | J. Alroy | Enterer: | M. Sommers |
| Modifier: | C. Visaggi | Research group: | marine invertebrate |
| Created: | 1999-07-23 16:03:01 | Last modified: | 2004-03-11 16:25:04 |
| Access level: | the public | Released: | 2000-11-20 13:53:17 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 134. | J. M. Hurst and R. K. Pickerill. 1986. The relationship between sedimentary facies and faunal associations in the Llandovery siliclastic Ross Brook Formation, Arisaig, Nova Scotia. Canadian Journal of Earth Science 23:705-726 [J. Alroy/M. Sommers/A. Clement] |