Ball's Falls, 0.9 m above base: Llandovery, Canada
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Crinoidea
- Diplobathrida
- Dimerocrinitidae
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Ptychocrinus medinensis
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| see common names | |||||||
Geography
| Country: | Canada | State/province: | Ontario | County: | Lincoln |
| Coordinates: | 43.1° North, 79.4° West (view map) | ||||
| Paleocoordinates: | 24.0° South, 48.3° West | ||||
| Geographic resolution: | small collection |
Time
| Period: | Silurian | Epoch: | Llandovery |
| 10 m.y. bin: | Silurian 1 | ||
| *Period: | Early/Lower Silurian | *Epoch: | Early/Lower Llandovery |
| Key time interval: | Llandovery | ||
| Age range of interval: | 443.80000 - 433.40000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Cabot Head | Local bed: | 0.9 m | ||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: 0.9 m above base of formation | |||||
Lithology and environment
| Primary lithology: | gray,green poorly lithified calcareous siltstone |
| Secondary lithology: | sandstone |
| Environment: | prodelta |
| Geology comments: "Dark gray to green, fissile, calcareous to arenaceous shale and siltstone and interbedded light gray to green, fine- to med-grained calcareous sandstone....considered to be prodeltaic facies of the Cabot Head." | |
Taphonomy
| Modes of preservation: | body |
Collection methods and comments
| Collection excludes: | some macrofossils |
| Collection methods: | surface (in situ),mechanical,field collection |
| Reason for describing collection: | taxonomic analysis |
| Taxonomic list comments:Crinoids only. | |
Metadata
| Database number: | 3487 | ||
| Authorizer: | J. Alroy | Enterer: | M. Sommers | Research group: | marine invertebrate |
| Created: | 1999-08-02 18:45:40 | Last modified: | 1999-08-02 21:45:40 |
| Access level: | the public | Released: | 2000-11-20 13:53:19 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 200. | J. D. Eckert. 1984. Early Llandovery crinoids and stelleroids from the Cataract Group (Lower Silurian) in southern Ontario, Canada. Royal Ontario Museum Life Sciences Contributions 137:1-63 [J. Alroy/M. Sommers/M. Uhen] |