CH 35, Cow Head Peninsula [Shallow Bay Fm]: Dresbachian, Canada
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Agnostida
- Diplagnostidae
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Nahannagnostus logani
Pratt 1992
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| see common names | |||||||
Geography
| Country: | Canada | State/province: | Newfoundland and Labrador |
| Coordinates: | 49.9° North, 57.8° West (view map) | ||
| Paleocoordinates: | 6.9° North, 86.4° West (Wright 2013) |
Time
| Period: | Cambrian | Epoch: | Furongian |
| 10 m.y. bin: | Cambrian 5 | ||
| *Period: | Middle Cambrian - Late/Upper Cambrian | *Epoch: | Early/Lower Merioneth - Middle Merioneth |
| *International age/stage: | Early/Lower Maentwrogian - Middle Maentwrogian | *Local age/stage: | Late/Upper Marjuman |
| Key time interval: | Dresbachian | Trilobite zone: | Crepicephalus |
| Age range of interval: | 497 - 485.4 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Geological group: | Cow Head | Formation: | Shallow Bay | Member: | Downes Point (lower) |
| Stratigraphy comments: Kindle Zone 5 (preliminary, agnostoid-based evaluation by co-author) JA: correlates with Utah zones (see Fig. 6) that are entirely Middle Cambrian according to Gradstein et al. 2004. AGE: Dresbachian; refined by A. Hendy (6/2009) on the basis of biostratigraphic data (= Crepicephalus zone). | |||||
Lithology and environment
| Primary lithology: | shelly/skeletal lithified packstone |
| Secondary lithology: | lithified grainstone |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: member: coarse grained sequence of often amalgamated carbonate conglomerates. Specimens: equant casts of light-colored, bioclastic packstones and grainstones. | |
| Environment: | offshore shelf |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection excludes: | some macrofossils |
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: Specimens from boulders | |
| Taxonomic list comments:Only includes trilobites and no other macrofossils from the Cow Head Group. | |
Metadata
| Database number: | 9700 | ||
| Authorizer: | M. Patzkowsky | Enterer: | P. Borkow |
| Modifier: | M. Clapham | Research group: | marine invertebrate |
| Created: | 2001-01-11 12:01:00 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2001-01-11 12:01:00 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 840. | S. R. Westrop, R. Ludvigsen, and C. H. Kindle. 1996. Marjuman (Cambrian) agnostoid trilobites of the Cow Head Group, western Newfoundland. Journal of Paleontology 70(5):804-829 [M. Patzkowsky/P. Borkow/P. Wagner] |