CB9 (1360 ft), Crowsnest River ["Colorado Shale"]: Middle Coniacian, Canada
collected by McLearn
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Ammonitida
- Placenticeratidae
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Placenticeras syrtale
(Morton 1834)
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Cephalopoda
- Ammonitida
- Scaphitidae
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Scaphites ventricosus
Meek and Hayden 1862
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Cephalopoda
- Ammonitida
- Baculitidae
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Baculites cf. asper
Morton 1830
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Bivalvia
- Pholadida
- Pholadidae
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Martesia mcevoyi
McLearn 1929
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Bivalvia
- Pectinida
- Oxytomidae
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Pteria cf. nebrascana
(Evans and Shumard 1857)
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| see common names | |||||||
Geography
| Country: | Canada | State/province: | Alberta |
| Coordinates: | 49.6° North, 114.7° West (view map) | ||
| Paleocoordinates: | 54.3° North, 75.8° West | ||
| Basis of coordinate: | based on nearby landmark | ||
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
| Stage: | Coniacian | 10 m.y. bin: | Cretaceous 6 |
| Key time interval: | Middle Coniacian | Ammonoid zone: | Scaphites ventricosus |
| Age range of interval: | 89.80000 - 86.30000 m.y. ago |
Stratigraphy
| Regional section: | Crowsnest River | Regional bed: | 1360 ft | ||
| Regional order: | bottom to top | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: STRATIGRAPHIC RELATIONS: In the Rocky Mountain Foothills of Alberta the units corresponding to the Colorado Group are the Crowsnest Volcanics, Blackstone Formation, Cardium Formation, and the lower part of the Wapiabi Formation, in order of decreasing age. The Colorado Shale is obsolete as a lithostratigraphic unit in Alberta, but a reliable replacement name for these collections could not be found. AGE: Coniacian, on the basis of ammonite biostratigraphy; Scaphites ventricosus zone. STRATIGRAPHIC POSITION: From 1360 ft above base of section. | |||||
Lithology and environment
| Primary lithology: | concretionary lithified argillaceous "shale" |
| Includes fossils? | Y |
| Lithology description: SPECIFIC LITHOLOGY: Dominantly argillaceous, incorporating subordinate shaly conglomerate, sandstone and siltstone. LITHIFICATION: Lithified, on the basis of figured specimens. | |
| Environment: | marine indet. |
| Geology comments: ENVIRONMENT: Marine siliciclastic. | |
Taphonomy
| Modes of preservation: | body,mold/impression,concretion |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | surface (in situ),field collection |
| Reason for describing collection: | general faunal/floral analysis |
| Museum repositories: | NMC |
| Collectors: | McLearn |
| Collection method comments: COLLECTOR: Not stated, but possibly F. H. McLearn. REPOSITORY: National Museum of Canada. | |
| Taxonomic list comments:COVERAGE: Exhaustive for ammonoids and bivalves. NOMENCLATURE: Supported by authoritative publications, with somewhat antiquated nomenclature, but species resolution. | |
Metadata
| Database number: | 87512 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2009-03-18 12:10:14 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | the public | Released: | 2009-03-18 12:10:14 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 29460. | F. H. McLearn. 1929. Mesozoic Palaeontology of Blairmore Region: Stratigraphic Palaeontology. National Museum of Canada Bulletin 58:80-107 [A. Hendy/A. Hendy] |