St. Mary River tracksite: Late/Upper Campanian - Early/Lower Maastrichtian, Canada
collected by G. Nadon 1986–1987
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Reptilia
- Iguanodontipodidae
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Hadrosauridae indet.
Cope 1869
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| tracks made by 2-4 hadrosaurs. | ||||||||||
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= Hadrosauropodus langstoni n. gen., n. sp.
Lockley et al. 2003
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Lockley et al. 2003 | |||||||||
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Reptilia
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Theropoda indet.
(Marsh 1881)
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1 individual | |||||||||
| tracks made by a small theropod | ||||||||||
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= Coelurosauria indet.
Huene 1914
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Currie and Koppelhus 2015 | |||||||||
| ornithomimid or caenagnathid | ||||||||||
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Reptilia
- Tyrannosauridae
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Tyrannosauridae indet.
Osborn 1906
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1 individual | |||||||||
| tracks | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Canada | State/province: | Alberta | County: | Cardston |
| Coordinates: | 49.4° North, 113.0° West (view map) | ||||
| Paleocoordinates: | 57.3° North, 80.3° West | ||||
| Basis of coordinate: | estimated from map | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
| Key time interval: | Late/Upper Campanian - Early/Lower Maastrichtian | ||
| Age range of interval: | 83.60000 - 66.00000 m.y. ago |
Stratigraphy
| Formation: | St. Mary River |
| Stratigraphic resolution: | bed |
Lithology and environment
| Primary lithology: | gray silty,carbonaceous "shale" |
| Secondary lithology: | very fine sandy siltstone |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: "The section is dominated by light grey shales and siltstones interbedded with moderately well cemented fine-grained sandstones and siltstones." "Three facies associations within the formation are (in increasing order of abundance) lenticular sandstones, sandstone-siltstone sheets, and shales and siltstones. The large lenticular sandstones (>2.5 m) have low width/height ratios (8-40) and do not commonly contain lateral accretion surfaces.The lenses are composed of a thin basal lagoverlain by rooted trough-crossbedded sandstone with minor amounts of parallel lamination and planar tabular crossbeds. The lenses fine upward to rippled, very fine-grained, rooted sandstones and siltstones. Adjoining the tops of the lenses are beds of rooted sandstone and silstone that dip away from the lenses into the adjacent laminated interbedded shales and siltsones." "The most abundant facies within the St. Mary River Formation is dominated by light grey rooted siltstones and dark grey organic-rich siltstones and shales, which are interpreted as marsh and lacustrine sediments, respectively." | |
| Environment: | crevasse splay |
| Geology comments: "Paleocurrent directions in the lens margins and adjoining thin sandstone-siltsone beds are generally perpendicular to the flow indicated by the crossbedding in the centre of the lense."
"The large lenses are interpreted as channels of an anastomosed fluvial system. The margins of the lenses and the beds that dip away from the lenses form a levee-splay complex that flanks the channel." "Smaller lenses composed of medium- to fine-grained trough-crossbedded sandstones occur scattered throughout the formation. These lack the basal lag of the larger lenses. The smaller lenses are interpreted as representing proximal splay channels that emanated from crevasses in the levees." | |
Taphonomy
| Modes of preservation: | cast,mold/impression,trace |
| Degree of concentration: | -multiple events |
| Size of fossils: | macrofossils |
| Spatial orientation: | life position |
| Preservation of anatomical detail: | variable |
| Abundance in sediment: | common |
| Spatial resolution: | autochthonous |
Collection methods and comments
| Collection excludes: | some macrofossils | ||
| Collection methods: | surface (in situ),peel or thin section,field collection,observed (not collected) | ||
| Reason for describing collection: | general faunal/floral analysis | ||
| Collectors: | G. Nadon | Collection dates: | 1986–1987 |
| Taxonomic list comments:Egg shell fragments also reported to be present | |||
Metadata
| Database number: | 167797 | ||
| Authorizer: | M. Carrano | Enterer: | M. Carrano |
| Modifier: | G. Varnham | Research group: | vertebrate |
| Created: | 2015-04-02 15:25:32 | Last modified: | 2022-05-09 04:47:58 |
| Access level: | the public | Released: | 2015-04-02 15:25:32 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 54846. | P. J. Currie, G. C. Nadon, and M. G. Lockley. 1991. Dinosaur footprints with skin impressions from the Cretaceous of Alberta and Colorado. Canadian Journal of Earth Sciences 28:102-115 [M. Carrano/M. Carrano/M. Carrano] |
Secondary references:
| 77956 | P. J. Currie and E. B. Koppelhus. 2015. The significance of the theropod collections of the Royal Tyrrell Museum of Palaeontology to our understanding of Late Cretaceous theropod diversity. Canadian Journal of Earth Sciences 52(8):620-629 [M. Carrano/M. Carrano/M. Carrano] | |
| 68758 | I. Díaz-Martínez, X. Pereda-Suberbiola, F. Pérez-Lorente and J. I. Canudo. 2015. Ichnotaxonomic review of large ornithopod dinosaur tracks: temporal and geographic implications. PLoS 10(2):e0115477:1-50 [M. Carrano/M. Carrano] | |
| 17313 | ETE | M. G. Lockley, G. Nadon, and P. J. Currie. 2003. A diverse dinosaur-bird footprint assemblage from the Lance Formation, Upper Cretaceous, eastern Wyoming; implications for ichnotaxonomy. Ichnos 11:229-249 [M. Carrano/K. Maguire/M. Carrano] |
| 70703 | G. C. Nadon. 1993. The association of anastomosed fluvial deposits and dinosaur tracks, eggs, and nests: implications for the interpretation of floodplain environments and a possible survivial strategy for ornithopods. Palaios 8:31-44 [M. Carrano/M. Carrano] |