PTRM V95018 (Silty Mudstone): Maastrichtian, North Dakota
collected 1996 - 2000
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
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Erlingdorfia montana leaf
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Angiospermae
- Fagales
- Nothofagaceae
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"Dryophyllum" tennessensis leaf
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"Dryophyllum" subfalcatum leaf
Lesquereux 1875
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Angiospermae
- Rosales
- Rhamnaceae
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"Rhamnus" cleburni leaf
Lesquereux 1872
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Angiospermae
- Laurales
- Lauraceae
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Marmarthia trivalis leaf
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Coniferales
- Cupressaceae
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Sequoia sp. leaf
Endlicher 1847
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Reptilia
- Testudines
- Kinosternoidea
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Hoplochelys clark n. sp.
Knauss et al. 2011
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(1 measurement) | ||||||||||
see common names |
Geography
Country: | United States | State/province: | North Dakota | County: | Slope |
Coordinates: | 46.5° North, 104.0° West (view map) | ||||
Paleocoordinates: | 52.9° North, 77.0° West | ||||
Basis of coordinate: | based on nearby landmark | ||||
Altitude: | 852 meters | ||||
Geographic resolution: | small collection |
Time
Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
Stage: | Maastrichtian | 10 m.y. bin: | Cretaceous 8 |
Key time interval: | Maastrichtian | ||
Age range of interval: | 72.10000 - 66.00000 m.y. ago |
Stratigraphy
Formation: | Hell Creek | ||||
Local section: | Cannonball Creek | Local bed: | 21.10 m | ||
Local order: | top to bottom | ||||
Stratigraphic resolution: | group of beds | ||||
Stratigraphy comments: "200 cm thick" and "21.10 m below the pollen-defined K/T boundary" |
Lithology and environment
Primary lithology: | planar lamination silty mudstone |
Includes fossils? | Y |
Lithology description: "silty mudstone deposit with thin siltstone laminae representing the adjacent floodplain" relative to an underlying channel; "the lower part... is 65 cm thick and preserves mud balls along its contact with the sandstone deposit below" | |
Environment: | "floodplain" |
Geology comments: "The presence of these mud balls indicates an incising current causing stream margin erosion of the flood plain and bank cave-off. This mudstone also represents the adjacent floodplain and preserves leaf impressions... within the silty laminae" |
Taphonomy
Modes of preservation: | adpression |
Degree of concentration: | dispersed |
Size of fossils: | macrofossils |
Collection methods and comments
Collection methods: | field collection |
Reason for describing collection: | taxonomic analysis | Collection dates: | 1996 - 2000 |
Collection method comments: PTRM collection |
Metadata
Database number: | 99589 | ||
Authorizer: | J. Alroy | Enterer: | J. Alroy | Research group: | paleobotany |
Created: | 2010-11-16 11:11:35 | Last modified: | 2010-11-15 18:11:35 |
Access level: | the public | Released: | 2010-11-16 11:11:35 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
34252. | G. E. Knauss, W. G. Joyce, T. R. Lyson and D. Pearson. 2011. A new kinosternoid from the Late Cretaceous Hell Creek Formation of North Dakota and Montana and the origin of the Dermatemys mawii lineage. Palaeontologische Zeitschrift 85:125-142 [J. Alroy/J. Alroy/M. Carrano] |