PTRM V95018 (Silty Mudstone): Maastrichtian, North Dakota
collected 1996 - 2000

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Erlingdorfia montana leaf
Angiospermae - Fagales - Nothofagaceae
"Dryophyllum" tennessensis leaf
"Dryophyllum" subfalcatum leaf Lesquereux 1875
Angiospermae - Rosales - Rhamnaceae
"Rhamnus" cleburni leaf Lesquereux 1872
Angiospermae - Laurales - Lauraceae
Marmarthia trivalis leaf
Coniferales - Cupressaceae
Sequoia sp. leaf Endlicher 1847
Reptilia - Testudines - Kinosternoidea
Hoplochelys clark n. sp. Knauss et al. 2011
(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]