Where: Slope County, North Dakota (46.3° N, 103.9° W: paleocoordinates 52.7° N, 76.7° W)
• coordinate estimated from map
• outcrop-level geographic resolution
When: Hell Creek Formation, Maastrichtian (72.1 - 66.0 Ma)
• Sample height relative to Fort Union and Hell Creek formation contact. #170 was sampled in the uppermost five meters of the Hell Creek formation.
Environment/lithology: "floodplain"; silty mudstone
Size class: microfossils
Preservation: original sporopollenin
Collection methods: bulk, chemical, hydrochloric, hydroflouric
• Samples were collected in the freshly excavated stratigraphic sections. Visible cracks were avoided when sampling to prevent cross contamination between lithological units. Samples were sent to Global GeoLabs Ltd. in Canada for preparation, where standard processing allowed for reliable quantitative work and comparisons between samples. Slides were analyzed using the microscope at the Palaeobotany Department of the Muséum National d'Histoire Naturelle in Paris.
Primary reference: A. Bercovici, D. Pearson, D. Nichols and J. Wood. 2009. Biostratigraphy of selected K/T boundary sections in southwestern North Dakota, USA: toward a refinement of palynological identification criteria. Cretaceous Research 30:632-658 [P. Jardine/H. Morck]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 234572: authorized by Phillip Jardine, entered by Hannah Morck on 25.04.2024
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Polycingulatisporites | |
Polycingulatisporites sp. Simoncsics and Kedves 1961 | |
Polypodiopsida | |
Gleicheniidites sp. Dettmann 1963 | |
Pteridopsida | |
Bryopsida | |
Stereisporites spp. Pflug 1953 | |
Algae | |
Cycadopites | |
Cycadopites spp. Wodehouse 1933 | |
Lycopodiopsida | |
Hamulatisporis amplus clubmoss
Hamulatisporis hamulatis clubmoss | |
Retitriletes sp. Pierce 1961 clubmoss | |
Equisetopsida | |
Inaperturopollenites spp. Potonié 1966 | |
| |
Penetetrapites | |
Penetetrapites sp. Hedlund and Norris 1968 | |
Magnoliopsida | |
Rhoipites spp. Wodehouse 1933 | |
Angiospermae | |
Tricolpites spp. Couper 1953 | |
| |
Arecipites sp. Nichols et al. 1973 palm | |
Pinopsida | |
Pityosporites spp. Seward 1914 |