Where: Slope County, North Dakota (46.3° N, 103.9° W: paleocoordinates 52.7° N, 76.7° W)
• coordinate estimated from map
• hand sample-level geographic resolution
When: Hell Creek Formation, Maastrichtian (72.1 - 66.0 Ma)
• Sample height relative to Fort Union and Hell Creek formation contact.
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 234586: authorized by Phillip Jardine, entered by Hannah Morck on 25.04.2024
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Tschudypollis spp., Simplicepollis rallus, Zlivisporites novomexicanum, Ericaceoipollenites sp., Dyadonapites reticulatus, Wodehouseia spinata, Toroisporis major, Ulmipollenites krempii, Schizophacus sp., Striatellipollis striatellus, Ghoshispora bella, Kurtzipites trispissatus, Laecigatosporites spp.
| |
Tricolpites microreticulatus | |
"Tricolpites microreticulatus" = Retitricolpites microreticulatus
| |
Inaperturotetradites | |
Aquilapollenites conatus, Aquilapollenites attenuatus, Aquilapollenites collaris, Aquilapollenites quadrilobus
| |
Penetetrapites | |
Penetetrapites sp. Hedlund and Norris 1968 | |
Equisetopsida | |
Inaperturopollenites spp. Potonié 1966 | |
Polypodiopsida | |
Gleicheniidites sp. Dettmann 1963 | |
Pteridopsida | |
Magnoliopsida | |
Rhoipites spp. Wodehouse 1933 | |
Angiospermae | |
| |
Pandaniidites typicus Sweet 1986 | |
Arecipites sp. Nichols et al. 1973 palm | |
Triporopollenites spp. Pflug and Thomson 1953 | |
Chenopodipollis sp. Krutzsch 1966 | |
Pinopsida | |
Pityosporites spp. Seward 1914 | |
Cycadopites | |
Cycadopites spp. Wodehouse 1933 |