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: Fort Union Formation, Maastrichtian (72.1 - 66.0 Ma)
• Sample height relative to Fort Union and Hell Creek formation contact. 5 cm below the K/Pg boundary.
Environment/lithology: "floodplain"; 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 234576: authorized by Phillip Jardine, entered by Hannah Morck on 25.04.2024
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Cycadopites | |
Cycadopites spp. Wodehouse 1933 | |
Lycopodiopsida | |
Hamulatisporis hamulatis clubmoss | |
Bryopsida | |
Stereisporites spp. Pflug 1953 | |
Algae | |
Tetraporina sp. Naumova 1950 | |
Angiospermae | |
Arecipites sp. Nichols et al. 1973 palm | |
Pandaniidites typicus Sweet 1986 | |
| |
Triporopollenites spp. Pflug and Thomson 1953 | |
Magnoliopsida | |
Rhoipites spp. Wodehouse 1933 | |
Taxodiaceaepollenites spp. Kremp 1958 | |
Pinopsida | |
Pityosporites spp. Seward 1914 | |
Pteridopsida | |
unclassified | |
"Polypodiophyta ("3-29") sp." = Pteridophyta
"Polypodiophyta ("3-29") sp." = Pteridophyta Haeckel 1875 | |
Polypodiopsida | |
Gleicheniidites sp. Dettmann 1963 | |
Cicatricosisporites spp. Potonie and Gelletich 1933 | |
Equisetopsida | |
Inaperturopollenites spp. Potonié 1966 | |
| |
Penetetrapites | |
Penetetrapites sp. Hedlund and Norris 1968 |