Where: Bowman County, North Dakota (46.0° N, 103.8° W: paleocoordinates 51.7° N, 79.6° W)
• coordinate estimated from map
• hand sample-level geographic resolution
When: Fort Union Formation, Danian (66.0 - 61.6 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 234627: authorized by Phillip Jardine, entered by Hannah Morck on 25.04.2024
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Chlorophyceae | |
Pediastrum sp. Meyen 1829 | |
Polypodiopsida | |
Gleicheniidites sp. Dettmann 1963 | |
Pteridopsida | |
Deltoidospora sp. Miner 1935
Cyathidites spp. Couper 1953 | |
Bryopsida | |
Stereisporites spp. Pflug 1953 | |
Algae | |
Cycadopites | |
Cycadopites spp. Wodehouse 1933 | |
Equisetopsida | |
Inaperturopollenites spp. Potonié 1966 | |
Penetetrapites | |
Penetetrapites sp. Hedlund and Norris 1968 | |
Tricolpites microreticulatus | |
"Tricolpites microreticulatus" = Retitricolpites microreticulatus
| |
Angiospermae | |
Discoidites parvistriatus mallow | |
Tricolpites spp. Couper 1953 | |
Triporopollenites spp. Pflug and Thomson 1953 | |
Arecipites sp. Nichols et al. 1973 palm | |
Pandaniidites typicus Sweet 1986 | |
Taxodiaceaepollenites spp. Kremp 1958 | |
Pinopsida | |
Pityosporites spp. Seward 1914 |