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)