USGS locality D6765 (Paleocene of the United States)

Where: Powder River County, Montana (45.6° N, 105.7° W)

• Paleocoordinates: 54.0° N, 70.5° W (Wright 2013)

• coordinate estimated from map

• hand sample-level geographic resolution

When: Tongue River Member (Fort Union Formation), Paleocene (66.0 - 56.0 Ma)

• Mackin-Walker coalbed.

Environment/lithology: fluvial; coal

• From Pocknall and Nichols 1996 Figure 2: Meandering fluvial facies.

Size class: microfossils

Preservation: original sporopollenin

Collected by USGS, Denver, Colorado

Collection methods: bulk, chemical, hydrochloric, hydroflouric

• All slides are held in the Denver laboratory of the U.S. Geological Survey.

Primary reference: D. Pocknall. 1986. Palynological data from the Fort Union and Wasatch formations, Powder River basin, Wyoming and Montana. Open-File Report (86-117)more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 236819: authorized by Phillip Jardine, entered by Hannah Morck on 31.10.2024

Creative Commons license: CC0 (CC0)

Taxonomic list

• From Pocknall and Nichols 1996: 'Relative abundance (percentage) data were derived initially on the basis of counts of 200 specimens per sample. Dominance of assemblages from most samples by inaperturate pollen necessitated that these palynomorphs be excluded from our pollen sum in order to evaluate the abundance of the other species. Additional counts were then made until a total of 200 specimens exclusive of inaperturates had been counted for each sample. After completion of counting, slides were scanned and the presence of species not included in the count were recorded.’

•

•Abundance data have been entered here based on the initial counts (i.e. those that included the inaperturate pollen), with abundances from the additional counts included as comments for the relevant taxa. Taxa without abundance data were those recorded as present in the post-count scans.

Show authors, comments, and common names
 Anthophyta -
Aquilapollenites spinulosus
unclassified
  -
"Bisaccate pollen" indet., "Tricolpate/tricolporate" indet., "Taxodiaceae/Cupressaceae" indet., Ulmipollenites "krempii/tricostatus"
Angiospermae
 Fagales - Juglandaceae
Momipites waltmanensis, Momipites wyomingensis, Caryapollenites wodehousei
Momipites waltmanensis Nichols and Ott 1978
Momipites wyomingensis Nichols and Ott 1978
Caryapollenites wodehousei Nichols and Ott 1978
 Fagales - Betulaceae
Alnipollenites verus
Alnipollenites verus Potonie 1931 birch
 Proteales - Proteaceae
Triporopollenites spp.
Triporopollenites spp. Pflug and Thomson 1953
Polypodiopsida
  - Polypodiaceae
Laevigatosporites spp.
Cycadopites
  -
Cycadopites spp.
Cycadopites spp. Wodehouse 1933