USGS core 4A, sample D6709-F (Paleocene of the United States)

Where: Sheridan County, Wyoming (44.9° N, 106.1° W: paleocoordinates 50.6° N, 84.2° W)

• coordinate estimated from map

• hand sample-level geographic resolution

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

• Canyon coal bed.

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: core, 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 more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 236808: authorized by Phillip Jardine, entered by Hannah Morck on 31.10.2024

Creative Commons license: CC BY (attribution)

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
Angiospermae
 Santalales - Loranthaceae
Syncolporites cf. minimus
unclassified
  -
"Tricolpate A." indet., Ulmipollenites "krempii/tricostatus", "Bisaccate pollen" indet.
Angiospermae
 Gunnerales -
Tricolpites hians
unclassified
  -
"Tricolpate fine reticulum" indet., "Taxodiaceae/Cupressaceae" indet., Aesculiidites sp., "Tricolpate B." indet.
Angiospermae
 Malvales - Tiliaceae
Tilia tetraforaminipites
 Fagales - Fagaceae
Quercus explanata
 Cornales - Nyssaceae
Nyssa ingentipollinia
unclassified
  -
Paraalnipollenites cf. confusus
Equisetopsida
 Pinidae - Pinidae
"Corollina sp." = Classopollis
"Corollina sp." = Classopollis Pflug 1953
Pteridopsida
  -
Leiotriletes spp.
Leiotriletes spp. Potonie and Kremp 1954
Bryopsida
  -
Stereisporites spp.
Magnoliopsida
  -
Malvacipollis spp., Periporopollenites sp., "Tricolpites anguloluminosus" = Albertipollenites anguloluminosus
Malvacipollis spp. Harris 1965
Periporopollenites sp. Pflug and Thomson 1953
"Tricolpites anguloluminosus" = Albertipollenites anguloluminosus Archangelsky 1973
Angiospermae
 Fagales - Fagaceae
Cupuliferoipollenites spp.
 Fagales - Juglandaceae
Caryapollenites imparalis, Caryapollenites wodehousei, Caryapollenites veripites, Caryapollenites inelegans, Momipites wyomingensis, Momipites ventifluminis
Caryapollenites imparalis Nichols and Ott 1978
Caryapollenites wodehousei Nichols and Ott 1978
Caryapollenites veripites Wilson and Webster 1946
Caryapollenites inelegans Nichols and Ott 1978
Momipites wyomingensis Nichols and Ott 1978
Momipites ventifluminis Nichols and Ott 1978
 Proteales - Proteaceae
Triporopollenites spp.
Triporopollenites spp. Pflug and Thomson 1953