USGS core 2A, sample D6707-BB (Eocene of the United States)

Where: Sheridan County, Wyoming (44.7° N, 106.2° W: paleocoordinates 47.6° N, 93.2° W)

• coordinate estimated from map

• hand sample-level geographic resolution

When: Wasatch Formation, Eocene (56.0 - 33.9 Ma)

• Arvada coal bed.

Environment/lithology: fluvial; coal

• From Pocknall and Nichols 1996 Figure 2: Anastomosed 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 (86-117)more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 236731: authorized by Phillip Jardine, entered by Hannah Morck on 24.10.2024

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
 Buxales - Buxaceae
Erdtmanipollis pachysandroides
unclassified
  -
"Tricolpate A." indet., Pistillipollenites mcgregorii, "Tricolpate/tricolporate" indet.
Angiospermae
 Cornales - Nyssaceae
Nyssa ingentipollinia
 Mesangiosperms - Araceae
Pandaniidites radicus
unclassified
  -
Polyatriopollenites vermontensis, "Bisaccate pollen" indet.
Angiospermae
 Gunnerales -
Tricolpites hians
unclassified
  -
Ulmipollenites "krempii/tricostatus", "Taxodiaceae/Cupressaceae" indet.
Polypodiopsida
  - Polypodiaceae
Laevigatosporites spp.
Pteridopsida
  -
Leiotriletes spp.
Leiotriletes spp. Potonie and Kremp 1954
Cycadopites
  -
Cycadopites spp.
Cycadopites spp. Wodehouse 1933
Equisetopsida
 Pinidae - Pinidae
"Corollina sp." = Classopollis
"Corollina sp." = Classopollis Pflug 1953
Magnoliopsida
  -
"Tricolpites anguloluminosus" = Albertipollenites anguloluminosus
"Tricolpites anguloluminosus" = Albertipollenites anguloluminosus Archangelsky 1973
Angiospermae
 Fagales - Juglandaceae
Caryapollenites inelegans, Caryapollenites veripites, Momipites wyomingensis
Caryapollenites inelegans Nichols and Ott 1978
Caryapollenites veripites Wilson and Webster 1946
Momipites wyomingensis Nichols and Ott 1978
Dicotyledoneae
 Ericales - Ericaceae
Ericipites sp.
Ericipites sp. Wodehouse 1933 heather
Angiospermae
 Proteales - Proteaceae
Triporopollenites spp.
Triporopollenites spp. Pflug and Thomson 1953
 Mesangiosperms - Liliaceae
Liliacidites spp.
Liliacidites spp. Couper 1953