USGS core 2A, sample D6707-AA (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 236777: authorized by Phillip Jardine, entered by Hannah Morck on 30.10.2024

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
Pteridopsida
  -
Reticuloidosporites pseudomurii
Angiospermae
 Cornales - Nyssaceae
Nyssa ingentipollinia
unclassified
  -
"Bisaccate pollen" indet.
Angiospermae
 Mesangiosperms - Arecaceae
Arecipites cf. tenuiexinous
unclassified
  -
Polyatriopollenites vermontensis, Ulmipollenites "krempii/tricostatus", "Tricolpate/tricolporate" indet., "Tricolpate B." indet.
Angiospermae
 Santalales - Loranthaceae
Syncolporites cf. minimus
 Gunnerales -
Tricolpites hians
unclassified
  -
"Taxodiaceae/Cupressaceae" indet., Pistillipollenites mcgregorii
Angiospermae
 Mesangiosperms - Araceae
Pandaniidites radicus
Polypodiopsida
  - Osmundaceae
Baculatisporites sp.
Baculatisporites sp. Thomson and Pflug 1953
A further 1 specimens were recorded in the additional count
  - Gleicheniaceae
Gleicheniidites sp.
Gleicheniidites sp. Dettmann 1963
  - Polypodiaceae
Laevigatosporites spp.
Pteridopsida
  -
Leiotriletes spp.
Leiotriletes spp. Potonie and Kremp 1954
Bryopsida
  -
Stereisporites spp.
Cycadopites
  -
Cycadopites spp.
Cycadopites spp. Wodehouse 1933
Equisetopsida
 Pinidae - Pinidae
? Araucariacites sp., "Corollina sp." = Classopollis
? Araucariacites sp. Cookson and Couper 1953
"Corollina sp." = Classopollis Pflug 1953
Magnoliopsida
  -
"Tricolpites anguloluminosus" = Albertipollenites anguloluminosus, Periporopollenites sp.
"Tricolpites anguloluminosus" = Albertipollenites anguloluminosus Archangelsky 1973
Periporopollenites sp. Pflug and Thomson 1953
Angiospermae
 Fagales - Juglandaceae
Caryapollenites inelegans, Caryapollenites veripites, Caryapollenites imparalis, Momipites wyomingensis, Momipites amplus, Momipites ventifluminis
Caryapollenites inelegans Nichols and Ott 1978
Caryapollenites veripites Wilson and Webster 1946
Caryapollenites imparalis Nichols and Ott 1978
Momipites wyomingensis Nichols and Ott 1978
Momipites amplus Leffingwell 1971
Momipites ventifluminis Nichols and Ott 1978
 Fagales - Betulaceae
Alnipollenites verus
Alnipollenites verus Potonie 1931 birch
 Proteales - Proteaceae
Triporopollenites spp.
Triporopollenites spp. Pflug and Thomson 1953
 Mesangiosperms - Liliaceae
Liliacidites spp.
Liliacidites spp. Couper 1953