USGS core 1A, sample D6720-A (Paleocene of the United States)

Where: Sheridan County, Wyoming (44.8° N, 106.1° W)

• Paleocoordinates: 53.4° N, 71.5° 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)

• Smith 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 236893: authorized by Phillip Jardine, entered by Hannah Morck on 05.11.2024

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
unclassified
  -
Polyatriopollenites vermontensis
Magnoliopsida
  -
Ailanthipites cf. berryi
Angiospermae
 Fagales - Betulaceae
Alnus scoticus
unclassified
  -
Pistillipollenites mcgregorii
Angiospermae
 Cornales - Nyssaceae
Nyssa ingentipollinia
 Fagales - Betulaceae
Alnipollenites trina
 Mesangiosperms - Arecaceae
Arecipites cf. tenuiexinous
unclassified
  -
"Tricolporate A." indet., "Tricolpate/tricolporate" indet., Aesculiidites sp., "Bisaccate pollen" indet., "Tricolpate B." indet., Ulmipollenites "krempii/tricostatus"
Angiospermae
 Santalales - Loranthaceae
Syncolporites cf. minimus
unclassified
  -
"Tricolpate fine reticulum" indet.
Angiospermae
 Gunnerales -
Tricolpites hians
unclassified
  -
"Taxodiaceae/Cupressaceae" indet.
Angiospermae
 Buxales - Buxaceae
Erdtmanipollis pachysandroides
 Proteales -
Triatriopollenites granulatus
 Typhales - Commelinidae
Sparganium cf. globipites
unclassified
  -
Insulapollenites rugulatus
Angiospermae
 Fagales - Juglandaceae
Momipites wyomingensis, Caryapollenites imparalis, Caryapollenites veripites
Momipites wyomingensis Nichols and Ott 1978
Caryapollenites imparalis Nichols and Ott 1978
Caryapollenites veripites Wilson and Webster 1946
 Fagales - Fagaceae
Cupuliferoipollenites spp.
 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
Polypodiopsida
  - Gleicheniaceae
Gleicheniidites sp.
Gleicheniidites sp. Dettmann 1963
  - Polypodiaceae
Laevigatosporites spp.
Pteridopsida
  -
Leiotriletes spp.
Leiotriletes spp. Potonie and Kremp 1954
Ginkgoopsida
 Ephedrales -
Ephedripites spp.
Ephedripites spp. Bolkhovitina and Potonié 1958
Bryopsida
  -
Stereisporites spp.