USGS locality D6768 (Paleocene of the United States)

Where: Powder River County, Montana (46.6° N, 105.7° W: paleocoordinates 52.2° N, 83.2° W)

• coordinate estimated from map

• hand sample-level geographic resolution

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

• O'Dell-Cache 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 more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 236816: 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
unclassified
  -
"Tricolporate A." indet.
Angiospermae
 Fagales - Betulaceae
Alnipollenites trina
 Malvales - Tiliaceae
Tilia tetraforaminipites
 Fagales - Fagaceae
Quercus explanata
unclassified
  -
"Tricolpate A." indet., Polyatriopollenites vermontensis
Angiospermae
 Cornales - Nyssaceae
Nyssa ingentipollinia
unclassified
  -
Ulmipollenites "krempii/tricostatus", "Tricolpate/tricolporate" indet.
Angiospermae
 Gunnerales -
Tricolpites hians
unclassified
  -
"Bisaccate pollen" indet., "Taxodiaceae/Cupressaceae" indet., "Tricolpate B." indet.
Angiospermae
 Proteales -
Triatriopollenites granulatus
unclassified
  -
Aesculiidites sp.
Pteridopsida
  -
Reticuloidosporites pseudomurii
unclassified
  -
"Tricolporate B." indet., Insulapollenites rugulatus
Angiospermae
 Buxales - Buxaceae
Erdtmanipollis pachysandroides
 Santalales - Loranthaceae
Syncolporites cf. minimus
unclassified
  -
Pistillipollenites mcgregorii
Equisetopsida
 Pinidae - Pinidae
"Corollina sp." = Classopollis
"Corollina sp." = Classopollis Pflug 1953
Pteridopsida
  -
Leiotriletes spp.
Leiotriletes spp. Potonie and Kremp 1954
Polypodiopsida
  - Polypodiaceae
Laevigatosporites spp.
Bryopsida
  -
Stereisporites spp.
Angiospermae
 Fagales - Betulaceae
Alnipollenites verus
Alnipollenites verus Potonie 1931 birch
 Fagales - Fagaceae
Cupuliferoipollenites spp.
 Fagales - Juglandaceae
Caryapollenites imparalis, Caryapollenites wodehousei, Caryapollenites veripites, Momipites wyomingensis, Momipites waltmanensis, Momipites ventifluminis
Caryapollenites imparalis Nichols and Ott 1978
Caryapollenites wodehousei Nichols and Ott 1978
Caryapollenites veripites Wilson and Webster 1946
Momipites wyomingensis Nichols and Ott 1978
Momipites waltmanensis Nichols and Ott 1978
Momipites ventifluminis Nichols and Ott 1978
 Proteales - Proteaceae
Triporopollenites spp.
Triporopollenites spp. Pflug and Thomson 1953
 Mesangiosperms - Liliaceae
Liliacidites spp.
Liliacidites spp. Couper 1953