Oak Grove corehole, 103.7 m (Paleocene of the United States)

Where: Westmoreland County, Virginia (38.2° N, 77.0° W: paleocoordinates 38.9° N, 56.7° W)

• coordinate stated in text

• hand sample-level geographic resolution

When: Aquia Formation, Paleocene (66.0 - 56.0 Ma)

• The wellhead was at an elevation of 54.85 m above sea level; depth refers to depths below the wellhead.

Environment/lithology: marine; green sandstone

• The boundary between the Aquia Formation and the Malboro Clay is gradational between 103.7 and 103.6 m. The lower part of this interval consists of Aquia greensand containing clasts of Malboro-like clay; this greensand grades upward into reddish-brown clay containing laminae of greensand.

Size class: microfossils

Preservation: original sporopollenin

Collected by U.S. Army Corps of Engineers; reposited in the USGS

Collection methods: bulk, chemical, hydrochloric, hydroflouric,

• Stratigraphic test bored by the U.S. Army Corps of Engineers, under contract to the U.S. Geological Survey, in 1976. Samples were prepared by means of standard acid maceration as well as by swirling and (or) ZnBr2 separation. Specimens are located at the U.S. Geological Survey, Reston, Virginia.

Primary reference: N. O. Frederiksen. 1979. Paleogene Sporomorph Biostratigraphy, Northeastern Virginia. Palynology 3:129-167 [P. Jardine/H. Morck]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 233019: authorized by Phillip Jardine, entered by Hannah Morck on 10.01.2024

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Magnoliopsida
  -
Angiospermae
 Malvales - Tiliaceae
 Fagales - Casuarinaceae
Casuarinidites spp. Cookson and Pike 1954
 Fagales - Betulaceae
 Fagales - Juglandaceae
Carya "less than 29 µm" Nuttall 1818 hickory
Dicotyledoneae
 Myrtales - Onagraceae
Corsinipollenites sp. Nakoman 1965 willowherb
Angiospermae
 Gunnerales -
 Poales - Restionaceae
Lusatisporis
  -
Trudopollis
  -