Oak Grove corehole, 70.4 m: Eocene, Virginia
collected by U.S. Army Corps of Engineers
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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Nudopollis terminalis microspore
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Pseudolaesopollis ventosa microspore
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informal Momipites-Plicatopollis-Platycaryapollenites spp. microspore
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Interpollis microsupplingensis microspore
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Magnoliopsida
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Favitricolporites baculoferus microspore
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Angiospermae
- Malvales
- Tiliaceae
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Intratriporopollenites pseudinstructus microspore
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Angiospermae
- Fagales
- Betulaceae
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Betula infrequens microspore
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Angiospermae
- Fagales
- Casuarinaceae
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Casuarinidites spp. microspore
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Angiospermae
- Fagales
- Juglandaceae
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Platycarya platycaryoides microspore
(Roche 1969)
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Momipites informal tenuipolus Group microspore
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Platycaryapollenites swasticoidus microspore
(Elsik 1974)
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Angiospermae
- Proteales
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Triatriopollenites triangulus microspore
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Triatriopollenites turgidus microspore
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Angiospermae
- Aquifoliales
- Aquifoliaceae
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Ilexpollenites spp. microspore
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unclassified
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Verrutricolporites spp. microspore
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| see common names | |||||||
Geography
| Country: | United States | State/province: | Virginia | County: | Westmoreland |
| Coordinates: | 38.2° North, 77.0° West (view map) | ||||
| Paleocoordinates: | 38.2° North, 64.8° West | ||||
| Basis of coordinate: | stated in text | ||||
| Geographic resolution: | hand sample |
Time
| Period: | Paleogene | Epoch: | Eocene |
| 10 m.y. bin: | Cenozoic 2-3 | ||
| Key time interval: | Eocene | ||
| Age range of interval: | 56.00000 - 33.90000 m.y. ago |
Stratigraphy
| Formation: | Nanjemoy | ||||
| Local section: | Oak Groce Corehole | Local bed: | 70.4 m | ||
| Local order: | top to bottom | ||||
| Stratigraphy comments: The wellhead was at an elevation of 54.85 m above sea level; depth refers to depths below the wellhead. | |||||
Lithology and environment
| Primary lithology: | green argillaceous sandstone |
| Secondary lithology: | claystone |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: The Nanjemoy Formation is composed of greensand and illitic clay that are strongly bioturbated. | |
| Environment: | offshore shelf |
| Geology comments: The Nanjemoy Formation is thought to have been deposited in open-marine shelf environments. | |
Taphonomy
| Modes of preservation: | body,original sporopollenin |
| Size of fossils: | microfossils |
| Temporal resolution: | time-averaged |
| Spatial resolution: | allochthonous |
Collection methods and comments
| Collection methods: | bulk,chemical,hydrochloric,hydroflouric,survey of museum collection |
| Reason for describing collection: | biostratigraphic analysis |
| Museum repositories: | USGS |
| Collectors: | U.S. Army Corps of Engineers |
| Collection method comments: 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. | |
Metadata
| Database number: | 233008 | ||
| Authorizer: | P. Jardine | Enterer: | H. Morck | Research group: | paleobotany |
| Created: | 2024-01-10 08:46:30 | Last modified: | 2024-01-10 08:46:30 |
| Access level: | the public | Released: | 2024-01-10 08:46:30 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 86806. | N. O. Frederiksen. 1979. Paleogene Sporomorph Biostratigraphy, Northeastern Virginia. Palynology 3:129-167 [P. Jardine/H. Morck] |