North of Lost Bridge (USNM 14121): Wasatchian, North Dakota
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Angiospermae
- Oxalidales
- Oxalidaceae
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Averrhoites affinis leaf
(Newberry 1868)
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9 specimens | ||||||
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Angiospermae
- Fagales
- Betulaceae
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Corylus acutertiaria leaf
Hickey 1977
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102 specimens | ||||||
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Angiospermae
- Laurales
- Lauraceae
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Persites argutus leaf
Hickey 1977
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15 specimens | ||||||
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Angiospermae
- Ericales
- Ericaceae
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"Kalmia" elliptica leaf
Brown 1962
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1 specimen | ||||||
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Coniferales
- Cupressaceae
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Thuites interruptus axis, leaf
Bell 1949
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5 specimens | ||||||
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Metasequoia occidentalis axis, leaf
Chaney 1951
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4 specimens | ||||||
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Polypodiopsida
- Blechnaceae
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Woodwardia gravida n. sp. leaf, microspore
Hickey 1977
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1 specimen | ||||||
| see common names | |||||||
Geography
| Country: | United States | State/province: | North Dakota | County: | Dunn |
| Coordinates: | 47.6° North, 102.8° West (view map) | ||||
| Paleocoordinates: | 51.6° North, 84.2° West | ||||
| Basis of coordinate: | estimated from map | ||||
| Geographic resolution: | small collection |
Time
| Period: | Paleogene | Epoch: | Eocene |
| Stage: | Ypresian | 10 m.y. bin: | Cenozoic 2 |
| *Period: | Early/Lower Tertiary - Middle Tertiary | *Local age/stage: | Wasatchian |
| Key time interval: | Wasatchian | ||
| Age range of interval: | 54.9 - 50.5 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Golden Valley | Member: | Bear Den |
| Regional section: | Williston | Regional bed: | Williston |
| Stratigraphic resolution: | bed |
Lithology and environment
| Primary lithology: | sandstone |
| Secondary lithology: | "shale" |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: Sandstone; dominantly interchannel shale/siltstone; dominantly Lacustrine siltstone | |
| Environment: | "channel" |
| Geology comments: Dominantly interchannel sandstone and shale, conglomeritic; lignite; dominantly Lacustrine siltstone | |
Taphonomy
| Modes of preservation: | adpression |
| Size of fossils: | macrofossils |
| Preservation of anatomical detail: | good |
| Temporal resolution: | snapshot |
| Spatial resolution: | parautochthonous |
Collection methods and comments
| Collection methods: | selective quarrying,field collection |
| Collection size: | 137 specimens |
| Reason for describing collection: | paleoecologic analysis |
| Museum repositories: | USNM |
Metadata
| Database number: | 10979 | ||
| Authorizer: | H. Sims | Enterer: | S. Ostrowski, J. Cassara |
| Modifier: | G. Varnham | Research group: | paleobotany |
| Created: | 2001-07-08 22:08:50 | Last modified: | 2022-03-23 05:38:15 |
| Access level: | the public | Released: | 2001-07-08 22:08:50 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 4023. | ETE 425 | L. J. Hickey. 1977. Stratigraphy and paleobotany of the Golden Valley Formation (Early Tertiary) of western North Dakota. The Geological Society of America Memoir 150:1-183 [H. Sims/S. Ostrowski/J. Cassara] |