USNM 14079, Section 6: Clarkforkian, North Dakota
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Polypodiopsida
- Polypodiales
- Onocleaceae
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Onoclea hesperia leaf
Hickey 1977
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3 specimens | ||||||
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Polypodiopsida
- Osmundaceae
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Osmunda macrophylla leaf
Penhallow 1908
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2 specimens | ||||||
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Angiospermae
- Saxifragales
- Cercidiphyllaceae
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Cercidiphyllum genetrix leaf
(Newberry 1868)
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5 specimens | ||||||
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Angiospermae
- Ranunculales
- Menispermaceae
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"Cocculus" flabella leaf
Wolfe 1966
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1 specimen | ||||||
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Angiospermae
- Proteales
- Sabiaceae
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Meliosma longifolia leaf
(Hickey 1977)
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13 specimens | ||||||
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Angiospermae
- Laurales
- Lauraceae
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Persites argutus n. gen., n. sp. leaf
Hickey 1977
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4 specimens | ||||||
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Magnoliopsida
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Dicotylophyllum anomalum leaf
(Ward 1887)
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1 specimen | ||||||
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Coniferales
- Cupressaceae
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Metasequoia occidentalis axis, leaf
Chaney 1951
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14 specimens | ||||||
| see common names | |||||||
Geography
| Country: | United States | State/province: | North Dakota | County: | Morton |
| Coordinates: | 47.0° North, 102.1° West (view map) | ||||
| Paleocoordinates: | 51.3° North, 82.0° West | ||||
| Basis of coordinate: | estimated from map | ||||
| Geographic resolution: | small collection |
Time
| Period: | Paleogene | ||
| 10 m.y. bin: | Cenozoic 1-2 | ||
| *Period: | Early/Lower Tertiary - Middle Tertiary | *Epoch: | Paleocene | *Local age/stage: | Clarkforkian |
| Key time interval: | Clarkforkian | ||
| Age range of interval: | 56.2 - 54.9 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Golden Valley | Member: | Bear Den |
| Regional section: | Williston |
| Stratigraphic resolution: | bed |
Lithology and environment
| Primary lithology: | conglomeratic siltstone |
| Secondary lithology: | "shale" |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: Dominantly interchannel siltstone and shale, conglomeritic | |
| Environment: | "channel" |
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: | 45 specimens |
| Reason for describing collection: | paleoecologic analysis |
| Museum repositories: | USNM |
Metadata
| Database number: | 10968 | ||
| Authorizer: | H. Sims | Enterer: | S. Ostrowski |
| Modifier: | C. Visaggi | Research group: | paleobotany |
| Created: | 2001-07-08 18:15:45 | Last modified: | 2004-03-11 16:25:10 |
| Access level: | the public | Released: | 2001-07-08 18:15:45 |
| 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] |