Bear Creek: Cretaceous - Tertiary, Montana
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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Selaginellites mirabilis n. sp. megaspore
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| cotype for sp. | ||||||||||
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Pinopsida
- Pinales
- Pinaceae
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Cedroxylon sp.
Kraus 1870
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| bordered pits on the radial walls of the tracheids | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Montana |
| Coordinates: | 45.0° North, 109.0° West (view map) | ||
| Paleocoordinates: | 52.3° North, 79.0° West | ||
| Basis of coordinate: | based on political unit | ||
| Geographic resolution: | local area |
Time
| *Period: | Cretaceous - Tertiary | *Epoch: | Late - Early |
| Key time interval: | Cretaceous - Tertiary | ||
| Age range of interval: | 145.00000 - 2.58000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Fort Union | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: The exact formation in which the coal beds of the is field belong appears to have been rahter difficult to determine, and for many years there has been considerable controversy over the stratigraphic position of the Fort Union formation, placing it in either the top of the Cretaceous or the base of the Tertiary. (In many localities the formation lies immediatley above the Cannonball member of the Lance formation.)
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Lithology and environment
| Primary lithology: | coal |
| Environment: | mire/swamp |
Taphonomy
| Modes of preservation: | charcoalification,coalified,original sporopollenin |
| Size of fossils: | microfossils |
Collection methods and comments
| Collection methods: | surface (in situ),chemical,field collection |
| Reason for describing collection: | general faunal/floral analysis |
| Collection method comments: This collection was secured from Mr. W. H. Homer, operator of the Homer Coal Mining Company at Bear Creek Montana. Coal vein No. 4. | |
| Taxonomic list comments:The plant remains from the Cascade coal consisted mostly of cuticles and a few spores. The Carbon County sample contained some very interesting and characteristic megaspores, a few pieces of fairly well preserved charcoal, and some cuticles. The plant remains in the Cascade coal appeared to have undergone more distintegration than those in the other sample. | |
Metadata
| Also known as: | Bear Creek coal field or Red Lodge coal field, Carbon County, Montana (Fort Union Formation) | ||
| Database number: | 32513 | ||
| Authorizer: | R. Lupia | Enterer: | T. Naeher |
| Modifier: | T. Naeher | Research group: | paleobotany |
| Created: | 2003-07-07 15:16:15 | Last modified: | 2003-07-09 10:51:32 |
| Access level: | the public | Released: | 2003-07-07 15:16:15 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 8768. | E. L. Miner. 1935. Paleobotanical Examinations of Cretaceous and Tertiary Coals: II. Cretaceous and Tertiary Coals from Montana. The American Midland Naturalist 16(4):616-625 [R. Lupia/T. Naeher/T. Naeher] |