Morrison of Great Falls-Lewistown: Kimmeridgian - Tithonian, Montana
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Amphibia
- Temnospondyli
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Nilssonia sp.
(Brongniart 1825)
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Cladophlebis cf. virginiensis
Fontaine 1889
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Amphibia
- Temnospondyli
- Cyatheaceae
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Coniopteris cf. bella
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Actinopteri
- Araucariaceae
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Pagiophyllum sp.
Heer 1881
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Actinopteri
- Bennettitales
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Zamites sp.
Brongniart 1828
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Actinopteri
- Coniferales
- Podocarpaceae
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Podozamites cf. lanceolatus
(Lindley and Hutton 1840)
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Actinopteri
- Coniferales
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Athrotaxites cf. berryi
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| see common names | |||||||
Geography
| Country: | United States | State/province: | Montana |
| Coordinates: | 47.1° North, 110.1° West (view map) | ||
| Paleocoordinates: | 43.1° North, 54.5° West | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | local area |
Time
| Period: | Jurassic | Epoch: | Late Jurassic |
| Stage: | Kimmeridgian - Tithonian | 10 m.y. bin: | Jurassic 5 - Jurassic 6 |
| *Period: | Late/Upper Jurassic | ||
| Key time interval: | Kimmeridgian - Tithonian | ||
| Age range of interval: | 154.8 - 145 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Morrison | ||||
| Stratigraphic resolution: | formation | ||||
| Stratigraphy comments: coal located within 15 feet of the top of the Morrison Formation | |||||
Lithology and environment
| Primary lithology: | black,green "shale" |
| Secondary lithology: | gray sandy,carbonaceous siltstone |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: medium to dark-gray carbonaceous shale containing coal and lenses of fine-grained sandstone. | |
| Environment: | fluvial-lacustrine indet. |
Taphonomy
| Modes of preservation: | adpression |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection excludes: | some macrofossils,difficult macrofossils |
| Collection methods: | selective quarrying,surface (float),surface (in situ),mechanical,field collection |
| Reason for describing collection: | biostratigraphic analysis |
Metadata
| Database number: | 24670 | ||
| Authorizer: | A. Rees | Enterer: | D. Sunderlin |
| Modifier: | M. Carrano | Research group: | paleobotany |
| Created: | 2002-08-15 09:14:45 | Last modified: | 2021-08-19 14:55:15 |
| Access level: | the public | Released: | 2002-08-15 09:14:45 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 6934. | PGAP | A. J. Silverman and W. L. Harris. 1967. Stratigraphy and economic geology of the Great Falls-Lewistown coal field central Montana. State of Montana Bureau of Mines and Geology Bulletin 56 1-20 [A. Rees/D. Sunderlin/D. Sunderlin] |