USGS #15530 - Pittsburg Bluff Formation: Chattian, Oregon
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bivalvia
- Nuculanida
- Nuculanidae
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Litorhadia washingtoni
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Bivalvia
- Nuculida
- Nuculidae
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Acila (Truncacila) shumardi
(Dall 1909)
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Bivalvia
- Cardiida
- Veneridae
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Callista (Macrocallista) pittsburgensis
(Dall 1900)
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| original and current combination Meretrix pittsburgensis | |||||||
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Bivalvia
- Cardiida
- Tellinidae
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? Tellina pittsburgensis
Clark 1925
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Bivalvia
- Cardiida
- Cardiidae
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Nemocardium (Keenae) lorenzanum
(Arnold 1908)
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| recombined as Nemocardium (Nemocardium) lorenzanum | |||||||
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Scaphopoda
- Dentaliida
- Dentaliidae
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Dentalium (? Fissidentalium) laneensis
Hickman 1969
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Gastropoda
- Turritellidae
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Turritella pittsburgensis
Moore 1976
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Gastropoda
- Neogastropoda
- Drilliidae
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Suavodrillia winlockensis
(Effinger 1938)
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| see common names | |||||||
Geography
| Country: | United States | State/province: | Oregon | County: | Columbia |
| Coordinates: | 45.9° North, 123.1° West (view map) | ||||
| Paleocoordinates: | 45.5° North, 114.2° West | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Paleogene | Epoch: | Oligocene |
| Stage: | Chattian | 10 m.y. bin: | Cenozoic 4 |
| Key time interval: | Chattian | ||
| Age range of interval: | 27.82000 - 23.03000 m.y. ago |
Stratigraphy
| Formation: | Pittsburg Bluff | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Upper part of Pittsburg Fm. The Pittsburg Bluff Formation conformably overlies the Keasey Formation (late Eocene and early Oligocene) and is conformably overlain by the Scappose Formation (late Oligocene and early Miocene). Parts of the formation are lithologically similar and therefore the stratigraphic position of exposures are sometimes uncertain. The estimated thickness for the entire formation is 200 ml the thickest continuous section of the formation is 100 m thick. | |||||
Lithology and environment
| Primary lithology: | "cross stratification",fine,concretionary,gray poorly lithified sandstone | ||
| Includes fossils? | Y | ||
| Lithology description: Massive olive-gray fine-grained sandstone, with concretions, trough shaped prisms, silstone rip-up clasts. | |||
| Environment: | offshore | Tectonic setting: | forearc basin |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
| Temporal resolution: | time-averaged |
| Spatial resolution: | allochthonous |
Collection methods and comments
| Collection excludes: | some macrofossils |
| Collection methods: | selective quarrying,field collection |
| Reason for describing collection: | taxonomic analysis |
| Museum repositories: | USGS |
| Collection method comments: Material housed in the USGS, Menlo Park. Also collections from UCMP, CAS, Stanford University (SU), University of Washington (UW), University of Oregon (UO), and the Academy of Natural Sciences of Philadelphia (ANSP) | |
| Taxonomic list comments:Very complete for mollusca. | |
Metadata
| Also known as: | USGS 15530 | ||
| Database number: | 37681 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2004-03-20 16:36:50 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | the public | Released: | 2004-03-20 16:36:50 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 10064. | E. J. Moore. 1976. Oligocene marine mollusks from the Pittsburg Bluff Formation in Oregon. United States Geological Survey Professional Paper 922:1-66 [A. Miller/A. Hendy/P. Wagner] |