USGS Loc. 24241, Matanuska Valley-Nelchina [Matanuska Fm]: Campanian, Alaska
collected by Williams 1952
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bivalvia
- Myalinida
- Inoceramidae
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Inoceramus cf. subundatus
Meek 1861
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Cephalopoda
- Ammonitida
- Pachydiscidae
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Pachydiscus (Pachydiscus) kamishakensis
Jones 1963
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| see common names | |||||||
Geography
| Country: | United States | State/province: | Alaska | County: | Matanuska-Susitna |
| Coordinates: | 62.5° North, 150.0° West (view map) | ||||
| Paleocoordinates: | 71.4° North, 103.4° West | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
| Stage: | Campanian | 10 m.y. bin: | Cretaceous 7 |
| Key time interval: | Campanian | ||
| Age range of interval: | 83.60000 - 72.10000 m.y. ago |
Stratigraphy
| Formation: | Matanuska | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: STRATIGRAPHIC RELATIONS: From the Matanuska Fm, which unconformably overlie Early Cretaceous strata, including the Nelchina Limestone. AGE: Late Campanian or Maastrichtian, on the basis of ammonite biostratigraphy; Pachydiscus kamishakensis zone. STRATIGRAPHIC POSITION: From upper part of member 3, Matanuska Fm. | |||||
Lithology and environment
| Primary lithology: | lithified siltstone |
| Secondary lithology: | lithified "shale" |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: SPECIFIC LITHOLOGY: Siltstone and shale. LITHIFICATION: Lithified, on the basis of figured specimens. | |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | mold/impression |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection excludes: | some macrofossils | ||
| Collection methods: | surface (in situ),field collection | ||
| Reason for describing collection: | taxonomic analysis | ||
| Museum repositories: | USNM | ||
| Collectors: | Williams | Collection dates: | 1952 |
| Collection method comments: COLLECTOR: J. R. Williams, 1952. REPOSITORY: USNM. | |||
| Taxonomic list comments:COVERAGE: Exhaustive for ammonoids and bivalves. NOMENCLATURE: Authoritative publication, with slightly antiquated nomenclature, but with species-resolution identifications. | |||
Metadata
| Database number: | 88821 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2009-04-21 20:55:31 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | the public | Released: | 2009-04-21 20:55:31 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 18417. | D. L. Jones. 1963. Upper Cretaceous (Campanian and Maestrichtian) ammonites from southern Alaska. United States Geological Survey Professional Paper 432:1-53 [L. Ivany/L. Ivany/M. Clapham] |