F85 - Silverado Formation, Santa Ana Mountains: Thanetian, California
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda
- Neogastropoda
- Clavatulidae
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"Turricula" sp.
Schumacher 1817
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Gastropoda
- Neogastropoda
- Buccinidae
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? Brachysphingus sp.
Gabb 1869
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Gastropoda
- Ficidae
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Ficopsis sp.
Conrad 1866
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synonym of Ficus | ||||||||||
Gastropoda
- Turritellidae
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Turritella pachecoensis
Stanton 1896
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Bivalvia
- Carditida
- Crassatellidae
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Crassatella informal n. sp. A
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Bivalvia
- Arcida
- Glycymerididae
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Glycymeris cf. veatchii
(Gabb 1864)
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Subspecies: Glycymeris veatchii major | ||||||||||
= Glycymerita major
Stanton 1896
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Hendy 2020 | |||||||||
Bivalvia
- Arcida
- Cucullaeidae
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Cucullaea cf. mathewsoni
(Gabb 1864)
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original and current combination Cucullaea mathewsonii | ||||||||||
see common names |
Geography
Country: | United States | State/province: | California | County: | Orange |
Coordinates: | 33.9° North, 117.8° West (view map) | ||||
Paleocoordinates: | 37.5° North, 98.3° West | ||||
Basis of coordinate: | based on nearby landmark | ||||
Altitude: | 325 meters | ||||
Geographic resolution: | outcrop |
Time
Period: | Paleogene | Epoch: | Paleocene |
Stage: | Thanetian | 10 m.y. bin: | Cenozoic 1 |
Key time interval: | Thanetian | ||
Age range of interval: | 59.20000 - 56.00000 m.y. ago |
Stratigraphy
Formation: | Silverado | ||||
Local section: | Santa Ana Canyon Road | ||||
Regional section: | Los Angeles | ||||
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: The type section suggests a thickness of around 350 m for the Silverado Formation, which lies unconformably upon the Late Cretaceous Williams Formation and Ladd Formation, and is overlain unconformably by the Santiago Formaton. The Silverado Formation is given a Paleocene age on the basis of macrofauna (sparse index taxa), but more finely assigned by McCulloh et al. (2000) to the Martinez stage = Thanetian. Calcareous nannoplankton zone CP7-CP; Planktonic foraminifera zone P4-P5; Ynezian foram zone. The Silverado Formation is correlative to the lower-middle Santa Susana Formation. |
Lithology and environment
Primary lithology: | fine,medium sandstone |
Includes fossils? | Y |
Lithology description: Fine-medium grained sandstone | |
Environment: | marine indet. |
Glacial or sequence phase: | transgressive |
Geology comments: The contact below the Silverado Formation represents an episode of deformation and extensive erosion and deep weathering between the deposition of the late Cretaceous rocks and the Paleocene strata. |
Taphonomy
Modes of preservation: | body |
Size of fossils: | macrofossils |
Collection methods and comments
Collection methods: | selective quarrying,field collection,survey of museum collection |
Reason for describing collection: | biostratigraphic analysis |
Museum repositories: | USGS |
Collection method comments: Collected by J.E. Schoelhamer. Material likely to be reposited in USGS Menlo Park collections or USNM. | |
Taxonomic list comments:Fossils identified by Stewart (1954, 1955) and Moore (1959). Relatively good nomenclature |
Metadata
Also known as: | USGS #18982; Field #S101 | ||
Database number: | 52595 | ||
Authorizer: | A. Hendy | Enterer: | A. Hendy |
Modifier: | A. Hendy | Research group: | marine invertebrate |
Created: | 2005-08-11 20:59:35 | Last modified: | 2013-11-25 13:37:23 |
Access level: | the public | Released: | 2005-08-11 20:59:35 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
3060. | J. E. Schoellhamer, J. G. Vedder, R. F. Yerkes and D. M. Kinney. 1981. Geology of the Northern Santa Ana Mountains, California. United States Geological Survey Professional Paper 420(D):1-109 [J. Alroy/J. Alroy/R. McClees-Funinan] |
Secondary references:
63217 | A. J. W. Hendy. 2020. Unpublished taxonomic backbone for Eastern Pacific Invertebrate Communities of the Cenozoic (EPICC) Thematic Collections Network. [A. Hendy/A. Hendy/A. Hendy] |