Forbes Shale
From Handwiki Short description: Geologic formation in the Sacramento Valley, California, USA
| Forbes Shale Stratigraphic range: Coniacian ~89.8–86.3 Ma PreЄ
Є
O
S
D
C
P
T
J
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|---|---|
| Type | Formation |
| Unit of | Asuncion Group |
| Underlies | Kione Sands |
| Overlies | Funks Shale |
| Thickness | 1,300 ft (400 m) |
| Lithology | |
| Primary | Shale |
| Location | |
| Coordinates | [ ⚑ ] : 38°36′N 122°00′W / 38.6°N 122.0°W |
| Paleocoordinates | [ ⚑ ] 42°48′N 86°30′W / 42.8°N 86.5°W |
| Region | California |
| Country |  United States |
| Extent | Sacramento Valley |
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The Forbes Shale is a geologic formation in the Sacramento Valley of northern California , United States . It is found in the Sutter Buttes area of Sutter County, California. It preserves fossils dating back to the Coniacian stage of the Late Cretaceous period.[1]
Fossil content
The following fossils were reported from the formation:[1][2]
- Bivalves
- Cladoceramus undulatoplicatus
- Glycymerita veatchii
- Inoceramus subundatus
- I. Inoceramus vancouverensis
- I. aff. chicoensis
- I. aff. klamathensis
- I. aff. whitneyi
- Parallelodon|Parallelodon (Nanonavis) brewerlanus
- Pseudomelania colusaensis
- Gastropods
- Bernaya (Protocypraea) kayei
- Biplica obliqua
- Dentalium (Entalis) whiteavesi
- Pseudomelania colusaensis
- Tessarolax distorta
- Volutoderma californica
- Ammonites
- Baculites chicoensis
- B. inornatus
- Desmophyllites diphylloides
- Eupachydiscus arbucklensis
- E. willgreeni
- Eutrephoceras campbelli
- Lytoceras (Gaudryceras) alamedense
- Nowakites dobbinsi
- N. rumseyensis
- Oxybeloceras petrolense
- Parapachydiscus cortinaensis
- Puzosia (Holcodiscoides) gorrilli
- Puzosia (Parapuzosia) arenaica
- Baculites sp.
- Canadoceras sp.
- Hauericeras sp.
See also
- Cretaceous California
- List of fossiliferous stratigraphic units in California
References
- ↑ 1.0 1.1 Forbes Shale at Fossilworks.org
- ↑ Anderson, 1958
Bibliography
- Anderson, F. M. 1958. Upper Cretaceous of the Pacific Coast. Geological Society of America Memoir 71. 1–378.
Further reading
- Google Books: The Sutter Buttes of California: A Study of Plio-Pleistocene Volcanism; Howel Williams, Garniss H. Curtis.
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Categories: [Geologic formations of California] [Coniacian Stage] [Shale formations of the United States]
↧ Download as ZWI file | Last modified: 11/07/2025 09:02:28 | 6 views
☰ Source: https://handwiki.org/wiki/Earth:Forbes_Shale | License: CC BY-SA 3.0
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