Forbes Shale

Short description: Geologic formation in the Sacramento Valley, California, USA

Forbes Shale
Stratigraphic range: Coniacian
~89.8–86.3 Ma

PreЄ

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 / 38.6; -122.0
Paleocoordinates|  [ ⚑ ] 42°48′N 86°30′W﻿ / ﻿42.8°N 86.5°W﻿ / 42.8; -86.5
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]

## Contents

* 1 Fossil content
* 2 See also
* 3 References
* 3.1 Bibliography
* 4 Further reading

## 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. ↑ 1.0 1.1 Forbes Shale at Fossilworks.org
2. ↑ 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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