// Workers AI · dad joke modeWhat did the Siesta Formation say? "I'm a rock solid sleeper.
| Siesta Formation | |
|---|---|
| Stratigraphic range: Neogene | |
| Type | Formation |
| Unit of | Contra Costa Group |
| Underlies | Bald Peak Formation |
| Overlies | Moraga Formation |
| Location | |
| Region | California |
| Country | United States |
The Siesta Formation is a geologic formation in California. It preserves fossils dating back to the Neogene period.
This formation overlies the Moraga Formation and underlies the Bald Peak Formation in the Berkeley Hills. It consists of lacustrine, claystone, siltstone, sandstone, tuff, and limestone deposited in a lake environment.[1] The formation is exposed in the syncline-formed Siesta Valley near Orinda where Route 24 crosses.[2]
See also
[edit]
References
[edit]- ↑ Gerasimov, Stacey H.; Hodgin, Eben B.; Crowley, James L.; Swanson-Hysell, Nicholas L. (1 February 2024). "Chronostratigraphy of Miocene strata in the Berkeley Hills (California Coast Ranges, USA) and the arrival of the San Andreas transform boundary". Geosphere. 20 (1): 162–178. doi:10.1130/GES02650.1.
- ↑ "Siesta Valley". Oakland Geology. 26 June 2008. Retrieved 3 July 2026.
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
 | This article about a specific stratigraphic formation in California is a stub. You can help Wikipedia by adding missing information. |