Ione Formation
| Ione Formation | |
|---|---|
| Stratigraphic range: Eocene | |
.jpg) A rock from the Ione Formation | |
| Type | Geologic formation |
| Underlies | Chico Formation (regionally) |
| Overlies | Martinez Formation (regionally) |
| Location | |
| Region | California |
| Country | United States |
The Ione Formation is an Eocene Epoch geologic formation in California.[1][2][3]
Geology
[edit]The formation regionally overlies the Martinez Formation and regionally underlies the Chico Formation.
History
[edit]The auriferous gravels accumulated on slope of Sierra Nevada during the Neocene Period, and at same time there was deposited in the gulf then occupying the Great Valley a sedimentary series consisting of clays and sands.
Description
[edit]It is usually overlain by a few feet of reddish Pleistocene gravel and rests on Chico formation. The strata form flat-topped hills, and consists of a succession of light-colored clays and white or yellowish-white sandstones. The largest development occurs south of American River.
See also
[edit]
References
[edit]- ↑ "Science". AAAS. doi:10.1126/science.40.1019.67. Retrieved 2026-02-07.
- ↑ "Type Region of the Ione Formation (Eocene), Central California: Stratigraphy, Paleogeography, and Relation to Auriferous Gravels". pubs.usgs.gov. Retrieved 2026-02-07.
- ↑ "Geolex — Ione publications". ngmdb.usgs.gov. Retrieved 2026-02-07.