| Jalama Formation | |
|---|---|
| Stratigraphic range: Late Cretaceous | |
 Dark shale beds of the Jalama Formation on the Santa Ynez Mountain crest north of Montecito, California. These beds are overturned; "up" is down and to the left. | |
| Type | Sedimentary |
| Underlies | Juncal Formation, Sierra Blanca Limestone |
| Overlies | Espada Formation, Franciscan Formation[1] |
| Thickness | 2000-4000 feet[2][3] |
| Lithology | |
| Primary | Shale, sandstone |
| Location | |
| Region | Coastal and interior Santa Barbara County, California |
| Country | United States |
| Type section | |
| Named for | Jalama Creek[2] |
| Named by | Dibblee (1950)[2] |
The Jalama Formation is a sedimentary rock formation widespread in southern Santa Barbara County and northern Ventura County, southern California. Of the Late Cretaceous epoch, the unit consists predominantly of clay shale with some beds of sandstone.
A particularly erosion-resistant sandstone within the unit forms the scenic Nojoqui Falls, in the Santa Ynez Mountains south of Solvang.
- ^ Dibblee, Thomas. Geology of the central Santa Ynez Mountains, Santa Barbara County, California. Bulletin 186, California Division of Mines and Geology. San Francisco, 1966. 21
- ^ a b c Dibblee, Thomas. Geology of Southwestern Santa Barbara County, California. Bulletin 150, California Division of Mines and Geology. San Francisco, 1950. 23
- ^ Dibblee (1966) 21-22