Coldwater Sandstone
The Coldwater Sandstone (or Coldwater Formation) is a sedimentary geologic unit of Eocene age found in Southern California, primarily in and south of the Santa Ynez Mountains of Santa Barbara County, and east into Ventura County. It consists primarily of massive arkosic sandstone with some siltstone and shale. Being exceptionally resistant to erosion, outcrops of the Coldwater form some of the most dramatic terrain on the south slope of the Santa Ynez Mountains, with immense white sculpted slabs forming peaks, hogback ridges, and sheer cliff faces.: 32–33
| Coldwater Sandstone | |
|---|---|
| Stratigraphic range: Mid-Late Eocene | |
Coldwater Sandstone, Santa Ynez Mountains, north of Santa Barbara, California | |
| Type | sedimentary |
| Underlies | Sespe Formation |
| Overlies | Cozy Dell Shale |
| Thickness | 0 to 3200 feet: 16, 32 |
| Lithology | |
| Primary | sandstone |
| Other | siltstone, mudstone, occasional conglomerates |
| Location | |
| Region | Southern California |
| Country | United States |
| Type section | |
| Named for | Coldwater Canyon, tributary of the Sespe River, north of Fillmore |
| Named by | Watts(1896) |
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