The Al Rose Formation is a geologic formation in California. It consists mostly of siltstone, mudstone and shale, with some chert and occasional limestone. In it are found graptolite and trilobite fossils dating back to the Ordovician period.[2]
| Al Rose Formation | |
|---|---|
| Stratigraphic range: Ordovician | |
| Type | Formation |
| Unit of | Mazourka Group[1] |
| Underlies | Badger Flat Limestone[1] |
| Lithology | |
| Primary | siltstone, mudstone, and shale[2] |
| Other | chert[2] |
| Location | |
| Region | Talc City Hills, California[3] |
| Country | United States |
| Type section | |
| Named for | Al Rose Canyon, Inyo County, California[1] |
| Named by | Donald Clarence Ross[1] |
See also
References
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