| Hosselkus Limestone | |
|---|---|
| Stratigraphic range: Late Triassic, | |
 Weathered portions of the Hosselkus Limestone | |
| Type | Geological formation |
| Thickness | up to 140 feet (40 m) |
| Lithology | |
| Primary | Limestone |
| Other | granite, slate, sandstone |
| Location | |
| Coordinates | 40°04′N 120°43′W / 40.06°N 120.72°W |
| Region |  California |
| Country | United States |
| Type section | |
| Named for | Hosselkus Creek, Plumas County, California |
| Named by | Diller, J. S. |
| Year defined | 1892 |
The Hosselkus Limestone is an Upper Triassic fossiliferous marine micritic limestone formation that outcrops in Plumas and Shasta Counties, California.[1] It is known for its invertebrate fauna, most notably the many species of shelled cephalopods.
- ^ Noble, Paula; Paul Renne (March 1990). "Paleoenvironmental and biostratigraphic significance of siliceous microfossils of the Permo-Triassic Redding Section, Eastern Klamath Mountains, California". Marine Micropaleontology. 15 (3–4): 379–391. Bibcode:1990MarMP..15..379N. doi:10.1016/0377-8398(90)90021-D.