Al Rose Formation
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| 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] |
The Al Rose Formation is a geologic formation located in Inyo County, California. It is notable for preserving fossils from the Cambrian Period, offering insights into early Paleozoic life and environments.[4]
The formation is primarily composed of shale, with interbedded limestone and sandstone layers, indicating a range of depositional environments. These rocks were deposited in a marine setting, as evidenced by their fossil content and sedimentary structures.[5] The formation is stratigraphically positioned within the Great Basin region, an area renowned for its well-preserved Cambrian stratigraphy.[6]
Fossil Content
Fossils recovered from the formation include a variety of trilobites, brachiopods, and archaeocyathids, providing critical data on the diversity of life during the Cambrian explosion.[7] These fossils help paleontologists reconstruct ancient ecosystems and understand evolutionary dynamics during the Cambrian.
