| Orr Formation | |
|---|---|
| Stratigraphic range: Cambrian | |
 Stromatolitic limestone (Big Horse Limestone Member; Utah) | |
| Type | Geological formation |
| Sub-units | Big Horse Limestone Member |
| Thickness | 1,825 feet [1] |
| Location | |
| Region |  Utah |
| Country |  United States |
| Extent | House Range |
| Type section | |
| Named for | Orr Ridge |
| Named by | Charles D. Walcott [1] |
| Year defined | 1910 [1] |
The Orr Formation is a geologic formation in Utah. It preserves fossils dating back to the Cambrian period. [1]
The Eau Claire Formation is a geologic formation in the north central United States. It preserves trilobite fossils from the Cambrian Period.
The Rome Formation is a geologic formation in Alabama, Georgia, and Tennessee. It preserves fossils dating back to the Cambrian period.
The Kinzers Formation is a geologic formation in Pennsylvania. It preserves fossils dating back to the Cambrian Period.
The Conasauga Formation is a geologic formation in Georgia. It preserves fossils dating back to the Cambrian period.
The Jordan Sandstone is a geologic formation in Wisconsin. It preserves fossils dating back to the Cambrian period.
The Dotsero Formation is a geologic formation in Colorado. It preserves fossils dating back to the Cambrian period.
The Sawatch Formation is a geologic formation in eastern Colorado. It is a sedimentary sequence formed approximately 530 million years ago during a marine transgression. It preserves fossils dating back to the Cambrian period. It is composed of glauconitic and quartz-rich sandstone.
The Spence Shale is the middle member of the Langston Formation in southeastern Idaho and northeastern Utah. It is exposed in the Bear River Range, the Wasatch Range and the Wellsville Mountains. It is known for its abundant Cambrian trilobites and the preservation of Burgess Shale-type fossils.
The Langston Formation is a geologic formation in Idaho and Utah. It preserves fossils dating back to the Cambrian period. The formation is composed of bluish-gray limestone, weathering to a buff color, often with rounded edges.
The Nopah Formation is a geologic formation in Utah. It preserves fossils dating back to the Cambrian period.
The Notch Peak Formation is a geologic formation in Utah. It preserves fossils dating back to the Cambrian period.
The Pioche Formation is a geologic formation in Utah and Nevada. It preserves fossils dating back to the Cambrian period.
The Ute Limestone is a geologic formation in Utah. It preserves fossils dating back to the Cambrian period.
The Weeks Formation is a geologic formation in Utah. It preserves fossils dating back to the Cambrian period and more specifically the Guzhangian stage. Its upper part has yielded a diverse fauna dominated by trilobites and brachiopods, but also comprising various soft-bodied organisms, such as Falcatamacaris. As such, it is regarded as a Konservat-Lagerstätte.
The Chisholm Formation is a geologic formation in Utah. It preserves fossils dating back to the Cambrian period.
The Dunderberg Shale is a geologic formation in Nevada and Utah.
The Bonanza King Formation is a geologic formation in Nevada. It preserves fossils dating back to the Cambrian period.
The Carrara Formation is a geologic formation in Nevada. It preserves fossils dating back to the Cambrian period.
The Latham Shale is a geologic formation in California. It preserves fossils dating back to the Cambrian period.
The Swasey Limestone is a geologic formation in Utah. It preserves fossils dating back to the Cambrian period.
  | This article about a specific stratigraphic formation in Utah is a stub. You can help Wikipedia by expanding it. |
 | This article related to the Cambrian period is a stub. You can help Wikipedia by expanding it. |
