Orr Formation

The Orr Formation is a geologic formation in Utah. It preserves fossils dating back to the Cambrian period.^[1]

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]

See also

• Earth sciences portal
• Utah portal
• Paleontology portal

• List of fossiliferous stratigraphic units in Utah
• Paleontology in Utah