Onyx Cave
Onyx Cave is a solutional cave system with about of passages formed in Permian limestone in the Santa Rita Mountains of Arizona. It is part of the Coronado National Forest. It was designated a National Natural Landmark in 1974.
Details
- Access
- Gated
- Length
- 0.5 mi
- Geology
- Permian limestone
- Location
- Santa Rita Mountains, Santa Cruz County, Arizona
- Entrance Count
- 1