Nogales Ranger District
Sycamore Canyon offers a high number of plants and animals with disjunct distributions or at the edge of their range. Also intriguing is Onyx Cave, a series of passageways and rooms that honeycomb an outcropping of rock in the Santa Rita Mountains. Limestone, the rock from which the cave was carved, is made of the shells of tiny sea creatures deposited in layers over a vast period of time. Eventually, geological forces deformed and cracked the limestone. Water entered these cracks and gradually enlarged them into what is now known as Onyx Cave.

Permit Information
No permit needed.

Directions
From US 10 head south on State Highway 186.

Information Center
The Cave Creek Visitor Center in this district is located off the Rodeo exit on US 80.

Activities