A History of Rockhounding in Central Oregon
Central Oregon
has a storied history as one of the world's premier rockhounding destinations, deeply rooted in its 50-million-year timeline of volcanic activity. The region, particularly Crook County, is often celebrated as the "Rockhound Capital of the World" due to its incredible abundance of semi-precious gems and minerals.
Geological Foundations
The history of Central Oregon's rocks began millions of years ago when superheated groundwater circulated through volcanic layers, filling voids with minerals like quartz, agate, and jasper.
The Thunderegg:
In 1965, the thunderegg was designated as the official Oregon State Rock. These agate-filled nodules are among the most coveted finds for local rockhounds.
Glass Buttes:
Formed approximately 4.9 million years ago, this area became legendary for its massive deposits of obsidian, including rare gold sheen, rainbow, and midnight lace varieties.
Historic Landmarks & Sites
The hobby has been a mainstay of Oregonian culture for decades, leading to the creation of unique local landmarks and famous commercial digging sites.
Petersen Rock Garden:
Founded in 1935 by Danish immigrant Rasmus Petersen, this 4-acre landmark features miniature buildings constructed entirely from local rocks, minerals, and thundereggs.
Crook County Sites:
Prineville has long served as the gateway to historic public digging areas like Maury Mountain, White Fir, and Bear Creek, which remain popular for their plume agates and petrified wood.
Community and Culture
Rockhounding in the region evolved from a niche interest into a structured community through clubs and annual events.
Central Oregon Rock Collectors (CORC):
This long-standing club connects enthusiasts across the region to share tips and locations.
Rockhound Pow Wow:
Prineville hosts an annual Rockhound Pow Wow at the Carey Foster Hall, a tradition that includes field trips, jewelry raffles, and displays of rare local specimens.