General Area: Nodules Filled With Opal Rockhounding in Morrow County, Oregon
Updated June 2026
General Area is a mapped rockhounding spot in Morrow County, Oregon. Reported finds include nodules filled with opal. Below: coordinates, access notes, nearby spots, and trip-planning links.
Map showing General Area in Morrow County, Oregon
Quick details
- Access
- Permission required
- County
- Morrow County
- State
- Oregon
- Nearest road
- Balm Fork Road
- Coordinates
- 45.32740, -119.51299
Geology at General Area
This spot sits on Columbia River Basalt Group; Grande Ronde Basalt; Normal magnetostratigraphic unit 2, mapped as basalt flows that formed roughly 23 to 5 million years ago. Volcanic ground like this is where agate, jasper, and other chalcedony typically form, filling old gas pockets and fracture seams in the flow rock.
- Mapped unit
- Columbia River Basalt Group; Grande Ronde Basalt; Normal magnetostratigraphic unit 2
- Age
- 23–5 Ma (Miocene)
- Rock types
- basalt flows
- Elevation
- 2,910 ft
Geologic mapping via Macrostrat and the underlying state geological survey maps (CC BY 4.0). Bedrock at the surface can vary within a mapped unit.
Best time to visit General Area
Best months: March to November. Typical highs run 83°F in midsummer and 40°F in midwinter, with winter lows near 24°F.
Climate normals: NOAA 1991-2020 monthlies, HEPPNER station (4 mi away), adjusted for elevation.
Land & collecting status
Permission required before collecting
Requires landowner or agency permission before any collecting. Do not enter without explicit authorization.
Public-land rules vary by agency, season, and field office. The RockHoundR app pulls live BLM, USFS, NPS, and tribal overlays so you can see exactly which agency manages the ground at this spot.
Sources & verification
Spot details combine the public RockHoundR location dataset, normalized mineral labels, agency land-status checks in the app, and community submissions. Coordinates are approximate until verified in the field.
State guidance last verified:
- BLM Oregon/Washington — Rockhounding & mineral material
- Oregon Department of Geology and Mineral Industries (DOGAMI)
- Oregon Parks and Recreation Department — beach collecting rules
- Community submissions reviewed against published agency rules
Found at General Area
Each chip opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.
Nearby rockhounding spots
Other rockhounding spots within driving distance of General Area.
- Opal ButteTop pick in OregonMorrow County, Oregon · 20 mi awayHyalite Opal
- Wheeler High School Fossil BedsWheeler County, Oregon · 41 mi awayFossils
- John Day River at Cottonwood Canyon State ParkGilliam County, Oregon · 46 mi awayAgate, Jasper, Petrified Wood
- John Day River & StreamsWasco County, Oregon · 57 mi awayFossilized Ferns
- John Day RiverGrant County, Oregon · 58 mi awayFossils, Petrified Wood
- Orofino Mine areaGrant County, Oregon · 65 mi awayAgate, Jasper, Gold
- AntelopeWasco County, Oregon · 66 mi awayAgate, Chalcedony, Geode
- AshwoodJefferson County, Oregon · 73 mi awayAgate, Chalcedony, Geode
Across the state line from General Area
General Area is close enough to the Oregon border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.
General Area FAQ
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More rockhounding in Oregon
See all 177 Oregon spots →Open General Area on the map
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