Green Springs Mt.: Agate Nodule & Carnelian Rockhounding in Jackson County, Oregon

Plan your visit

Permission required before collecting

County

Jackson County

State

Oregon

Nearest road

32-3-32.1

Coordinates

42.13169, -122.51044

Coordinates are approximate. Confirm the exact ground in the RockHoundR app, where land overlays show which agency manages the area.

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.

Best time to visit Green Springs Mt.

Comfortable months (45 to 90°F highs)

Best months: April to October. Typical highs run 79°F in midsummer and 36°F in midwinter, with winter lows near 23°F.

Climate normals: NOAA 1991-2020 monthlies, HOWARD PRAIRIE DAM station (9 mi away).

Geology at Green Springs Mt.

This spot sits on Little Butte Volcanics; Roxy Formation, mapped as andesite flows, gray, basalt flows, gray; coarse to fine, plagioclase phenocrysts; zones: locally vesicular, and basaltic andesite flows that formed roughly 34 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

Little Butte Volcanics; Roxy Formation

Age

34–5 Ma (Oligocene to Miocene)

Rock types

andesite flows, gray, basalt flows, gray; coarse to fine, plagioclase phenocrysts; zones: locally vesicular, and basaltic andesite flows

Elevation

4,650 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.

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: April 1, 2026

• 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