Jacolitos Canyon: Fossil Hunting in Fresno County, California

Plan your visit

Generally open to casual rockhounding

County

Fresno County

State

California

Nearest road

Jacalitos Creek Road

Coordinates

36.09618, -120.32039

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

Land & collecting status

Generally open to casual rockhounding

Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig.

Access note: Use public BLM or other lawful access only, because western Fresno County includes private ranch land and conservation easements. Avoid vertebrate fossil collection and confirm current land status before collecting.

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 Jacolitos Canyon

Comfortable months (45 to 90°F highs)

Best months: October to May. Typical highs run 101°F in midsummer and 60°F in midwinter, with winter lows near 38°F. Summer heat here is intense, so carry more water than you think you need and work the early morning.

Climate normals: NOAA 1991-2020 monthlies, COALINGA station (4 mi away).

Geology at Jacolitos Canyon

This spot sits on alluvium and marine deposits, mapped as coarse alluvium that formed within roughly the last 5 million years. Reworked sediments like these can carry fossils eroded from older beds upstream, typically as rolled bone fragments, teeth, and shell material.

Mapped unit

alluvium and marine deposits

Age

5 Ma to present (Pliocene to Holocene)

Rock types

coarse alluvium

Elevation

690 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 California, Recreational mineral collecting
• California Geological Survey
• CDFW, Suction Dredge Mining Permit Program
• Community submissions reviewed against published agency rules