Geology

Lake Pleasant Thunderegg Beds

Maricopa County, AZ

Coordinate unverified

Public-land volcanic washes west of Lake Pleasant known among rockhounds for thundereggs, gas-bubble geodes, and agate nodules weathered from Tertiary volcanics. Surface collecting of reasonable amounts is allowed on open BLM land; stay off county park, private, and claim ground.

Field facts

RegionMaricopa County, AZ
Coordinates33.8532, -112.3323
MaterialThundereggs, geodes, agate/chalcedony nodules
LandBLM public domain west of Lake Pleasant (verify parcel maps)
Type noteCampaign Maricopa rockhound cell → geology type
VehicleHigh-clearance / 4WD recommended on dirt approaches

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