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
| Region | Maricopa County, AZ |
|---|---|
| Coordinates | 33.8532, -112.3323 |
| Material | Thundereggs, geodes, agate/chalcedony nodules |
| Land | BLM public domain west of Lake Pleasant (verify parcel maps) |
| Type note | Campaign Maricopa rockhound cell → geology type |
| Vehicle | High-clearance / 4WD recommended on dirt approaches |
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