Geology
Maricopa County, AZ
Approximate location — plotted from published sources, not a site visit, and not a guarantee of access.
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.
| Region | Maricopa County, AZ |
|---|---|
| Coordinates (approx.) | 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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Plan ahead. Leave no trace. Verify current access before traveling.