This Cache is an amateur radio APRScache, along with being an EarthCache, too. For ham radio operators, the geology portion of the cache is optional. To log the APRScache, simply log the location with your APRS-enabled radio at the EarthCache GPS coordinates. (Note: radio and cell service is very limited here; log the APRScache at the nearest site with reception).
Optionally, you can also log the EarthCache, which teaches more about the geology of the Columns of the Giants Geologic Site, Stanislaus National Forest, Tuolumne County, California. You will visit and learn more about the probable source of the lava flow, the age, and the likely fault zone that exists at the vent location. Then you will observe a dike and estimate its physical and geometric characteristics.
Here are the coordinates for the EarthCache on the Geocaching.com website:
"Columns of the Giants Fault Zone and Source"
| Cache name | APRScache/EarthCache: Columns of the Giants Fault Zone and Source |
| Hint | Park at the GPS coordinates and log the APRScache; then walk to, and log, the EarthCache. |
| Country | United States |
| Gridsquare | DM08CI41MR |
| Latitude | 38.340609 |
| Longitude | -119.795514 |
| Difficulty | Easy |
| Terrain | NOT suitable for small children |
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