Paul Calburn has a story about how he had to work to gain an access to the Freida thunderegg bed on the top of a ravine and how the new claim owner would bulldoze the upper part of the bed over the cliff without realizing that the upper part contains some of the best thunderggs! The bed is well-known for the light-blue agates with strong green moss inclusions and they don't come up often because of bulldozing mishap. Horizontal banding are present in the eggs. The only place I ever has seen those thundereggs is his collection housed in Mimbres Armory Museum in Deming, New Mexico.